path: root/README

Mission
-------

Build a crosstool-ng toolchain for i486.

Use makepkg with patched PKGBUILDs for cross-compilation.

We cannot run tests this way, as we don't assume the i486
is running on x64_64 (which it does, but for the sake
of the general usage of the approach we MUST assume it
doesn't!).

Packages built for the chroot must be also accessible to
the cross-compiler (for header files, tools and libraries).
For this we unpack all generated chroot packages in the sysroot
of the toolchain.

x-tools and sysroot: the cross-compiler (cross-ng) and
the installed packages (using bsdtar) in the sysroot
of the toolchain.

i486-root destination root, being the boot image of the
temporary system for i486.

The goal is to get to a self-contained system with as
few packages as possible which allows a basic i486 to
be built. This requires at least some development tools,
pacman and some base system to be cross-compiled.

We also want basic network connetivity, so we can use
the i486 VMs or real i486 as build slaves. Also, having
a minimal bootable ISO for the i486 system (or even a
set of floppies or PXE boot via a boot floppy would
be very useful). We cannot have kernel modules in a 
ramdisk or systemd for this basic system because they
interfere heavily with memory constains on a 486! So,
we build up to an openssh server.

On top, the full Archlinux i486 universe can then be
built (either with a i486 chroot or via a i486 master/
distcc slaves setup or a distributed i486 cluster setup).

There is another caveat: we are patching the PKGBUILDs
to do proper cross-compilation (--with-host, --with-target).
Still we try to stay close to the original PKGBUILDs.

References
----------

https://archlinuxarm.org/wiki/Distcc_Cross-Compiling
https://wiki.archlinux.org/index.php/Cross-compiling_tools_package_guidelines
http://mgalgs.github.io/2011/12/08/creating-arch-linux-packages-by-hand.html
http://clfs.org/view/svn/ppc/chroot/before-chroot.html
http://www.linuxfromscratch.org/clfs/
https://www.dotslashlinux.com/2017/04/29/booting-the-linux-kernel-without-an-initrd-initramfs/
https://rubenerd.com/sata-on-qemu/
https://archlinuxarm.org/forum/viewtopic.php?f=57&t=6163
https://dustymabe.com/2012/12/15/mounting-a-partition-within-a-disk-image/
http://preshing.com/20141119/how-to-build-a-gcc-cross-compiler/
http://wiki.osdev.org/GCC_Cross-Compiler
http://www.linuxfromscratch.org/lfs/view/6.2/chapter05/adjusting.html
https://wiki.debian.org/FakeRoot
https://archlinuxarm.org/forum/viewtopic.php?f=57&t=6163
https://www.phenix.bnl.gov/~purschke/RescueCD/
https://github.com/ivandavidov/minimal-linux-script
https://askubuntu.com/questions/109413/how-do-i-use-overlayfs
https://how-to-build-for-arm.wikispaces.com/
https://arsv.github.io/perl-cross/
http://www.ibb.net/~anne/keyboard.html

Recipe
------

#########
# PHASE 0
#########

# Prepare the host. We use Archlinux 64-bit as we don't fully trust the
# 32-bit toolchain in Archlinux32 (yet). And a 64-bit based toolchain is
# more usable anyway nowadays.

# Archlinux with base and base-devel (2018.01.01-x86_64.iso).
# OpenSSH and editor (joe), grub.

# Install necessary tools

./install_host.sh

# Prepare the cross-compiler for the destination platform, in our
# case i486.
#
# configuration of crosstools-ng:
#
# Target architecture i486
# Bitness 32-bit
# Architecture level i486
# Emit assembly for CPU i486
# Toolchain bug URL: https://bugs.archlinux32.org
# Type: Cross
# Build System: empty (was: x86_64-pc-linux-gnu)
# No NLS
# Target OS linux
# version of linux 4.13.9
# binutils 2.29.1
# select ld, gold as linkers
# C-library: glibc
# gcc 7.2.0
# no libmpx
# Don't forget to enable C++!

ct-ng menuconfig
cp .config ct-ng.config

# build the toolchain, results in a 486 toolchain in /home/cross/x-tools

./build_cross.sh

# prepare repo where we build stage 1 with the cross-compiler

su cross ./prepare_stage1_repo.sh

#########
# PHASE 1
#########

# Build stage1 in $STAGE1_BUILD with the cross-compiler and modified
# PKGBUILDs and patches into $STAGE1_CHROOT.

# we cannot build the glibc or the compilers, we create phantom packages
# by hand without makepkg with files from the toolchain's sysroot

# so we build gcc-libs for compiler libraries (C and C++) and the glibc
# we will NOT build them using the cross-compiler as packages but later
# at the end of phase 1. This ensures glibc and gcc-libs are around as
# dependency for makepkg all the time, if not the original one, so close
# ones fitting to the crosstoolchain.

su cross ./create_gcc-lib_shim.sh

su cross ./create_glibc_shim.sh

# take pre-computed cert stores from an existing machine as the
# dependencies to build the package are just too many

su cross ./create_ca-certificates-utils_shim.sh

# TODO FROM HERE:


# build packages for the i486-chroot
####################################

All packages we built here are installed with pacman into i486-chroot
and with bsdtar in the toolchains sysroot

# the package list
##################

export PATH=/home/cross/x-tools/i486-unknown-linux-gnu/bin:${PATH}

# basic packages 
PACKAGES="iana-etc filesystem linux-api-headers tzdata ncurses readline bash \
joe \
attr acl gmp gdbm db perl openssl pambase zlib cracklib libtirpc pam libcap coreutils
util-linux e2fsprogs \
expat bzip2 lz4 xz pcre less gzip tar libarchive curl ca-certificates-utils \
archlinux-keyring archlinux32-keyring pacman-mirrorlist pacman \
sed fakeroot texinfo grep findutils file diffutils ed patch \
make mpfr gawk libmpc binutils gcc \
kbd linux procps-ng shadow uinit \
glibc \
net-tools libmnl elfutils libnfnetlink iptables iproute2 \
libedit openssh \
sysfsutils libidn nettle iputils"
# libunwind
# TODO: sort out name clash glibc and glibc-real

# for ncurses, readline for bash
# attr for acl
# gdbm, db for perl
# libtirpc for pam
# zlib for cracklib
# cracklib, pam for libcap
# gmp, openssl, libcap for coreutils
# zlib for cracklib
# libutil-linux and util-linux for e2fsprogs
# expat, bzip2, lz4, xz for libarchive
# libarchive, curl for pacman
# file (libmagic) for ...
# gmp, mpfr for gawk, gcc
# libnfnetlink for iptables
# libmnl, libelf, iptables for iproute2
# libedit for openssh
# sysfsutils and libidn, nettle for iputils
SYSROOT_PACKAGES="ncurses readline attr acl gmp gdbm db zlib cracklib libtirpc pam libcap openssl \
libutil-linux util-linux \
expat bzip2 lz4 xz pcre gzip libarchive curl \
file libmpc mpfr libmnl libelf libnfnetlink iptables \
libedit sysfsutils libidn"

# cross-compiling perl doesn't work in parallel
NOPARALLEL_PACKAGE="perl"

for p in $PACKAGES; do
	# TODO: for some packages, uinit
	# yaourt -G $p
	asp export $p
	cd $p

	# TODO: if exists packages32 diff-PKGBUILD, attach at the end

	sed -i '/^arch=[^#]*any/!{/^arch=(/s/(/(i486 /}' PKGBUILD
	if test $p in $NOPARALLEL_PACKAGE; then
		$HOME/build/makepkg-i486 -C --config $HOME/build/makepkg-i486-noparallel.conf --skipchecksums --skippgpcheck --nocheck > $p.log 2>&1
	else
		$HOME/build/makepkg-i486 -C --config $HOME/build/makepkg-i486.conf --skipchecksums --skippgpcheck --nocheck > $p.log 2>&1
	fi
		
	tail $p.log

	rm -f *debug*.pkg.tar.xz
	cp -v *.pkg.tar.xz $STAGE1_CHROOT/packages/i486/.

	# redo the whole cache
	rm -rf $STAGE1_CHROOT/var/cache/pacman/pkg/*
	rm -rf  $STAGE1_CHROOT/packages/i486/temp.db*
	rm -rf  $STAGE1_CHROOT/packages/i486/temp.files*
	repo-add $STAGE1_CHROOT/packages/i486/temp.db.tar.gz $STAGE1_CHROOT/packages/i486/*pkg.tar.xz
	
	# incrementall add of new package (works once!)
	repo-add -n $STAGE1_CHROOT/packages/i486/temp.db.tar.gz $STAGE1_CHROOT/packages/i486/*pkg.tar.xz

	# for util-linux also libutil-linux
	sudo pacman --noconfirm --config $STAGE1_CHROOT/etc/pacman.conf -r $STAGE1_CHROOT -Syy $p
	pacman --noconfirm --config $STAGE1_CHROOT/etc/pacman.conf -r $STAGE1_CHROOT -Q

	if test $p in $SYSROOT_PACKAGES; then
		pushd $HOME/x-tools/i486-unknown-linux-gnu/i486-unknown-linux-gnu/sysroot
		sudo bsdtar xvf $STAGE1_CHROOT/packages/i486/$p-*.pkg.tar.xz
		popd
	fi
	
	cd ..
done

# special patches for some packages
###################################

# linux-api-headers
sed -i 's@make@make ARCH=i386 CROSS_COMPILE=$HOME/x-tools/i486-unknown-linux-gnu/bin/i486-unknown-linux-gnu-@g' linux-api-headers/PKGBUILD

# ncurses
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' ncurses/PKGBUILD

# readline
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' readline/PKGBUILD

# bash
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' bash/PKGBUILD

# joe
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' joe/PKGBUILD

# gmp
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' gmp/PKGBUILD
# remove explicit CHOST for build host
sed -i 's@--build=${CHOST}@@g' gmp/PKGBUILD

# libcap
sed -i 's@KERNEL_HEADERS=/usr/include@BUILD_CC=gcc CC=i486-unknown-linux-gnu-gcc AR=i486-unknown-linux-gnu-ar RANLIB=i486-unknown-linux-gnu-ranlib KERNEL_HEADERS=/usr/include@' libcap/PKGBUILD
# https://bugs.gentoo.org/604802
#  gperf_case_strncmp (register const char *s1, register const char *s2, register size_t n)
#  gperf output is somehow broken for cross-compilation
# https://bugs.gentoo.org/attachment.cgi?id=462080
# TODO: https://git.kernel.org/pub/scm/linux/kernel/git/morgan/libcap.git/log/
# wget -O libcap-2.25-gperf.patch 'https://604802.bugs.gentoo.org/attachment.cgi?id=462080'
# copy libcap-2.25-gperf.patch from i486 folder
sed -i 's@source=(@source=(libcap-2.25-gperf.patch @' libcap/PKGBUILD
sed -i "s@md5sums=(@md5sums=('SKIP' @" libcap/PKGBUILD
sed -i '2!N; /prepare() *{ *\n *cd/ a \  patch -Np1 < ${srcdir}/libcap-2.25-gperf.patch' libcap/PKGBUILD
# TODO: mail this to https://git.kernel.org/pub/scm/linux/kernel/git/morgan/libcap.git/log/
# libcap needs pam just when building a test (which we cannot execute anyway)
# test.c:3:10: fatal error: security/pam_modules.h: No such file or directory
# #include <security/pam_modules.h>
# => add pam as dependency and build it

# attr
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' attr/PKGBUILD
# no gettext
sed -i 's@^makedepends\(.*\)@#makedepends\1@g' attr/PKGBUILD

# acl
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' acl/PKGBUILD

# gdbm
#??? https://how-to-build-for-arm.wikispaces.com/gdbm: really needed? we should have configure support 
# let's try configure:
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' gdbm/PKGBUILD

# db
sed -i 's@\.\./dist/configure@../dist/configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' db/PKGBUILD

# perl
# the official cross-compilation support in Perl is weird and needs a
# running remote SSH access to the real machine:
# https://stackoverflow.com/questions/5464538/cross-compile-perl-for-arm
#
# we go with https://arsv.github.io/perl-cross/
sed -i '/source=/ a\        https://github.com/arsv/perl-cross/releases/download/1.1.8/perl-cross-1.1.8.tar.gz' perl/PKGBUILD
sed -i "/md5sums=/ a\         'SKIP'" perl/PKGBUILD
sed -i '1!N; /prepare() *{\n *cd/ a \  tar --strip-components=1 -zxf ${srcdir}/perl-cross-1.1.8.tar.gz' perl/PKGBUILD
sed -i 's@./Configure -des@./configure --target=i486-unknown-linux-gnu@' perl/PKGBUILD
#rm: cannot remove '/home/cross/build/perl/pkg/perl/usr/bin/perl5.26.1': No such file or directory
sed -i 's@\(rm "$pkgdir/usr/bin/perl$pkgver\)@#\1@g' perl/PKGBUILD
# the hook fails as we lack some findtools and sed
# pacman does not have a --no-execute-hooks mode
#Can't open /dev/null: No such file or directory
#/usr/share/libalpm/scripts/detect-old-perl-modules.sh: line 8: find: command not found
#/usr/share/libalpm/scripts/detect-old-perl-modules.sh: line 19: pacman: command not found
#/usr/share/libalpm/scripts/detect-old-perl-modules.sh: line 19: wc: command not found
#/usr/share/libalpm/scripts/detect-old-perl-modules.sh: line 25: wc: command not found
#/usr/share/libalpm/scripts/detect-old-perl-modules.sh: line 13: sed: command not found

# openssl
sed -i "s@'i686'@'i486'@g" openssl/PKGBUILD
# https://how-to-build-for-arm.wikispaces.com/openssl
sed -i "s@'linux-elf'@'linux-generic32'@g" openssl/PKGBUILD
sed -i 's@shared no-ssl3-method ${optflags}@shared ${optflags}@' openssl/PKGBUILD
sed -i "s@make@make TARGETMACH=i486-unknown-linux-gnu BUILDMACH=x86_64-pc-linux-gnu CROSS=i486-unknown-linux-gnu CC=i486-unknown-linux-gnu-cc LD=i486-unknown-linux-gnu-ld AS=i486-unknown-linux-gnu-as@g" openssl/PKGBUILD
# TODO: bc is needed in the chroot to rebuild bc later, either build bc
# inside chroot or cross-compile here

# zlib
sed -i '1!N; /autoreconf.*\n/ s@./configure@./configure -host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@' zlib/PKGBUILD
sed -i "s@make@make TARGETMACH=i486-unknown-linux-gnu BUILDMACH=x86_64-pc-linux-gnu CROSS=i486-unknown-linux-gnu CC=i486-unknown-linux-gnu-cc LD=i486-unknown-linux-gnu-ld AS=i486-unknown-linux-gnu-as@g" zlib/PKGBUILD

# cracklib
sed -i 's@./configure@./configure -host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@' cracklib/PKGBUILD
# the dictionary cannot be created while packaging by calling the cross-compiled tool!
# we are not interested in an actually running cracklib doing some security checks, just in the library
#./util/cracklib-packer: line 117: /home/cross/build/cracklib/src/cracklib-2.9.6/util/.libs/lt-cracklib-packer: No such file or directory
sed -i 's/\(  \+sh\)/#\1/g' cracklib/PKGBUILD
sed -i 's/\(  \+ | sh\)/#\1/g' cracklib/PKGBUILD

# libtirpc
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' libtirpc/PKGBUILD
# disable Kerberos
sed -i "/depends=/s/'krb5'//" libtirpc/PKGBUILD
# gssapi seems also to be a dependency, not in PKBUILD, disable it
sed -i 's@./configure@./configure --disable-gssapi@g' libtirpc/PKGBUILD
# doens't really like to be cross-compiled..
# xdr_sizeof.c:93:13: error: 'uintptr_t' undeclared (first use in this function); did you mean '__intptr_t'?
# => https://bugzilla.redhat.com/show_bug.cgi?id=1482063
# => libtirpc-1.0.2-stdint.patch
sed -i 's@source=(@source=(libtirpc-1.0.2-stdint.patch @' libtirpc/PKGBUILD
sed -i "s@sha1sums=(@sha1sums=('0322752c231884c5434b4e56a3c376d7bfedf9d9' @" libtirpc/PKGBUILD
sed -i '/build()/ i \  prepare() { \n\  cd ${pkgname}-${pkgver}\n\ patch -Np1 < ${srcdir}/libtirpc-1.0.2-stdint.patch \n }' libtirpc/PKGBUILD

# pam
# no flex, w3m, docboox-xml/xsl (no docu and take flex from the host)
sed -i "s@makedepends=@#makedepends=@" pam/PKGBUILD
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' pam/PKGBUILD
# disable NIS/YP
sed -i 's@./configure@./configure --disable-nis@g' pam/PKGBUILD
# no help, still errors:
# unix_passwd.c:56:10: fatal error: rpcsvc/yp_prot.h: No such file or directory
# #include <rpcsvc/yp_prot.h>
# => pam-1.3.0-unix-passwd-no-yp.patch
sed -i 's@source=(@source=(pam-1.3.0-unix-passwd-no-yp.patch @' pam/PKGBUILD
sed -i "s@md5sums=(@md5sums=('3f5edd685cdd2c0a2ca44bc6e75320d8' @" pam/PKGBUILD
sed -i '/patch -Np/ a \  patch -Np1 -i "${srcdir}/pam-1.3.0-unix-passwd-no-yp.patch"' pam/PKGBUILD
# disable docu rebuilding
sed -i 's@./configure@./configure --disable-regenerate-docu@' pam/PKGBUILD
# no documentation built, so nothing to remove
sed -i '2!N; /# FS #40749\n \+rm/ s/rm/#rm/g' pam/PKGBUILD

# tons of tools needed to build documentation, we ommit the documentation right now
sed -i "s@makedepends@#makedepends@" pam/PKGBUILD

# coreutils  
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' coreutils/PKGBUILD
# apply man generation patch (one has to wonder, is it maintained at all?)
# help2man errors: help2man: can't get `--help' info from man/chmod.td/chmod
# http://ftp.lfs-matrix.net/pub/clfs/conglomeration/coreutils/coreutils-8.28-noman.patch
# based on a patch by William Harrington (kb0iic at cross-lfs dot org) 2014-10-30 for coreutils 8.23
sed -i 's@source=(@source=(coreutils-8.28-noman.patch @' coreutils/PKGBUILD
sed -i "s@md5sums=(@md5sums=('SKIP' @" coreutils/PKGBUILD

# util-linux
# disable some dependencies on systemd, python, libcap-ng
sed -i 's@makedepends\(.*\)@#makedepends\1@g' util-linux/PKGBUILD
sed -i 's@ \+depends\(.*\)@#depends\1@g' util-linux/PKGBUILD
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' util-linux/PKGBUILD
# no python
sed -i 's@--with-python=3@--without-python \\@g' util-linux/PKGBUILD
# no systemd
sed -i '/--without-python/ a \ --without-systemd --without-systemdsystemunitdir' util-linux/PKGBUILD
# sed -i '/ListenStream/ aRuntimeDirectory=uuidd' "$pkgdir/usr/lib/systemd/system/uuidd.socket"
sed -i "s@\(sed.*\)@#\1@" util-linux/PKGBUILD

# e2fsprogs
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' e2fsprogs/PKGBUILD
# remove superflous 'bc' make dependency
sed -i "/makedepends/s/'bc'//g" e2fsprogs/PKGBUILD

# expat
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' expat/PKGBUILD

# bzip2
sed -i "s@\( \+\)make@\1make CC=i486-unknown-linux-gnu-cc RANLIB=i486-unknown-linux-gnu-ranlib AR=i486-unknown-linux-gnu-ar@g" bzip2/PKGBUILD

# lz4
sed -i "s@\( \+\)make@\1make CC=i486-unknown-linux-gnu-cc RANLIB=i486-unknown-linux-gnu-ranlib AR=i486-unknown-linux-gnu-ar@g" lz4/PKGBUILD
# lz4 has a git makedepends, diffutils for unit tests
sed -i 's@makedepends\(.*\)@#makedepends\1@g' lz4/PKGBUILD
sed -i 's@checkdepends\(.*\)@#checkdepends\1@g' lz4/PKGBUILD

# xz
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' xz/PKGBUILD
# with gcc 7.2 we get new errors
sed -i 's@--enable-werror@--disable-werror@g' xz/PKGBUILD

# pcre
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' pcre/PKGBUILD

# less
sed -i 's@sh configure@sh configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' less/PKGBUILD

# gzip
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' gzip/PKGBUILD

# tar
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' tar/PKGBUILD
# checking whether mknod can create fifo without root privileges... configure: error: in `/build/tar/src/tar-1.29':
# configure: error: you should not run configure as root (set FORCE_UNSAFE_CONFIGURE=1 in environment to bypass this check)
# See `config.log' for more details
sed -i 's@./configure@FORCE_UNSAFE_CONFIGURE=1 ./configure@g' tar/PKGBUILD

# libarchive
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' libarchive/PKGBUILD

# curl
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' curl/PKGBUILD
# build with minimal features, we don't need some libraries
sed -i "/depends=/s/'krb5'//" curl/PKGBUILD
sed -i "/depends=/s/'libssh2'//" curl/PKGBUILD
sed -i '/--prefix=\/usr/ a \      --without-libssh2 \\' curl/PKGBUILD
sed -i "/depends=/s/'libpsl'//" curl/PKGBUILD
sed -i '/--prefix=\/usr/ a \      --without-libpsl \\' curl/PKGBUILD
sed -i "/depends=/s/'libnghttp2'//" curl/PKGBUILD
sed -i '/--prefix=\/usr/ a \      --without-nghttp2 \\' curl/PKGBUILD
sed -i '/--prefix=\/usr/ a \      --without-gssapi \\' curl/PKGBUILD
# no ca-certificates, needs tons of tools to build (like p11-kit), so we 
# create a fake one with certificates from the host (is this LE/BE-safe?)
# can we actually simply ommit them for now?
sed -i "/depends=/s/'ca-certificates'//" curl/PKGBUILD
# zsh, perl is used to create a completion file for curl and zsh
sed -i '/--prefix=\/usr/ a \      --without-zsh-functions-dir \\' curl/PKGBUILD

# pacman-mirrorlist
cp $HOME/packages32/core/pacman-mirrorlist/mirrorlist pacman-mirrorlist/.
./update-list
cat > pacman-mirrorlist/mirrorlist >> pacman-mirrorlist/mirrorlist <<EOF
## Switzerland
Server = https://archlinux32.andreasbaumann.cc/$arch/$repo
EOF

# archlinux-keyring

# archlinux32-keyring
cp -R $HOME/packages32/core/archlinux32-keyring .

# pacman
# append archlinux32 keyring
cat ~/packages32/core/pacman/PKGBUILD >> pacman/PKGBUILD 
# craft a temporary i486 pacman.conf (no gpg and hard-coded architecture)
cp pacman.conf.i686 pacman.conf.i486
sed -i 's@^\(SigLevel\)@#\1@' pacman.conf.i486
sed -i 's@^\(LocalFileSigLevel\)@#\1@' pacman.conf.i486
# TODO: ADAPT sed -i 's@i686@i486@' pacman/PKGBUILD
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' pacman/PKGBUILD
# asciidoc is a makedepend, we can use the one on the host (this means
# also we can pacman only rebuild on i486 itself after the whole python
# zoo is installed)
sed -i "/makedepends=/s/'asciidoc'//" pacman/PKGBUILD
# minimal dependencies, we don't sign anything yet, gpgme and gnupg have
# far too many dependencies which cannot be easily cross-compiled
sed -i "s/'gpgme'//" pacman/PKGBUILD
sed -i 's@./configure@./configure --without-gpgme@' pacman/PKGBUILD
# use 486 config and not 686 one
sed -i 's@pacman.conf.i686@pacman.conf.i486@' pacman/PKGBUILD
# some more architecture patching
sed -i 's@i686@i486@g' pacman/PKGBUILD

# sed
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' sed/PKGBUILD
# gettext: take the one from the host
sed -i 's@makedepends\(.*\)@#makedepends\1@g' sed/PKGBUILD

# fakeroot
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' fakeroot/PKGBUILD
# disable makedepends and take out po4a
sed -i 's@\(cd doc\)@#\1@g' fakeroot/PKGBUILD
sed -i 's@\(po4a\)@#\1@g' fakeroot/PKGBUILD
# we have no ld.so.conf, so we can ignore this:
#/tmp/alpm_va2bmk/.INSTALL: line 2: usr/bin/ldconfig: No such file or directory
#error: command failed to execute correctly

# texinfo
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' texinfo/PKGBUILD

# grep
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' grep/PKGBUILD

# findutils
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' findutils/PKGBUILD

# file
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' file/PKGBUILD

# diffutils
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' diffutils/PKGBUILD
# http://lists.busybox.net/pipermail/buildroot/2017-September/203435.html
sed -i '/.\/configure/ i \  echo "gl_cv_func_getopt_gnu=yes" > config.cache' diffutils/PKGBUILD
sed -i 's@./configure@./configure --cache-file=config.cache@g' diffutils/PKGBUILD

# ed
sed -i 's@./configure@./configure CC=i486-unknown-linux-gnu-gcc@g' ed/PKGBUILD

# patch
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' patch/PKGBUILD

# make
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' make/PKGBUILD
# no guile
sed -i "/depends=/s/'guile'//" make/PKGBUILD
sed -i 's@./configure@./configure --without-guile@g' make/PKGBUILD

# mpfr
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' mpfr/PKGBUILD

# gawk
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' gawk/PKGBUILD
# we don't have a valid locale yet, disable NLS
sed -i 's@./configure@./configure --disable-nls@g' gawk/PKGBUILD

# libmpc
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' libmpc/PKGBUILD

# binutils
sed -i '/--prefix=\/usr/ a \     --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu \\' binutils/PKGBUILD
# git for release checkouts, a bad idea IMHO, current git+https is commented out in trunk anyway
sed -i "/makedepends/s/git//g" binutils/PKGBUILD

# libunwind
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' libunwind/PKGBUILD
# no TeX, no docu
sed -i "/makedepends=/s/'texlive-core'//g" libunwind/PKGBUILD

# strace
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' strace/PKGBUILD

# gcc
sed -i '/--prefix=\/usr/ a \     --target=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu \\' gcc/PKGBUILD
# no doxygen documentation
sed -i "/makedepends=/s/doxygen//" gcc/PKGBUILD
# no ADA
sed -i "/makedepends=/s/gcc-ada//" gcc/PKGBUILD
sed -i '/pkgname/ s/gcc-ada//g' gcc/PKGBUILD
sed -i '/enable-languages/ s/ada//g' gcc/PKGBUILD
# do not build git versions or from git!
sed -i 's/pkgver=7.2.1/pkgver=7.2.0/' gcc/PKGBUILD
sed -i "/makedepends=/s/git//" gcc/PKGBUILD
sed -i 's@git+https://gcc.gnu.org/git/gcc.git#commit=${_commit}@https://ftp.gnu.org/gnu/${pkgname}/${pkgname}-${pkgver}/${pkgname}-${pkgver}.tar.gz@g' gcc/PKGBUILD
sed -i 's@cd gcc$@cd ${pkgname}-${pkgver}@g' gcc/PKGBUILD
sed -i 's@$srcdir/gcc/configure@$srcdir/${pkgname}-${pkgver}/configure@g' gcc/PKGBUILD
# send bugs to the right place
sed -i 's@https://bugs.archlinux.org/@https://bugs.archlinux32.org/@g' gcc/PKGBUILD
# no LTO and plugins, they break and we don't need them
sed -i 's@--enable-plugin@--disable-plugin@' gcc/PKGBUILD
sed -i 's@--enable-lto@--disable-lto@' gcc/PKGBUILD
sed -i '/enable-languages/ s/lto,//g' gcc/PKGBUILD
# no other languages (Fortran, go, objc, etc)
sed -i '/pkgname/ s/gcc-fortran//g' gcc/PKGBUILD
sed -i '/enable-languages/ s/,fortran//g' gcc/PKGBUILD
sed -i '/pkgname/ s/gcc-go//g' gcc/PKGBUILD
sed -i '/enable-languages/ s/go,//g' gcc/PKGBUILD
sed -i '/pkgname/ s/gcc-objc//g' gcc/PKGBUILD
sed -i '/enable-languages/ s/objc,//g' gcc/PKGBUILD
sed -i '/enable-languages/ s/,obj-c++//g' gcc/PKGBUILD
# disable some libraries (libgomp doesn't cross compile, NLS we don't need)
sed -i "/--disable-libssp/ a \      --disable-libgomp \\" gcc/PKGBUILD
sed -i "/--disable-libssp/ a \      --disable-nls \\" gcc/PKGBUILD
# disable threads
sed -i 's@--enable-threads=posix@--disable-threads@' gcc/PKGBUILD
=> current use PKGBUILD-gcc-cross, sorry, too many changes!
# disable all languages but C and C++
use gcc-cross-PKGBUILD

# kbd
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' kbd/PKGBUILD
# no unit testing (using C 'check')
sed -i 's@makedepends\(.*\)@#makedepends\1@g' kbd/PKGBUILD

# procps-ng
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' procps-ng/PKGBUILD
# no systemd for now
sed -i "/makedepends=/s/'systemd'//" procps-ng/PKGBUILD
sed -i "/depends=/s/'libsystemd'//" procps-ng/PKGBUILD
sed -i 's@--with-systemd@--without-systemd@' procps-ng/PKGBUILD
# do not use the stub rpl_malloc/rpl_realloc functions (they don't cross-compile
# and we know that glibc fixed those problems long time ago)
sed -i '2!N; /prepare()/ a \        sed -i "s/AC_FUNC_MALLOC/dnl AC_FUNC_MALLOC/" configure.ac \
	sed -i "s/AC_FUNC_REALLOC/dnl AC_FUNC_RELLOC/" configure.ac \
	autoconf
' PKGBUILD

# shadow
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' shadow/PKGBUILD
# remove docu and git dependencies
sed -i 's@makedepends\(.*\)@#makedepends\1@g' shadow/PKGBUILD
# needs xml2po
sed -i 's@--enable-man@--disable-man@g' shadow/PKGBUILD
sed -i '/find/,/-delete/{s/\(.*\)/#\1/g}' shadow/PKGBUILD
sed -i '/rmdir/,/man8/{s/\(.*\)/#\1/g}' shadow/PKGBUILD
sed -i 's/^#}/}/' shadow/PKGBUILD
sed -i '2!N; /prepare()/ a \  sed -i "/SUBDIRS/s/man//g" Makefile.am' shadow/PKGBUILD

# uinit
sed -i 's/make /make CC=i486-unknown-linux-gnu-gcc /g' uinit/PKGBUILD
# remove git dependency
sed -i 's@makedepends\(.*\)@#makedepends\1@g' uinit/PKGBUILD

# linux
sed -i 's@make@make ARCH=i386 CROSS_COMPILE=$HOME/x-tools/i486-unknown-linux-gnu/bin/i486-unknown-linux-gnu-@g' linux/PKGBUILD
# remove make dependencies, currently we build without module support
sed -i 's@makedepends\(.*\)@#makedepends\1@g' linux/PKGBUILD
# remove dependencies from kernel package, we don't have modules or a ramdisk right now
sed -i 's/ \+\(depends=\)/#\1/' PKGBUILD
# ignore failing hooks on installation, it's just depmod and mkinitcpio which we both don't need

# glibc
sed -i 's@/configure"@/configure" --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' PKGBUILD
# change bug reporting
sed -i 's@https://bugs.archlinux.org/@https://bugs.archlinux32.org/@g' PKGBUILD
# disable multilib, we are on 32-bit only
sed -i 's@--enable-multi-arch@--disable-multi-arch@g' PKGBUILD
# git for release checkouts, a bad idea IMHO, current git+https is commented out in trunk anyway
sed -i "/makedepends/s/git//g" PKGBUILD
# gd for memory profiles, no please
sed -i "/makedepends/s/gd//g" PKGBUILD
cat ~/packages32/core/glibc/PKGBUILD >> PKGBUILD
sed -i "/makedepends/s/lib32-gcc-libs//g" PKGBUILD
sed -i "/pkgname/s/lib32-glibc//g" PKGBUILD

# net-tools
sed -i "s@make @make CC=i486-unknown-linux-gnu-cc LD=i486-unknown-linux-gnu-ld@g" net-tools/PKGBUILD
sed -i "s@make\$@make CC=i486-unknown-linux-gnu-cc LD=i486-unknown-linux-gnu-ld @g" net-tools/PKGBUILD
# git for release checkouts, a bad idea IMHO, current git+https is commented out in trunk anyway
sed -i "/makedepends/s/git//g" net-tools/PKGBUILD
# apply patch for double definitons in ip.h
sed -i 's@source=(@source=(net-tools-1.60-if_tunnel.patch @' net-tools/PKGBUILD
sed -i "s@sha1sums=(@sha1sums=('SKIP' @" net-tools/PKGBUILD
sed -i '2!N; /prepare() {/ a \  pushd ${srcdir}/${pkgname}; patch -Np1 < ${srcdir}/net-tools-1.60-if_tunnel.patch; popd' PKGBUILD

# libmnl
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' libmnl/PKGBUILD

# libelf
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' libelf/PKGBUILD

# libnfnetlink
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' libnfnetlink/PKGBUILD

# iptables
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' iptables/PKGBUILD
sed -i 's@--enable-bpf-compiler@--disable-bpf-compiler@g' iptables/PKGBUILD
# disable nftable support, draws in more libraries, we need the xtables depevelopment mainly now for iproute2
sed -i 's@./configure@./configure --disable-nftables@' iptables/PKGBUILD
# disable connection tracking
sed -i 's@./configure@./configure --disable-connlabel@' iptables/PKGBUILD

# iproute2
# cross-compilation and verbosity flags
sed -i "s@make\$@make V=1 CC=i486-unknown-linux-gnu-cc AR=i486-unknown-linux-gnu-ar@g" iproute2/PKGBUILD
# disabled iptables (too many dependencies)
# disable linux-atm (unlikely we have such a hardware for i486)
sed -i 's@^makedepends\(.*\)@#makedepends\1@g' iproute2/PKGBUILD
sed -i 's@^depends\(.*\)@#depends\1@g' iproute2/PKGBUILD

# libedit
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' libedit/PKGBUILD

# openssh
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' openssh/PKGBUILD
# package suffers from featuritis
# remove ldns and kerberos5 support, keep libedit (as it's easy to build)
# ssh => not good, openssl <> unbound <> openssl cycle and mess
sed -i 's@^makedepends\(.*\)@#makedepends\1@g' openssh/PKGBUILD
sed -i 's@^depends\(.*\)@#depends\1@g' openssh/PKGBUILD
sed -i 's@--with-ldns@--without-ldns@g' openssh/PKGBUILD
sed -i 's@--with-kerberos5=/usr@--without-kerberos5@g' openssh/PKGBUILD
#ln: failed to create symbolic link '/build/openssh/pkg/openssh/usr/share/man/man1/slogin.1.gz': No such file or directory
sed -i 's@\(ln -sf ssh.1.gz.*\)@#\1@g' PKGBUILD

# libidn
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' libidn/PKGBUILD

# sysfsutils
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' sysfsutils/PKGBUILD

# nettle
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu --build=x86_64-pc-linux-gnu@g' PKGBUILD

# iputils
# no documentation and use git from host
sed -i 's@\(make doc man\)@#\1@' iputils/PKGBUILD
sed -i 's@^makedepends\(.*\)@#makedepends\1@g' iputils/PKGBUILD
sed -i 's@make @make CC=i486-unknown-linux-gnu-cc LD=i486-unknown-linux-gnu-ld@g' iputils/PKGBUILD
sed -i 's@\(install -m644 doc\)@#\1@' iputils/PKGBUILD
sed -i 's@\("${pkgdir}"/usr/share\)@#\1@' iputils/PKGBUILD


# special operations
####################

# archlinux32-keyring
cd $HOME/build
cp -a $HOME/packages32/core/archlinux32-keyring .
cd archlinux32-keyring
$HOME/build/makepkg-i486 -C --config $HOME/build/makepkg-i486.conf --skipchecksums --skippgpcheck --nocheck > $p.log 2>&1

# aftermatch for gcc/binutils
#collect2: unable to find ld
=> this is the cross compiled gcc for i486 inside the chroot, it expects
   its platform dependend stuff in /usr/lib/gcc/i486-unknown-linux-gnu/7.2.0
=> we can temporarily fix this:
sudo ln -s /usr/bin/ld $STAGE1_CHROOT/usr/lib/gcc/i486-unknown-linux-gnu/7.2.0/ld


#######################################
##### TODO FROM HERE
#######################################

# TODO: m4. autoconf, automake, libtool are not really bootstrappable in x-tools
# basic packages, non-virtual one from above: kernel, shell, pacman, editor, coreutils, development
# tools (some of them can be bootstrapped inside like the autotools, perl; and they also should!)

# linux-headers is important so we can build kmod inside the chroot
# linux itself is tricky. For now we will boot with direct kernel parameters and binary in libvirt/qemu

PACKAGES=          \
     \
 \
libffi glib2 libunistring gettext"

# some binaries in the cross tools (also known as perl) have really
# weird library pathes (and no rpath it seems)
export LD_LIBRARY_PATH=/home/cross/x-tools/i486-unknown-linux-gnu/i486-unknown-linux-gnu/sysroot/usr/lib/:/home/cross/x-tools/i486-unknown-linux-gnu/i486-unknown-linux-gnu/sysroot/usr/lib/perl5/5.26/core_perl/CORE
export PATH=/home/cross/x-tools/i486-unknown-linux-gnu/i486-unknown-linux-gnu/sysroot/bin:/home/cross/x-tools/i486-unknown-linux-gnu/i486-unknown-linux-gnu/sysroot/usr/bin:${PATH}

###
TODO FROM HERE

	# TODO:
	# openssl for linux
	# autoreconf needs autotools/m4 and dependencies (crosstool-ng autotools are broken for me)\
	# libunistring for gettext
	# libffi for glib2
	pushd $HOME/x-tools/i486-unknown-linux-gnu/i486-unknown-linux-gnu/sysroot
	bsdtar xf $STAGE1_CHROOT/packages/i486/m4-1.4.18-1-i486.pkg.tar.gz 
	bsdtar xf $STAGE1_CHROOT/packages/i486/autoconf-2.69-4-any.pkg.tar.gz 
	bsdtar xf $STAGE1_CHROOT/packages/i486/automake-1.15.1-1-any.pkg.tar.gz 
	bsdtar xf $STAGE1_CHROOT/packages/i486/libffi-3.2.1-2-i486.pkg.tar.gz 
	bsdtar xf $STAGE1_CHROOT/packages/i486/libunistring-0.9.7-1-i486.pkg.tar.gz
	popd

	cd ..
done


# special patches for some packages
###################################

# linux
# proto-kernel without ramdisk and modules if possible, just enough to boot into
# a virtual machine (we take qemu/kvm/libvirt)
# libelf is only needed for loadable modules, we disable that for now
# careful about AMD and Intel DRM modules, they simply segfault in the 
# kernel when they don't have proper access to their firmware
sed -i 's@config.i686@config.i486@g' linux/PKGBUILD

# circular reference in getext (needed by attr, which needs also gettext)
sed -i 's@makedepends\(.*\)@#makedepends\1@g' attr/PKGBUILD

# autoconf needs help2man, checks need fortan (wow. that package is old!)
# depends contains base-devel stuff?! diffutils
sed -i 's@makedepends\(.*\)@#makedepends\1@g' autoconf/PKGBUILD
sed -i 's@checkdepends\(.*\)@#checkdepends\1@g' autoconf/PKGBUILD
sed -i 's@depends\(.*\)@#depends=\1@g' autoconf/PKGBUILD

# automake needs dejagnu for testing, not now, disabling checks
sed -i 's@checkdepends\(.*\)@#checkdepends\1@g' automake/PKGBUILD

# libool: trusting the toolchain here, no silly checks :-)
sed -i 's@makedepends\(.*\)@#makedepends\1@g' libtool/PKGBUILD

# afterpatching; autreconf has a hard-coded #! /bin/perl -w bang,
# seriously!
chmod u+w /home/cross/x-tools/i486-unknown-linux-gnu/i486-unknown-linux-gnu/sysroot/usr/bin/autoreconf
sed -i 's@^#/bin/perl@/home/cross/x-tools/i486-unknown-linux-gnu/i486-unknown-linux-gnu/sysroot/usr/bin/perl@g' \
	/home/cross/x-tools/i486-unknown-linux-gnu/i486-unknown-linux-gnu/sysroot/usr/bin/autoreconf

# libarchive calls autoreconf, this is quite annoying as perl in crosstool-nt or
# build for the x-tools is hard to get running properly
# do the autoreconf -fi outside, create a package libarchive-3.3.2-retooled.tgz
# libarchive has trouble with wchar_t (and has quite some other trouble around autoconf it seems)
# remove the wchar_t and wchar_t sizeof test in configure.ac manutally before retooling
# and of course tests fail!
sed -i "s@^source=.*@source=('libarchive-3.3.2-retooled.tgz')@g" libarchive/PKGBUILD
sed -i "s@^sha256sums=.*@sha256sums=('1f856e6f5cc0e1479f381e381a031ba19d09f80b51ac88e74b2c140fc78606e8')@g" libarchive/PKGBUILD
sed -i 's@autoreconf@#autoreconf@g' libarchive/PKGBUILD

#depends=(ca-certificates-{mozilla,cacert})
sed -i 's@depends=(ca-certificates-{mozilla,cacert})@##depends=(ca-certificates-{mozilla,cacert})\1@g' ca-certificates/PKGBUILD

# curl
######
# curl needs asciidoc and p11-kit, don't build them, use them from the host
sed -i 's@makedepends\(.*\)@#makedepends\1@g' curl/PKGBUILD
# build with minimal features, enough to make pacman download packages
sed -i 's@depends\(.*\)@depends=('ca-certificates' 'openssl' 'zlib')@g' curl/PKGBUILD
# zsh, perl is used to create a completion file for curl and zsh?
sed -i 's@--with-gssapi@--with-gssapi --without-zsh-functions-dir@g' curl/PKGBUILD

# pacman
########
# pacman's tests mostly fail on non-Archlinux, so skip them
# asciidoc is a makedepend, we can use the one on the host
sed -i 's@makedepends\(.*\)@#makedepends\1@g' pacman/PKGBUILD
sed -i 's@checkdepends\(.*\)@#checkdepends\1@g' pacman/PKGBUILD
# minimal dependencies, we don't sign anything yet
sed -i "s/'gpgme'//g" pacman/PKGBUILD
# we need pkg-config, otherwise pacman find libarchive in the wrong
# place, but pkg-config needs glib2 and glib2 is built using meson (urgh!)
# when we take the host version, lets patch the host pkgconfig file to
# use the sysroot of the toolchain
sed -i 's/exit 1 # \$E_USER_ABORT/# exit 1 # $E_USER_ABORT/g' /home/cross/i486-root/usr/bin/makepkg

# libarchive/libtool fuckups:
# for expat and lzma: /home/cross/x-tools/i486-unknown-linux-gnu/i486-unknown-linux-gnu/sysroot/usr/lib/



# pcre
######
# no C++
sed -i 's@./configure@./configure --disable-cpp@g' pcre/PKGBUILD
# --nocheck as we have trouble to find shared libraries

# findutils
###########
# --nockeck: FAIL: test-mbrtowc1.sh     
#FAIL: test-mbrtowc2.sh
#FAIL: test-mbrtowc3.sh
#FAIL: test-mbrtowc4.sh

# mpfr
######
# builds against host gmp, we want it to build against our version!
sed -i 's@./configure@./configure --with-gmp=/home/cross/i486-root/usr/@g' mpfr/PKGBUILD
# disable checks for cross-compilation
# hack libmpfr.la otherwise libmpc links against the host gmp!:
# dependency_libs=' -L/home/cross/i486-root/usr/lib /usr/lib/libgmp.la'
# to dependency_libs='/home/cross/i486-root/usr/lib/libgmp.la'

# libmpc
########
# builds against host gmp and mpfr, we want it to build against our version!
sed -i 's@./configure@./configure --with-gmp=/home/cross/i486-root/usr/@g' libmpc/PKGBUILD
sed -i 's@./configure@./configure --with-mpfr=/home/cross/i486-root/usr/@g' libmpc/PKGBUILD
# hack libmpc.la (libtool generates a disaster!):
# dependency_libs=' -L/home/cross/i486-root/usr//lib /usr/lib/libmpfr.la /usr/lib/libgmp.la /usr/lib/libgmp.la -lm'
# dependency_libs='/home/cross/i486-root/usr/lib/libmpfr.la /home/cross/i486-root/usr/lib/libgmp.la -lm'

# binutils
##########
sed -i 's@^makedepends\(.*\)@#makedepends\1@g' binutils/PKGBUILD
sed -i 's@^checkdepends\(.*\)@#checkdepends\1@g' binutils/PKGBUILD
sed -i 's@^depends\(.*\)@#depends\1@g' binutils/PKGBUILD
#configure: error: in `/home/cross/build/binutils/src/binutils-build/gold':
#configure: error: C++ preprocessor "/lib/cpp" fails sanity check
#See `config.log' for more details.
#make: *** [Makefile:5995: configure-gold] Error 1
# this is in gold, so let's disable gold! We don't have C++ (yet), so this should not matter..
;ln -s ~/x-tools/i486-unknown-linux-gnu/bin/cpp ~/x-tools/i486-unknown-linux-gnu/lib/cpp
export CPP=/home/cross/x-tools/i486-unknown-linux-gnu/lib/cpp
sed -i 's@--enable-gold@--disable-gold@g' binutils/PKGBUILD

# glibc
#######
# building glibc, again, we get the 'glibc/csu install operand' bug, really annoying 
# remove the git download hack, use vanilla tarball
sed -i 's@^makedepends\(.*\)@#makedepends\1@g' glibc/PKGBUILD
=> breaks, use the shim created out of crosstool-ng in the meantime
dl-sysdep.c:(.text+0x9c): undefined reference to `__memcmp_ia32'
dl-sysdep.c:(.text+0xc0): undefined reference to `__memcmp_ia32'
dl-sysdep.c:(.text+0xe1): undefined reference to `__memcmp_ia32'
dl-sysdep.c:(.text+0x105): undefined reference to `__memcmp_ia32'
dl-sysdep.c:(.text+0x130): undefined reference to `__memcmp_ia32'
/home/cross/build/glibc/src/glibc-build/libc.a(dl-sysdep.o):dl-sysdep.c:(.text+0x15f): more undefined references to `__memcmp_ia32' follow
collect2: error: ld returned 1 exit status
make[2]: *** [../Rules:224: /home/cross/build/glibc/src/glibc-build/elf/sln] Error 1
make[2]: Leaving directory '/home/cross/build/glibc/src/glibc-2.26/elf'
=> again, sounds familiar, this sound like a missing libgcc_s stub for memcmp

# gcc
#####
# needs tons of fixes, most importantly, don't download the who git repo!!
--disable-multilib --disable-bootstrap \
 --with-gmp=/home/cross/i486-root/usr \
      --with-mpfr=/home/cross/i486-root/usr \
      --with-mpc=/home/cross/i486-root/usr \
git -> tarball
only c language
no checkdepdns, makedepnds

why the hell, I switched off c++, so wy are still cpp probes being done!?
/lib/cpp hardcoded, seriosly!!
# in prepare()
ln -s ../bin/cpp /home/cross/x-tools/i486-unknown-linux-gnu/lib/cpp
find . -name configure -exec sed -i 's@/lib/cpp@/home/cross/x-tools/i486-unknown-linux-gnu/bin/cpp@g' {} \;

since 4.8 gcc is written in C++, fine. so we have to have a crosstool-ng C++ or
we must bootstrap gcc
=> we add C++ to the crosstool-ng toolchain, easier and more secure

 included from /home/cross/build/gcc/src/gcc-7.2.0/gcc/genmddeps.c:19:0:
/home/cross/build/gcc/src/gcc-7.2.0/gcc/system.h:540:34: error: declaration of C function ‘const cha
r* strsignal(int)’ conflicts with
 extern const char *strsignal (int);
                                  ^
In file included from /usr/include/c++/4.8.2/cstring:42:0,
                 from /home/cross/build/gcc/src/gcc-7.2.0/gcc/system.h:235,
                 from /home/cross/build/gcc/src/gcc-7.2.0/gcc/genmddeps.c:19:
/usr/include/string.h:562:14: error: previous declaration ‘char* strsignal(int)’ here
 extern char *strsignal (int __sig) __THROW;             ^
In file included from ./bconfig.h:5:0,
=> so, we get to an end here, c++ is taken from the host while cross-compiling?!
-> remove glibc-devel on the host!
-> draw the g++ link, autoconf fails in gcc in funny ways (not finding uint64_t)
-> carefull, we build a gcc over a crossng-gcc, not sure, this is supported..
-> aha. if mpfr, mpc and gmp are not installed and taken from sysroot but from i486-root
   some pathes get messed up.

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82590
https://www.mail-archive.com/gcc-bugs@gcc.gnu.org/msg550065.html
https://gcc.gnu.org/bugzilla/show_bug.cgi?format=multiple&id=54692

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65863
-> huh?
https://gcc.gnu.org/ml/gcc-help/2016-06/msg00016.html
- > yes, this is the inicatition I needed, mpfr, gmp and mpc point to a weird location

The stage one compiler doesn't find the shared library, o well:
/home/cross/build/gcc/src/gcc-build/./gcc/cc1: error while loading shared libraries: libmpc.so.3: cannot open shared object file: No such file or directory
-> export LD_LIBRARY_PATH=/home/cross/x-tools/i486-unknown-linux-gnu/i486-unknown-linux-gnu/sysroot/usr/lib

And it never ends:
In file included from /home/cross/build/gcc/src/gcc-7.2.0/libgcc/libgcc2.c:27:0:
/home/cross/build/gcc/src/gcc-7.2.0/libgcc/../gcc/tsystem.h:87:10: fatal error: stdio.h: No such file or directory
 #include <stdio.h>
          ^~~~~~~~~
compilation terminated.
make[2]: *** [Makefile:491: _muldi3.o] Error 1
-> https://gcc.gnu.org/ml/gcc-help/2012-04/msg00088.html
-> so, let's try giving it a --with-sysroot to the crosstool-ng dirs
-> and this means also it got past stage 1 compilers :-)

/home/cross/x-tools/i486-unknown-linux-gnu/lib/gcc/i486-unknown-linux-gnu/4.9.4/../../../../i486-unknown-linux-gnu/bin/ld: /home/cross/build/gcc/src/gcc-build/./gcc/liblto_plugin.so: error loading plugin: /home/cross/build/gcc/src/gcc-build/./gcc/liblto_plugin.so: wrong ELF class: ELFCLASS32
collect2: error: ld returned 1 exit status
make[2]: *** [Makefile:982: libgcc_s.so] Error 1
=> for now, remove LTO stuff in PKGBUILD

make: *** i486-unknown-linux-gnu/libstdc++-v3/doc: No such file or directory.  Stop.
==> ERROR: A failure occurred in build().
    Aborting...
=> remove the PKGBUILD line #  make -C $CHOST/libstdc++-v3/doc DESTDIR="$pkgdir" doc-install-man
libstdc++-v3/
=> # make documentation
  #make -C $CHOST/libstdc++-v3/doc doc-man-doxygen

install: failed to access ‘/home/cross/build/gcc/pkg/gcc/usr/lib/gcc/i486-unknown-linux-gnu/7.2.0/’: No such file or directory
=> gcc auto-probed itself into i486-pc-linux-gnu, so the installed files are there
CHOST="i486-pc-linux-gnu"    
make: Leaving directory '/home/cross/build/gcc/src/gcc-build/gcc'
install: failed to access ‘/home/cross/build/gcc/pkg/gcc/usr/lib/gcc/i486-unknown-linux-gnu/7.2.0/’: No such file or directory
=> sweet, let's try a symlink

_libdir=usr/lib/gcc/$CHOST/$pkgver
=> hard-code: to _libdir=usr/lib/gcc/i486-pc-linux-gnu/$pkgver
=> nope, now others break
this is hardly the ArchLinux way: vanilla and upstream

again CHOST set to  i486-pc-linux-gnu
=> this package is a disaster!
=> we have a mess with two CHOSTS, one for crosstool-ng (unknown) and
   one for our chroot

# remove traces of ADA
  rm "$pkgdir"/usr/share/info/{gccgo,gfortran.info}

# rm: cannot remove ‘/home/cross/build/gcc/pkg/gcc/usr/share/info/gccgo’: No such file or directory
#  rm "$pkgdir"/usr/share/info/{gccgo,gfortran.info}

/home/cross/x-tools/i486-unknown-linux-gnu/lib/gcc/i486-unknown-linux-gnu/4.9.4/../../../../i486-unknown-linux-gnu/bin/ld: cannot find -lquadmath
collect2: error: ld returned 1 exit status
libtool: install: error: relink `libgfortran.la' with the above command before installing it
make: *** [Makefile:1331: install-toolexeclibLTLIBRARIES] Error 1
make: Leaving directory '/home/cross/build/gcc/src/gcc-build/i486-unknown-linux-gnu/libgfortran'
==> ERROR: A failure occurred in package_gcc-libs().
    Aborting...
=> libquadmath must be retooled before libfortran
=> nope libfortran simply fails to relink => remove it

install: cannot stat ‘/home/cross/build/gcc/src/gcc/COPYING.RUNTIME’: No such file or directory
=> sweet, remove it

error: failed to commit transaction (conflicting files)
gcc: /home/cross/i486-root/usr/lib/libstdc++.a exists in filesystem (owned by gcc-libs)
gcc: /home/cross/i486-root/usr/lib/libstdc++.la exists in filesystem (owned by gcc-libs)
Errors occurred, no packages were upgraded.
=> well, force the package

test.c:1:10: fatal error: stdio.h: No such file or directory

# sed
#####
# gettext: take the one from the host
sed -i 's@makedepends\(.*\)@#makedepends\1@g' sed/PKGBUILD

# fakeroot
##########
# disable makedepends and take out po4a
# checkdepends use shareutils

# make
######
# no guile
sed -i 's@makedepends\(.*\)@#makedepends\1@g' make/PKGBUILD
# remove guile, guile patching as it needs autotools!

# libffi
#######
sed -i 's@checkdepends\(.*\)@#checkdepends\1@g' libffi/PKGBUILD

# glib2
#######
# take gettext from host
sed -i 's@makedepends\(.*\)@#makedepends\1@g' glib2/PKGBUILD
# get arch-meson wrapper, doens't build without it!
# ok, forget meson, completly broken, resorting to autotools.
# autoreconf: running: /home/cross/x-tools/i486-unknown-linux-gnu/bin/autoconf --force
# configure.ac:88: error: possibly undefined macro: AC_DEFINE
# huh?
# retooling seems to be near impossible! ok, autoconf broken, meson unusable.. sweet
Found pkg-config: /bin/pkg-config (0.27.1)
Dependency libpcre found: NO
Library m found: YES
Not looking for a fallback subproject for the dependency libffi because:
Automatic wrap-based fallback dependency downloading is disabled.

Meson encountered an error in file meson.build, line 1439, column 0:
Native dependency 'libffi' not found
==> ERROR: A failure occurred in build().
    Aborting...
=> this is all very wrong!

# gettext
#########
# remove glib2 from depends, not needed (why the hell is there anyway then?!?! just for fun?)

# libarchive calls autoreconf, this is quite annoying as perl in crosstool-nt or
###
# stil in phase two, no proper autotools, let's apply the out-of-chroot trick once more..
# do the autoreconf -fi outside, create a package libarchive-3.3.2-retooled.tgz
# libarchive has trouble with wchar_t (and has quite some other trouble around autoconf it seems)
# remove the wchar_t and wchar_t sizeof test in configure.ac manutally before retooling
# and of course tests fail!
# no checks again
sed -i "s@^source=.*@source=('libarchive-3.3.2-retooled.tgz')@g" libarchive/PKGBUILD
sed -i "s@^sha256sums=.*@sha256sums=('1f856e6f5cc0e1479f381e381a031ba19d09f80b51ac88e74b2c140fc78606e8')@g" libarchive/PKGBUILD
sed -i 's@autoreconf@#autoreconf@g' libarchive/PKGBUILD

# generic build
###############

# some binaries in the cross tools (also known as perl) have really
# weird library pathes (and no rpath it seems)
export LD_LIBRARY_PATH=/home/cross/x-tools/i486-unknown-linux-gnu/i486-unknown-linux-gnu/sysroot/usr/lib/:/home/cross/x-tools/i486-unknown-linux-gnu/i486-unknown-linux-gnu/sysroot/usr/lib/perl5/5.26/core_perl/CORE
export PATH=/home/cross/x-tools/i486-unknown-linux-gnu/i486-unknown-linux-gnu/sysroot/bin:/home/cross/x-tools/i486-unknown-linux-gnu/i486-unknown-linux-gnu/sysroot/usr/bin:${PATH}
for p in $PACKAGES
	cd $p
	sed -i "s/^arch=.*/arch=('i486')/" PKGBUILD

	# for some packages we cannot execute tests (because the dependencies to install in
	# the toolchain environment would be too much)
	# perl: --nocheck
	# openssl: --nocheck
	# expat: --nocheck
	# lz4: --nocheck
	# autoconf: --nocheck
	# automake: --nockeck
	# libarchive: --nocheck
	# pacman: --nocheck
	# util-linux: --nocheck
	# pcre: --nocheck
	# findutils: --nocheck
	# mpfr: --nocheck

	# some package break in parallel builds or produce really funky
	# error messages or/and results
	# binutils: use makepkg-noparallel.conf
        # gcc: use makepkg-noparallel.conf for debuging, the real build works fine in parallel

	makepkg -C --config $STAGE1_CHROOT/etc/makepkg.conf --skipchecksums --skippgpcheck > $p.log 2>&1
	
	cp -v *.pkg.tar.gz $STAGE1_CHROOT/packages/i486/.

# if things are messed up
#	rm -rf $STAGE1_CHROOT/packages/i486/temp* $STAGE1_CHROOT/var/cache/pacman/pkg/*
#	repo-add $STAGE1_CHROOT/packages/i486/temp.db.tar.gz $STAGE1_CHROOT/packages/i486/*pkg.tar.gz

	repo-add -n $STAGE1_CHROOT/packages/i486/temp.db.tar.gz $STAGE1_CHROOT/packages/i486/*pkg.tar.gz

	sudo pacman --noconfirm --config $STAGE1_CHROOT/etc/pacman.conf -r $STAGE1_CHROOT -Syy $p

	pacman --config $STAGE1_CHROOT/etc/pacman.conf -r $STAGE1_CHROOT -Q | grep $p

	# for ncurses, readline for bash
	# gdbm and db for perl
	# openssl for linux
	# attr for acl
	# libarchive, autoreconf needs autotools/m4 and dependencies (crosstool-ng autotools are broken for me)\
	# libcap for coreutils
	# bzip2 for pcre
	# pcre for grep
	# libunistring for gettext
	# libffi for glib2
	pushd $HOME/x-tools/i486-unknown-linux-gnu/i486-unknown-linux-gnu/sysroot
	bsdtar xf $STAGE1_CHROOT/packages/i486/ncurses-6.0+20170902-3-i486.pkg.tar.gz
	bsdtar xf $STAGE1_CHROOT/packages/i486/readline-7.0.003-1-i486.pkg.tar.gz 
	bsdtar xf $STAGE1_CHROOT/packages/i486/gdbm-1.13-1-i486.pkg.tar.gz
	bsdtar xf $STAGE1_CHROOT/packages/i486/db-5.3.28-3-i486.pkg.tar.gz 
	bsdtar xf $STAGE1_CHROOT/packages/i486/perl-5.26.1-1-i486.pkg.tar.gz 
	bsdtar xf $STAGE1_CHROOT/packages/i486/openssl-1.1.0.g-1-i486.pkg.tar.gz
	bsdtar xf $STAGE1_CHROOT/packages/i486/attr-2.4.47-3-i486.pkg.tar.gz
	bsdtar xf $STAGE1_CHROOT/packages/i486/attr-2.4.47-3-i486.pkg.tar.gz
	bsdtar xf $STAGE1_CHROOT/packages/i486/expat-2.2.5-1-i486.pkg.tar.gz 
	bsdtar xf $STAGE1_CHROOT/packages/i486/lz4-1\:1.8.0-1-i486.pkg.tar.gz 
	bsdtar xf $STAGE1_CHROOT/packages/i486/xz-5.2.3-1-i486.pkg.tar.gz
	bsdtar xf $STAGE1_CHROOT/packages/i486/zlib-1\:1.2.11-2-i486.pkg.tar.gz
	bsdtar xf $STAGE1_CHROOT/packages/i486/m4-1.4.18-1-i486.pkg.tar.gz 
	bsdtar xf $STAGE1_CHROOT/packages/i486/gmp-6.1.2-1-i486.pkg.tar.gz
	bsdtar xf $STAGE1_CHROOT/packages/i486/mpfr-3.1.6.p1-1-i486.pkg.tar.gz 
	bsdtar xf $STAGE1_CHROOT/packages/i486/libmpc-1.0.3-2-i486.pkg.tar.gz
	bsdtar xf $STAGE1_CHROOT/packages/i486/gawk-4.1.4-2-i486.pkg.tar.gz 
	bsdtar xf $STAGE1_CHROOT/packages/i486/autoconf-2.69-4-any.pkg.tar.gz 
	bsdtar xf $STAGE1_CHROOT/packages/i486/automake-1.15.1-1-any.pkg.tar.gz 
	bsdtar xf $STAGE1_CHROOT/packages/i486/libarchive-3.3.2-1-i486.pkg.tar.gz 
	bsdtar xf $STAGE1_CHROOT/packages/i486/libcap-2.25-1-i486.pkg.tar.gz 
	bsdtar xf $STAGE1_CHROOT/packages/i486/bzip2-1.0.6-6-i486.pkg.tar.gz
	bsdtar xf $STAGE1_CHROOT/packages/i486/libffi-3.2.1-2-i486.pkg.tar.gz 
	bsdtar xf $STAGE1_CHROOT/packages/i486/libunistring-0.9.7-1-i486.pkg.tar.gz
	popd

	cd ..
done

testing:

# common issues
###############

bash, backspace and cursor keys are not working:
=> tty erase '^?'

# create CD ROM
###############

# no ramdisk, no modules, no fancy startup, just a shell script

sudo rm -rf isolinux
mkdir isolinux
sudo cp -a i486-root/* isolinux/.
sudo chown -R cross:cross isolinux/.
cd isolinux
mkdir boot/isolinux
# hda for K5
# hdb for virsh arch486
sudo chown cross:cross boot/isolinux/isolinux.cfg
cat >boot/isolinux/isolinux.cfg <<EOF
UI menu.c32
TIMEOUT 300
PROMPT 1
LABEL hda
	KERNEL /boot/vmlinuz-linux
	APPEND root=/dev/hda init=/sbin/init console=ttyS0 console=tty0'
LABEL hdb
	KERNEL /boot/vmlinuz-linux
	APPEND root=/dev/hdb init=/sbin/init console=ttyS0 console=tty0'
LABEL hdc
	KERNEL /boot/vmlinuz-linux
	APPEND root=/dev/hdc init=/sbin/init console=ttyS0 console=tty0'
LABEL hdd
	KERNEL /boot/vmlinuz-linux
	APPEND root=/dev/hdd init=/sbin/init console=ttyS0 console=tty0'
LABEL sr0
	KERNEL /boot/vmlinuz-linux
	APPEND root=/dev/sr0 init=/sbin/init console=ttyS0 console=tty0'
LABEL sr1
	KERNEL /boot/vmlinuz-linux
	APPEND root=/dev/sr1 init=/sbin/init console=ttyS0 console=tty0'
EOF
mkdir -p etc/init
cat >etc/init/boot <<EOF
#!/bin/sh
mount -t proc proc /proc
ln -s /proc/self/fd /dev/fd
mount -t sysfs sys /sys
mount -t tmpfs nodev,nosuid,size=4M /tmp
exec /usr/bin/bash
EOF
sudo chown -R root:root .
sudo chmod 0775 etc/init/boot
sudo cp /usr/lib/syslinux/bios/ldlinux.c32 boot/isolinux/.
sudo cp /usr/lib/syslinux/bios/menu.c32 boot/isolinux/.
sudo cp /usr/lib/syslinux/bios/libutil.c32 boot/isolinux/.
sudo cp /usr/lib/syslinux/bios/isolinux.bin boot/isolinux/.
sudo genisoimage -J -r -o ../arch486.iso -b boot/isolinux/isolinux.bin \
	-c boot/isolinux/boot.cat -input-charset UTF-8 -no-emul-boot \
	-boot-load-size 4 -boot-info-table -joliet-long .
cd ..

# create virtual HD
###################

rm -f arch486.img
qemu-img create arch486.img 4g
chmod 666 arch486.img
sudo /sbin/losetup /dev/loop2 arch486.img
sudo dd if=/dev/zero of=/dev/loop2 bs=512 count=32130
echo ';' | sudo /sbin/sfdisk --no-reread /dev/loop2
sudo sfdisk -A /dev/loop2 1
sudo partx --show /dev/loop2
sudo partx -v --add /dev/loop2
sudo mkfs.ext4 -O ^64bit /dev/loop2p1
sudo mount /dev/loop2p1 mnt
sudo cp -a i486-root/* mnt/.
sudo chown -R cross:cross mnt/.
cd mnt
mkdir boot/syslinux
echo 'default /boot/vmlinuz-linux root=/dev/hda1 init=/sbin/init console=ttyS0 console=tty0' \
	> boot/syslinux/syslinux.cfg
sudo dd bs=440 count=1 if=/usr/lib/syslinux/bios/mbr.bin of=/dev/loop2
cp /usr/lib/syslinux/bios/*.c32 boot/syslinux/.
sudo extlinux --install boot/syslinux/
mkdir -p etc/init
cat >etc/init/boot <<EOF
#!/bin/sh
mount -t proc proc /proc
ln -s /proc/self/fd /dev/fd
mkdir /dev/pts
mount -t devpts devpts /dev/pts
mount -t sysfs sys /sys
mount -o remount,rw /
ip link set up dev eth0
ip addr add 192.168.1.127/24 dev eth0
ip route add default via 192.168.1.1 dev eth0
/usr/sbin/sshd
exec /usr/bin/bash
EOF
cat > etc/resolv.conf <<EOF
nameserver 192.168.1.1
EOF
cat >> etc/group <<EOF
nobody:x:99:
EOF
cat >> etc/passwd <<EOF
nobody:x:99:99:nobody:/:/usr/bin/nologin
EOF
cat >> etc/ssh/sshd_config <<EOF
PermitRootLogin yes
EOF
ssh-keygen -b 2048 -t rsa -f etc/ssh/ssh_host_rsa_key -N ''
ssh-keygen -b 1024 -t dsa -f etc/ssh/ssh_host_dsa_key -N ''
ssh-keygen -b 521 -t ecdsa -f etc/ssh/ssh_host_ecdsa_key -N ''
ssh-keygen -b 2048 -t ed25519 -f etc/ssh/ssh_host_ed25519_key -N ''
chmod 0400 etc/ssh/ssh_host_*_key
mkdir root/.ssh
cp $HOME/.ssh/id_rsa.pub root/.ssh/authorized_keys
chmod 0700 root/.ssh
sudo chown -R root:root .
sudo chmod 0775 etc/init/boot
cd ..
sudo umount mnt
sudo partx -v --delete /dev/loop2
sudo losetup -d /dev/loop2


cat > mnt/test.c <<EOF
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int main( int argc, char *argv[] )
{
	puts( "hello" );
	exit( EXIT_SUCCESS );
}
EOF

cat > mnt/test.cpp <<EOF
#include <iostream>
#include <cstdlib>

int main( void )
{
	std::cout << "hello" << std::endl;
	std::exit( EXIT_FAILURE );
}
EOF


TODOS: in linux package makepkg
https://github.com/libarchive/libarchive/issues/411

https://rubenerd.com/sata-on-qemu/

/usr/libexec/qemu-kvm --enable-kvm -cpu 486 -m 32 -vnc 0.0.0.0:2 \
	-kernel linux/pkg/linux/boot/vmlinuz-linux \
	-append 'root=/dev/hda1 nomodeset init=/etc/rc console=ttyS0 console=tty0' \
	-cdrom /data/isos/arch486.iso -hda /data/libvirt/arch486.qcow2 -nographic

qemu-system-i386 --enable-kvm -cpu 486 -m 32 -cdrom /data/isos/arch486.iso \
	-hda /data/libvirt/arch486.qcow2 -curses -boot d \
	-netdev user,id=net0,net=10.0.0.0/24,host=10.0.0.2,dhcpstart=10.0.0.16,hostfwd=tcp::2222-:22 \
	-device rtl8139,netdev=net0

qemu-system-i386 --enable-kvm -cpu 486 -m 32 \
	-hda /home/cross/arch486.img -curses -boot d \
	-netdev user,id=net0,net=10.0.0.0/24,host=10.0.0.2,dhcpstart=10.0.0.16,hostfwd=tcp::2222-:22 \
	-device rtl8139,netdev=net0

# very funny: uvesafb: failed to execute /sbin/v86d
# Intel and ARM DRM modules:
# BUG: unable to handle kernel NULL pointer dereference at   (null)

# libarchive wants to autoretool, kick the author
# fails in:
==> Starting prepare()...
libtoolize: putting auxiliary files in AC_CONFIG_AUX_DIR, 'build/autoconf'.
libtoolize: copying file 'build/autoconf/ltmain.sh'
libtoolize: putting macros in AC_CONFIG_MACRO_DIRS, 'build/autoconf'.
libtoolize: copying file 'build/autoconf/libtool.m4'
libtoolize: copying file 'build/autoconf/ltoptions.m4'
libtoolize: copying file 'build/autoconf/ltsugar.m4'
libtoolize: copying file 'build/autoconf/ltversion.m4'
libtoolize: copying file 'build/autoconf/lt~obsolete.m4'
configure.ac:136: error: possibly undefined macro: AC_MSG_FAILURE
      If this token and others are legitimate, please use m4_pattern_allow.
      See the Autoconf documentation.
configure.ac:310: error: possibly undefined macro: AC_CHECK_LIB
autoreconf: /home/cross/x-tools/i486-unknown-linux-gnu/bin/autoconf failed with exit status: 1
==> ERROR: A failure occurred in prepare().
    Aborting...

librarchive: checking size of wchar_t... configure: error: in `/home/cross/build/libarchive/src/libarchive-3.3.2':
configure: error: cannot compute sizeof (wchar_t)
See `config.log' for more details
==> ERROR: A failure occurred in build().
    Aborting...
configure:13828: checking windows.h usability
configure:13828: gcc -c -O2 -pipe  conftest.c >&5
conftest.c:109:21: fatal error: windows.h: No such file or directory
 #include <windows.h>
                     ^
compilation terminated.
configure:13828: $? = 1
configure: failed program was:
| /* confdefs.h */
| #define PACKAGE_NAME "libarchive"
| #define PACKAGE_TARNAME "libarchive"
| #define PACKAGE_VERSION "3.3.2"
=> seriously!!

=> wchar_t on Linux, without probing?!

Centos 7:
Fatal Internal Error in libarchive: Out of memory
When building tar package

TODO:
ca-certificates for curl:
ERROR: ld.so: object 'libfakeroot-tcp.so' from LD_PRELOAD cannot be preloaded: ignored.
bsdtar: /lib/libc.so.6: version `GLIBC_2.25' not found (required by /home/cross/x-tools/i486-unknown-linux-gnu/i486-unknown-linux-gnu/sysroot/usr/lib/libexpat.so.1)
  -> Compressing package...
ERROR: ld.so: object 'libfakeroot-tcp.so' from LD_PRELOAD cannot be preloaded: ignored.
bsdtar: /lib/libc.so.6: version `GLIBC_2.25' not found (required by /home/cross/x-tools/i486-unknown-linux-gnu/i486-unknown-linux-gnu/sysroot/usr/lib/libexpat.so.1)
==> ERROR: Failed to create package file.
=> bsdtar, libexpat linked to host libc?
=> using the Centos 7 version for now, renamed bsdtar in x-tools so it cannot be found

util-linux:
###########
configure: error: /bin/sh config/config.sub \ failed
==> ERROR: A failure occurred in build().
    Aborting...

total mess in util-linux, the problem is "Stripping unneeded symbols from binaries and libraries"
in makepkg
mount: error while loading shared libraries: libmount.so.1: cannot open shared object file: No such file or directory
[root@xs13 /]# ldd /usr/lib/libmount.la 

and again, I don't seem to be able to compile a running pacman!
debug: returning error 6 from _alpm_db_register_sync : wrong or NULL argument passed
error: could not register 'temp' database (wrong or NULL argument passed)
error: no usable package repositories configured.
debug: unregistering database 'local'
=> pacman -Syy seems broken, put -U -R -Q work, this is enough to continue to build
   packages and to install them :-)


gcc aftermatch:

SPECFILE=`dirname $(gcc -print-libgcc-file-name)`/specs
gcc -dumpspecs > $SPECFILE
*cpp:
%{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT} -isystem/usr/include
=> C works

g++ -o test test.cpp
In file included from /usr/include/c++/7.2.0/ext/string_conversions.h:41:0,
                 from /usr/include/c++/7.2.0/bits/basic_string.h:6159,
                 from /usr/include/c++/7.2.0/string:52,
                 from /usr/include/c++/7.2.0/bits/locale_classes.h:40,
                 from /usr/include/c++/7.2.0/bits/ios_base.h:41,
                 from /usr/include/c++/7.2.0/ios:42,
                 from /usr/include/c++/7.2.0/ostream:38,
                 from /usr/include/c++/7.2.0/iostream:39,
                 from test.cpp:1:
/usr/include/c++/7.2.0/cstdlib:75:15: fatal error: stdlib.h: No such file or directory
 #include_next <stdlib.h>
               ^~~~~~~~~~
export CPLUS_INCLUDE_PATH=/usr/include/c++/7.2.0
=> doens't help

/etc/bash.bashrc:
PS1='(chroot) \u:\w\$ '

PHASE 2
#######

Test what we can build inside the chroot.
When we get all dependencies right, we go into the real environment (which is
i486 and thus not SMP and slow- ok, we could use distcc, but anyway)

Main problem: we have trouble to run fakeroot in a chroot
fakeroot: nested operation not yet supported
makepkf -F takes care of that (thanks for providing minial fakeroot support)
but pacman also takes an -F parameter
-> INFAKEROOT=1 in /usr/bin/makepkg

As pacman seems to have some trouble, we overwrite the temp packages inside
the chroot and replace the files on the filesystem forcefully:
error: could not register 'temp' database (wrong or NULL argument passed)

In this round don't skip dependencies and tests if possible.

cp pkg/arch-install-scripts/usr/bin/arch-chroot /usr/local/bin/.

arch-chroot /home/cross/i486-root/

# package specific things

# iana-etc:
download error https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xml
=> we miss /etc/ssl/certs/ca-certificates.crt from  ca-certificates-utils, we
   can copy it from an existing archlinux

# hack /usr/bin/makepkg, run_pacman again, this time set
# --config /etc/pacman-i486.conf -r /

# tzdata
/build/tzdata/PKGBUILD: line 25: zic: command not found
==> ERROR: A failure occurred in package().
    Aborting...
=> forgot zig in the shim

# ncurses
# dlsym errors and we don't have a C++ compiler (yet)
sed -i 's@./configure@./configure --without-dlsym@g' ncurses/PKGBUILD
sed -i 's@--with-cxx-binding --with-cxx-shared@--without-cxx  --without-cxx-binding --without-cxx-shared@g' ncurses/PKGBUILD

# perl
######
perl: warning: Please check that your locale settings:
        LANGUAGE = (unset),
        LC_ALL = (unset),
        LANG = "en_US.UTF-8"
    are supported and installed on your system.

# openssl
sed -i 's@i686@i486@g' openssl/PKGBUILD
sed -i 's@no-ssl3-method@no-sse2 no-ssl3-method@g' openssl/PKGBUILD

# xz
# with gcc 7.2 we get new errors
sed -i 's@--enable-werror@--disable-werror@g' xz/PKGBUILD

# help2man
# needs perl-locale-gettext, which needs gettext, which needs glib2
# which needs meson (so a big nogo currently!)
# obviously it builds also without gettext..
sed -i 's@^depends\(.*\)@#depends\1@g' help2man/PKGBUILD

# bc
# requires texinfo, is this part of base-devel?
# bootstrap --force
# no /usr/lib32
# ./fbc -c ./libmath.b </dev/null >libmath.h


# libelf 
########
In file included from /usr/include/error.h:52:0,
                 from xmalloc.c:33:
/usr/include/bits/error.h: In function 'error':
/usr/include/bits/error.h:40:5: error: format not a string literal, argument types not checked [-Werror=format-nonliteral]
     __error_noreturn (__status, __errnum, __format, __va_arg_pack ());
     ^~~~~~~~~~~~~~~~
=> -isystem in gcc specfile needed, not -I


# 
# libxml2
# go without icu for now, icu needs C++
# also, python bindings and git are not really needed
sed -i 's@^depends\(.*\)@#depends\1@g' libxml2/PKGBUILD
sed -i 's@^makedepends\(.*\)@#makedepends\1@g' libxml2/PKGBUILD
build()
{
  sed -i -e 's/ -shared / -Wl,-O1,--as-needed\0 /g' libtool
  make
}
sed -i 's@--with-icu@@' libxml2/PKGBUILD
# dito package
# really, what is it with people!
# take: ftp://xmlsoft.org/libxml2/libxml2-2.9.7.tar.gz
#source=(git+https://git.gnome.org/browse/libxml2#commit=$_commit
# no tests, c++ tests would fail
./configure: line 13042: syntax error near unexpected token `Z,zlib,'
./configure: line 13042: `    PKG_CHECK_MODULES(Z,zlib,'
==> ERROR: A failure occurred in build().
    Aborting...
-> zlib probing needs pkg-config, which is it's own disaster, so disable
zlib for now.
=> hack out the broken PKG_CHECK_MODULES out of configure!
-> same trick for LZMA (equally broken) and ICU
-> disable testing for now, either it takes long or it hangs

# libgcrypt
# download location broken, download by hand, adapt PKGBUILD

# libxslt: same disaster as libxml2
# no python, no check

# kmod: circular dependency on linux-headers, let's build
# linux/linux-headers correctly outside the chroot and install
# them here (at least linux-headers)
# gtk-doc draws in Gnome bullshit again
sed -i 's@^makedepends\(.*\)@#makedepends\1@g' kmod/PKGBUILD

# libtirpc: break the cyrcle with systemd (via krb5)
sed -i 's@^makedepends\(.*\)@#makedepends\1@g' libtirpc/PKGBUILD
sed -i 's@^depends\(.*\)@#depends\1@g' libtirpc/PKGBUILD
# configure: error: gssapi.h not found. Use --disable-gssapi, or install GSS-API.
# --disable-gssapi

# pam:
# dependency w3m is for documentation, let's remove it
rm: cannot remove '/build/pam/pkg/pam/usr/share/doc/Linux-PAM/sag-pam_userdb.html': No such file or directory
also remove section in PKGBUILD

# inetutils:
# disable checks

# iroute2
# trying with iptables, as iptables draws in tons of things
sed -i 's@^makedepends\(.*\)@#makedepends\1@g' iproute2/PKGBUILD
sed -i 's@^depends\(.*\)@#depends\1@g' iproute2/PKGBUILD

# bison
# --nocheck: fails miserably to compile tests (C++ missing?)

# linux-headers: fails hapilly and has tons of weird stuff in it
install: failed to access ‘/home/cross/build/linux/pkg/linux-headers/usr/lib/modules/4.13.13-1/build’: No such file or directory
_package-headers()
=>  mkdir -p "${_builddir}" everywhere, the problem is install -D on Centos, obviously broken!

# kmod
configure: error: The pkg-config script could not be found or is too old.  Make sure it
is in your PATH or set the PKG_CONFIG environment variable to the full
path to pkg-config.

Alternatively, you may set the environment variables liblzma_CFLAGS
and liblzma_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.

To get pkg-config, see <http://pkg-config.freedesktop.org/>.
See `config.log' for more details
==> ERROR: A failure occurred in build().
    Aborting...
=> let's try to set lzma ourselves or disable it, get around pkg-config probing
# no pkg-config, no docu, try to work around
sed -i 's@--enable-gtk-doc@--disable-gtk-doc@g' kmod/PKGBUILD
sed -i 's@./configure@liblzma_CFLAGS=-I/usr/include liblzma_LIBS=-llzma ./configure@g' kmod/PKGBUILD
sed -i 's@./configure@zlib_CFLAGS=-I/usr/include zlib_LIBS=-lz ./configure@g' kmod/PKGBUILD
=> ok heck: linking errors
sed -i 's@--with-xz@--without-xz@g' kmod/PKGBUILD
sed -i 's@--with-zlib@--without-zlib@g' kmod/PKGBUILD

# libidn
# --nocheck, testing hangs

# iputils
# remove git again
# no docu, hack out manually 
sed -i 's@^makedepends\(.*\)@#makedepends\1@g' iptuils/PKGBUILD

# perl-error
# no checks, needs perl test-pod
sed -i 's@^checkdepends\(.*\)@#checkdepends\1@g' perl-error/PKGBUILD


# shadow
# git treatment again.
# no docu
# --disable-man

# git
sed -i 's@^makedepends\(.*\)@#makedepends\1@g' git/PKGBUILD
# no make doc
# disable most things in build
# disable doc in install-doc
# NO_GETTEXT=1
# --nocheck
=> no luck

# lz4:
# git tweaking again, use 1.8.0 tarball

# tar:
# checking whether mknod can create fifo without root privileges... configure: error: in `/build/tar/src/tar-1.29':
# configure: error: you should not run configure as root (set FORCE_UNSAFE_CONFIGURE=1 in environment to bypass this check)
# See `config.log' for more details
=> oh, please, bugger off!
sed -i 's@./configure@FORCE_UNSAFE_CONFIGURE=1 ./configure@g' tar/PKGBUILD

#TODO:
# lz4
# git package again
sed -i 's@^makedepends\(.*\)@#makedepends\1@g' lz4/PKGBUILD

#TODO: cracklib util-linux e2fsprogs libldap keyutils krb5 they end in circlejerk with systemd!
# we will solve that later by building a non-systemd version and then bootstrapping first systemd
# git: out of reach for now, far too many dependencies
perl-error git

# for now we don't rebuild ca-certificates, we had to copy them funilly anyway, and it's
# just a bunch of certs. So, in phase 3 or 4 then..

# curl
######
# curl needs asciidoc and p11-kit, don't build them, use them from the host
sed -i 's@makedepends\(.*\)@#makedepends\1@g' curl/PKGBUILD
# build with minimal features, enough to make pacman download packages
sed -i 's@depends\(.*\)@depends=('ca-certificates' 'openssl' 'zlib')@g' curl/PKGBUILD
# zsh, perl is used to create a completion file for curl and zsh?
sed -i 's@--with-gssapi@--with-gssapi --without-zsh-functions-dir@g' curl/PKGBUILD

# pacman
########
# pacman's tests mostly fail on non-Archlinux, so skip them
# asciidoc is a makedepend, we can use the one on the host
sed -i 's@makedepends\(.*\)@#makedepends\1@g' pacman/PKGBUILD
sed -i 's@checkdepends\(.*\)@#checkdepends\1@g' pacman/PKGBUILD
# minimal dependencies, we don't sign anything yet
sed -i "s/'gpgme'//g" pacman/PKGBUILD
sed -i "s/'pacman-mirrorlist'//g" pacman/PKGBUILD
sed -i "s/'archlinux-keyring'//g" pacman/PKGBUILD
# we need pkg-config, otherwise pacman find libarchive in the wrong
# place, but pkg-config needs glib2 and glib2 is built using meson (urgh!)
# when we take the host version, lets patch the host pkgconfig file to
# use the sysroot of the toolchain
# we simply set LIBARCHIVE_CFLAGS and LIBARCHIVE_LIBS to get rid of pkg-config probing
sed -i 's@./configure@LIBARCHIVE_CFLAGS=-I/usr/include LIBARCHIVE_LIBS=-larchive ./configure@g' pacman/PKGBUILD
# --nocheck still, as we don't have python yet
# and of course :-)
sed -i 's/exit 1 # \$E_USER_ABORT/# exit 1 # $E_USER_ABORT/g' /home/cross/i486-root/usr/bin/makepkg
# TODO
install: cannot stat '/build/pacman/src/pacman.conf.i486': No such file or directory
==> ERROR: A failure occurred in package().
    Aborting...
=> use the /etc/pacman-i486.conf from the chroot as pacman.conf.i486 (we still have the temp
   repo and we force the Architecture)
sed -i "s/686)/486)/g" pacman/PKGBUILD
sed -i 's/mycarch="i686"/mycarch="i486")/g' pacman/PKGBUILD
sed -i 's/mychost="i686-pc-linux-gnu"/mychost="i486-pc-linux-gnu"/g' pacman/PKGBUILD
sed -i 's/myflags="-march=i686"/myflags=-march=i486/g' pacman/PKGBUILD

# coreutils
###########
sed -i 's@./configure@FORCE_UNSAFE_CONFIGURE=1 ./configure@g' coreutils/PKGBUILD

# zlib
######
strip: /lib/libz.so.1: no version information available (required by /lib/libbfd-2.29.1.so)
=> this is because some tools are built with other versions (toolchain vs. chroot)
=> so we must not install zlib before we rebuild binutils

# util-linux
############
# disable some dependencies on systemd, python, PAM (chfn_chsh)
# and other stuff we don't need
# libtool seems broken
sed -i 's@makedepends\(.*\)@#makedepends\1@g' PKGBUILD
sed -i 's@ \+depends\(.*\)@#depends\1@g' PKGBUILD
sed -i 's@--with-python=3@--without-python \\@g' PKGBUILD
sed -i '/--without-python/ a \ --without-systemd --without-systemdsystemunitdir' PKGBUILD
sed -i 's@./configure@./configure --host=i486-unknown-linux-gnu@g' PKGBUILD
sed -i '/--without-python \\/ a \ --disable-chfn-chsh \\' PKGBUILD
sed -i '/--without-python \\/ a \ --disable-shared --enable-static \\' PKGBUILD
sed -i 's@\(chmod 4755 "$pkgdir"/usr/bin/{newgrp,ch{sh,fn}}\)@#\1@g' PKGBUILD
sed -i "s@\(sed -i '/ListenStream.*\)@#\1@g" PKGBUILD
sed -i 's@\(rm "$pkgdir.*\)@#\1@g' PKGBUILD
# chgrp: chgrp: invalid group: 'tty'invalid group: 'tty'
# /etc/group belongs to filesystem, but has only a root entry when installed
=> filesystem package: post.install hook has not been executed (filesystem.install)
=> for now do it manually
groupadd -g 5 tty
# IMPORTANT DNAGER: the test suite is crazzy and destroys the host!! use --nocheck
# packaging generates tons of errors, lets hope, they are not critical.
# cp: omitting directory ‘/’
# => at least util-linux needs !strip OPTIONS (makepkg-i486.conf)
#rm "$pkgdir"/usr/lib/lib*.{a,so}*

# pcre
######
# no C++
sed -i 's@./configure@./configure --disable-cpp@g' pcre/PKGBUILD
# --nocheck as we have trouble to find shared libraries

# gmp
#####
# no C++
sed -i 's@--enable-cxx@--disable-cxx@g' gmp/PKGBUILD

# gawk
######
# we don't have a valid locale yet, disable NLS
# and disable testing
sed -i 's@./configure@./configure --disable-nls@g' PKGBUILD

# openssh
#########
# package suffers from featuritis
# remove ldns and kerberos5 support, keep libedit (as it's easy to build)
# ssh => not good, openssl <> unbound <> openssl cycle and mess
sed -i 's@^makedepends\(.*\)@#makedepends\1@g' PKGBUILD
sed -i 's@^depends\(.*\)@#depends\1@g' PKGBUILD
sed -i 's@--with-ldns@--without-ldns@g' PKGBUILD
sed -i 's@--with-kerberos5=/usr@--without-kerberos5@g' PKGBUILD
#ln: failed to create symbolic link '/build/openssh/pkg/openssh/usr/share/man/man1/slogin.1.gz': No such file or directory
sed -i 's@\(ln -sf ssh.1.gz.*\)@#\1@g' PKGBUILD

# git
#####
# manual PKGBUILD fix
# install: cannot stat 'contrib/credential/libsecret/git-credential-libsecret': No such file or directory
# => PKGBUILD is a mess, sorry!
# no asciidoc, as this needs python2
#asciidoc -b docbook -d manpage -f ../../Documentation/asciidoc.conf \
#        -agit_version=2.15.0  git-subtree.txt
# disable make install-doc
#make: pkg-config: Command not found
#make: pkg-config: Command not found
#make: Leaving directory '/build/git/src/git-2.15.0/contrib/subtree'
#mv: cannot stat '/build/git/pkg/git/usr/share/perl5/site_perl/Git/*': No such file or directory
=> hack away python, perl, systemd, contrib, docu and other things we don't need right now

git clone...
Cloning into 'strusBase'...
fatal: cannot run ssh: No such file or directory
fatal: unable to fork
fatal: Unable to find remote helper for 'https'
fatal: Unable to find remote helper for 'http'
=> we need ssh

# tcl
#####
# disable tests: cynical, disable unit tests of a software needed for testing

# autoconf
##########
# checks need fortan (wow. that package is old!)
# depends contains base-devel stuff?! diffutils
sed -i 's@makedepends\(.*\)@#makedepends\1@g' autoconf/PKGBUILD
sed -i 's@checkdepends\(.*\)@#checkdepends\1@g' autoconf/PKGBUILD
# not bad, but lets disable testing for now:
# ERROR: 455 tests were run,
# 5 failed (4 expected failures).
# 48 tests were skipped.

# automake
##########
# automake needs dejagnu for testing, not now, disabling checks
sed -i 's@checkdepends\(.*\)@#checkdepends\1@g' automake/PKGBUILD
# TOTAL: 2901
# PASS:  2673
# SKIP:  164
# XFAIL: 41
# FAIL:  21
# XPASS: 0
# ERROR: 2
=> ok, but let's disable testing

# dejagnu
#########
# has hard-wired AC_PROG_CXX in configure, remove internal C++ tests
sed -i '/.\/configure/ i \  sed -i "s@AC_PROG_CXX@#AC_PROG_CXX@" configure.ac' dejagnu/PKGBUILD
sed -i '/configure.ac/ a \  sed -i "s@\\(unit_SOURCES.*\\)@#\\1@g" Makefile.am' dejagnu/PKGBUILD
sed -i '/configure.ac/ a \  sed -i "s@\\(check_PROGRAMS*\\)@#\\1@g" Makefile.am' dejagnu/PKGBUILD
sed -i '/Makefile.am/ a \  autoreconf' dejagnu/PKGBUILD

# wget
######
# no gnutls, no libpsl
sed -i 's@^depends\(.*\)@#depends\1@g' PKGBUILD
sed -i 's@--enable-nls@--disable-nls@g' PKGBUILD
sed -i 's@--with-ssl=gnutls@--with-ssl=openssl@g' PKGBUILD
sed -i '/.\/configure/ a \    --without-libpsl \\' PKGBUILD
# work around pkg-config
sed -i 's@./configure@OPENSSL_CFLAGS=-I/usr/include OPENSSL_LIBS="-lssl lcrypto" ./configure@g' PKGBUILD
# needs myriads of perl modules for testing => --nocheck
sed -i 's@^checkdepends\(.*\)@#checkdepends\1@g' PKGBUILD

# binutils
##########
# risky, risky
sed -i 's/glibc>=2.26/glib/g' binutils/PKGBUILD
# this is in gold, so let's disable gold! We don't have C++ (yet), so this should not matter..
sed -i 's@--enable-gold@--disable-gold@g' binutils/PKGBUILD

# libunwind
###########
# no TeX, no docu
sed -i 's@^makedepends\(.*\)@#makedepends\1@g' libunwind/PKGBUILD


# TODO: gcc
#####
TODO:
sed -i 's@^makedepends\(.*\)@#makedepends\1@g' binutils/PKGBUILD
sed -i 's@^checkdepends\(.*\)@#checkdepends\1@g' binutils/PKGBUILD
sed -i 's@^depends\(.*\)@#depends\1@g' binutils/PKGBUILD

# gcc
#####
# no gcc-ada and doxygen
sed -i '/makedepend/ s/gcc-ada //g' gcc/PKGBUILD
sed -i '/makedepend/ s/doxygen //g' gcc/PKGBUILD
# avoid huge git checkouts
sed -i 's@git+https://gcc.gnu.org/git/gcc.git.*@ftp://ftp.mpi-sb.mpg.de/pub/gnu/mirror/gcc.gnu.org/pub/gcc/releases/${pkgname}-${pkgver}/${pkgname}-${pkgver}.tar.gz@' gcc/PKGBUILD
sed -i 's@cd gcc$@cd ${pkgname}-${pkgver}@g' gcc/PKGBUILD
sed -i 's@$srcdir/gcc/configure@$srcdir/${pkgname}-${pkgver}/configure@g' gcc/PKGBUILD
# we don't have a working C++ compiler right now, be must bootstrap
# doesn't work, we need c++ sind 4.8!
#sed -i '/--enable-shared/ a \      --enable-bootstrap \\' gcc/PKGBUILD
# remove ADA, we don't have (and will most likely never have a GNAT binary to
# bootstrap ADA itself), on the other hand, there is nothing using ADA anyway.
# at least not in packages/community
sed -i '/pkgname/ s/gcc-ada//g' gcc/PKGBUILD
sed -i '/enable-languages/ s/ada//g' gcc/PKGBUILD
# send bugs to the right place
sed -i 's@https://bugs.archlinux.org/@https://bugs.archlinux32.org/@g' gcc/PKGBUILD
# so, I don't know what GNU people call bootstrapping, but this definitely isn't for C!
/usr/include/c++/7.2.0/cstdlib:75:15: fatal error: stdlib.h: No such file or directory
=> let's try to fix the C++ compiler then..
# this is really really dangerous, let's hope, it works
=> find /usr/include/c++/7.2.0 -type f -exec sed -i 's/#include_next/#include/g' {} \;
# /build/gcc/src/gcc-7.2.0/libgo/testsuite/gotest: line 624: 28445 Killed                  ./a.out -test.short -test.timeout=${timeout}s "$@"
=> ok, enough, go without testing
==> Starting package_gcc-go()...
make: *** i486-pc-linux-gnu/libgo: No such file or directory.  Stop.
==> ERROR: A failure occurred in package_gcc-go().
    Aborting...
=> fails, oh well, nobody needs go :-)



only c language
no checkdepdns, makedepnds

why the hell, I switched off c++, so wy are still cpp probes being done!?
/lib/cpp hardcoded, seriosly!!
# in prepare()
ln -s ../bin/cpp /home/cross/x-tools/i486-unknown-linux-gnu/lib/cpp
find . -name configure -exec sed -i 's@/lib/cpp@/home/cross/x-tools/i486-unknown-linux-gnu/bin/cpp@g' {} \;

since 4.8 gcc is written in C++, fine. so we have to have a crosstool-ng C++ or
=> we add C++ to the crosstool-ng toolchain, easier and more secure

 included from /home/cross/build/gcc/src/gcc-7.2.0/gcc/genmddeps.c:19:0:
/home/cross/build/gcc/src/gcc-7.2.0/gcc/system.h:540:34: error: declaration of C function ‘const cha
r* strsignal(int)’ conflicts with
 extern const char *strsignal (int);
                                  ^
In file included from /usr/include/c++/4.8.2/cstring:42:0,
                 from /home/cross/build/gcc/src/gcc-7.2.0/gcc/system.h:235,
                 from /home/cross/build/gcc/src/gcc-7.2.0/gcc/genmddeps.c:19:
/usr/include/string.h:562:14: error: previous declaration ‘char* strsignal(int)’ here
 extern char *strsignal (int __sig) __THROW;             ^
In file included from ./bconfig.h:5:0,
=> so, we get to an end here, c++ is taken from the host while cross-compiling?!
-> remove glibc-devel on the host!
-> draw the g++ link, autoconf fails in gcc in funny ways (not finding uint64_t)
-> carefull, we build a gcc over a crossng-gcc, not sure, this is supported..
-> aha. if mpfr, mpc and gmp are not installed and taken from sysroot but from i486-root
   some pathes get messed up.

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82590
https://www.mail-archive.com/gcc-bugs@gcc.gnu.org/msg550065.html
https://gcc.gnu.org/bugzilla/show_bug.cgi?format=multiple&id=54692

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65863
-> huh?
https://gcc.gnu.org/ml/gcc-help/2016-06/msg00016.html
- > yes, this is the inicatition I needed, mpfr, gmp and mpc point to a weird location

The stage one compiler doesn't find the shared library, o well:
/home/cross/build/gcc/src/gcc-build/./gcc/cc1: error while loading shared libraries: libmpc.so.3: cannot open shared object file: No such file or directory
-> export LD_LIBRARY_PATH=/home/cross/x-tools/i486-unknown-linux-gnu/i486-unknown-linux-gnu/sysroot/usr/lib

And it never ends:
In file included from /home/cross/build/gcc/src/gcc-7.2.0/libgcc/libgcc2.c:27:0:
/home/cross/build/gcc/src/gcc-7.2.0/libgcc/../gcc/tsystem.h:87:10: fatal error: stdio.h: No such file or directory
 #include <stdio.h>
          ^~~~~~~~~
compilation terminated.
make[2]: *** [Makefile:491: _muldi3.o] Error 1
-> https://gcc.gnu.org/ml/gcc-help/2012-04/msg00088.html
-> so, let's try giving it a --with-sysroot to the crosstool-ng dirs
-> and this means also it got past stage 1 compilers :-)

/home/cross/x-tools/i486-unknown-linux-gnu/lib/gcc/i486-unknown-linux-gnu/4.9.4/../../../../i486-unknown-linux-gnu/bin/ld: /home/cross/build/gcc/src/gcc-build/./gcc/liblto_plugin.so: error loading plugin: /home/cross/build/gcc/src/gcc-build/./gcc/liblto_plugin.so: wrong ELF class: ELFCLASS32
collect2: error: ld returned 1 exit status
make[2]: *** [Makefile:982: libgcc_s.so] Error 1
=> for now, remove LTO stuff in PKGBUILD

make: *** i486-unknown-linux-gnu/libstdc++-v3/doc: No such file or directory.  Stop.
==> ERROR: A failure occurred in build().
    Aborting...
=> remove the PKGBUILD line #  make -C $CHOST/libstdc++-v3/doc DESTDIR="$pkgdir" doc-install-man
libstdc++-v3/
=> # make documentation
  #make -C $CHOST/libstdc++-v3/doc doc-man-doxygen

install: failed to access ‘/home/cross/build/gcc/pkg/gcc/usr/lib/gcc/i486-unknown-linux-gnu/7.2.0/’: No such file or directory
=> gcc auto-probed itself into i486-pc-linux-gnu, so the installed files are there
CHOST="i486-pc-linux-gnu"    
make: Leaving directory '/home/cross/build/gcc/src/gcc-build/gcc'
install: failed to access ‘/home/cross/build/gcc/pkg/gcc/usr/lib/gcc/i486-unknown-linux-gnu/7.2.0/’: No such file or directory
=> sweet, let's try a symlink

_libdir=usr/lib/gcc/$CHOST/$pkgver
=> hard-code: to _libdir=usr/lib/gcc/i486-pc-linux-gnu/$pkgver
=> nope, now others break
this is hardly the ArchLinux way: vanilla and upstream

again CHOST set to  i486-pc-linux-gnu
=> this package is a disaster!
=> we have a mess with two CHOSTS, one for crosstool-ng (unknown) and
   one for our chroot

# remove traces of ADA
  rm "$pkgdir"/usr/share/info/{gccgo,gfortran.info}

# rm: cannot remove ‘/home/cross/build/gcc/pkg/gcc/usr/share/info/gccgo’: No such file or directory
#  rm "$pkgdir"/usr/share/info/{gccgo,gfortran.info}

/home/cross/x-tools/i486-unknown-linux-gnu/lib/gcc/i486-unknown-linux-gnu/4.9.4/../../../../i486-unknown-linux-gnu/bin/ld: cannot find -lquadmath
collect2: error: ld returned 1 exit status
libtool: install: error: relink `libgfortran.la' with the above command before installing it
make: *** [Makefile:1331: install-toolexeclibLTLIBRARIES] Error 1
make: Leaving directory '/home/cross/build/gcc/src/gcc-build/i486-unknown-linux-gnu/libgfortran'
==> ERROR: A failure occurred in package_gcc-libs().
    Aborting...
=> libquadmath must be retooled before libfortran
=> nope libfortran simply fails to relink => remove it

install: cannot stat ‘/home/cross/build/gcc/src/gcc/COPYING.RUNTIME’: No such file or directory
=> sweet, remove it

error: failed to commit transaction (conflicting files)
gcc: /home/cross/i486-root/usr/lib/libstdc++.a exists in filesystem (owned by gcc-libs)
gcc: /home/cross/i486-root/usr/lib/libstdc++.la exists in filesystem (owned by gcc-libs)
Errors occurred, no packages were upgraded.
=> well, force the package

test.c:1:10: fatal error: stdio.h: No such file or directory


# END TODO: gcc

# libtool
#########
# patched heavily again, git version cannot be bootstrapped use official tarball

# glibc
#######
# use 2.25 version, not 2.26. Keep the ABI intact!
# endless loop? gawk -f ../scripts/gen-as-const.awk pthread-pi-defines.sym \
# two reasons: clock and artifacts walk backwards or forward in time
# chroot on server with chroot, hard to have an asynchronous clock?
# or glibc is already installed on the system (where not?), so how the
# hell can it be possibly built!
# => oh, this would be cruel.
# or 3rd reason, we have a glibc shim, maybe this one causes some trouble
# => why?
# or libtool fixing, whatever fixing means (https://forums.gentoo.org/viewtopic-t-496052-start-0.html)
# => nope.
# -isystem /usr/includ ein gcc spec? quite likely!
# ah: old friend:
build/glibc/src/glibc-build/libc.a(dl-sysdep.o): In function `.L18':
dl-sysdep.c:(.text+0x8c): undefined reference to `__memcmp_ia32'
/build/glibc/src/glibc-build/libc.a(dl-sysdep.o): In function `.L87':
dl-sysdep.c:(.text+0x11f): undefined reference to `__memcmp_ia32'
/build/glibc/src/glibc-build/libc.a(dl-sysdep.o): In function `.L19':
dl-sysdep.c:(.text+0x152): undefined reference to `__memcmp_ia32'
/build/glibc/src/glibc-build/libc.a(dl-sysdep.o): In function `.L85':
dl-sysdep.c:(.text+0x19c): undefined reference to `__memcmp_ia32'
dl-sysdep.c:(.text+0x1b7): undefined reference to `__memcmp_ia32'
/build/glibc/src/glibc-build/libc.a(dl-sysdep.o):dl-sysdep.c:(.text+0x202): more undefined references to `__memcmp_ia32' follow
elf/sln
=> USE_MULTIARCH
=> --disable-multi-arch
=> let's test this time, too dangerous to loose the chroot otherwise!
# older 2.25 misses a binutils 2.29 patch:
https://git.busybox.net/buildroot/diff/package/glibc/0005-fix-binutils-2-29-build.patch?id=cf821efbd0b24690b52f379d4a9934a16073762e
{standard input}: Assembler messages:
{standard input}: Error: `loc1@GLIBC_2.0' can't be versioned to common symbol 'loc1'
{standard input}: Error: `loc2@GLIBC_2.0' can't be versioned to common symbol 'loc2'
{standard input}: Error: `locs@GLIBC_2.0' can't be versioned to common symbol 'locs'
make[2]: *** [../o-iterator.mk:9: /build/glibc/src/glibc-build/misc/regexp.os] Error 1

PACKAGES="iana-etc filesystem linux-api-headers tzdata ncurses readline bash \
gdbm perl openssl bzip2 xz m4 help2man flex bc elfutils \
libtool libxml2 libgpg-error libgcrypt libxslt \
docbook-xml docbook-xsl xmlto libcap libtirpc pambase pam inetutils bison iproute2 kmod \
sysfsutils libidn iputils \
expat acl attr lz4 tar libarchive curl pacman \
joe coreutils util-linux pcre grep findutils file diffutils ed patch \
autoconf automake libedit openssh pcre2 git libunwind strace wget \
gmp mpfr gawk libmpc zlib tcl expect dejagnu binutils gcc libtool glibc"
for p in $PACKAGES; do
	asp export $p   
done

for p in $PACKAGES
	cd $p

	sed -i "s/^arch=.*/arch=('i486')/" PKGBUILD

	# for some packages we cannot execute tests (because the dependencies to install in
	# the toolchain environment would be too much)
	# perl: --nocheck
	# openssl: --nocheck
	# libelf: --nocheck
	# libtool: --nocheck
	# libxml2: --nocheck
	# libxslt: --nocheck
	# inetutils: --nocheck
	# bison: --nocheck
	# libarchive: --nocheck
	# pacman: --nocheck
	# util-linux: --nocheck
	# pcre: --nocheck
	# gawk: --nocheck
	# tcl: --nocheck

	makepkg -C --config /etc/makepkg.conf --skipchecksums --skippgpcheck > $p.log 2>&1

	# TODO: 
	# some package break in parallel builds or produce really funky
	# error messages or/and results
	# binutils: use makepkg-noparallel.conf
        # gcc: use makepkg-noparallel.conf for debuging, the real build works fine in parallel
        
	cp -v *.pkg.tar.gz /packages/i486/.

	pacman --noconfirm --config /etc/pacman-i486.conf -U *.pkg.tar.gz 

	# replace all pacman articats and clean caches
	rm -rf /packages/i486/temp* /var/cache/pacman/pkg/*
	repo-add /packages/i486/temp.db.tar.gz /packages/i486/*pkg.tar.gz
	
	#repo-add -n /packages/i486/temp.db.tar.gz /packages/i486/*pkg.tar.gz

	pacman --noconfirm --config /etc/pacman-i486.conf -r / -S $p

	pacman --config /etc/pacman-i486.conf -r / -Q | grep $p
done

# aftermatch for gcc/binutils

#collect2: unable to find ld: this sounds bad, like an archicture mismatch somewhere
#in binutils/gcc
=> this is the cross compiled gcc for i486 inside the chroot, it expects
   its platform dependend stuff in /usr/lib/gcc/i486-unknown-linux-gnu/7.2.0
=> we can temporarily fix this:
ln -s /usr/bin/ld /usr/lib/gcc/i486-unknown-linux-gnu/7.2.0/ld
etc.

# libz.so missing?
ln -s libz.so.1 /usr/lib/libz.so

# aftermatch for glibc

# bacause pacman cannot set file permissions
chmod u+x /usr/bin/* /lib/*.so*

# kernel headers:
#/usr/include/linux/errno.h missing
#/usr/include/adm/errno.h missing
=> a libarchive compression issue, files missing, because they are in pkg of
  linux-api-headers?!

remove debug packages

error: failed to commit transaction (conflicting files)
/usr/lib/libstdc++.a exists in both 'gcc-libs' and 'gcc'
/usr/lib/libstdc++.la exists in both 'gcc-libs' and 'gcc'
/usr/lib/libblkid.a exists in both 'util-linux' and 'libutil-linux'
/usr/lib/libblkid.la exists in both 'util-linux' and 'libutil-linux'
/usr/lib/libfdisk.a exists in both 'util-linux' and 'libutil-linux'
/usr/lib/libfdisk.la exists in both 'util-linux' and 'libutil-linux'
/usr/lib/libmount.a exists in both 'util-linux' and 'libutil-linux'
/usr/lib/libmount.la exists in both 'util-linux' and 'libutil-linux'
/usr/lib/libsmartcols.a exists in both 'util-linux' and 'libutil-linux'
/usr/lib/libsmartcols.la exists in both 'util-linux' and 'libutil-linux'
/usr/lib/libuuid.a exists in both 'util-linux' and 'libutil-linux'
/usr/lib/libuuid.la exists in both 'util-linux' and 'libutil-linux'
Errors occurred, no packages were upgraded.

=> ok, we loose files and permissions

# in 'real' 486
###############

next round: do those problems persist

error: could not register 'temp' database (wrong or NULL argument passed)

installed binaries have wrong permissions (no execute permission), a pacman issue?
shilly flags? libarchive problem?

git: https helpers
chmod 0777 /usr/lib/git-core/git-remote-*

later: for inside the chroot

# uname module hack
###################

# as root
# we need i486, so setarch doesn't work for us, because it emulates only,
# a i686, use the hacked uname kernel module:
wget http://clfs.org/files/extras/uname_hack-20080713.tar.bz2
tar xf uname_hack-20080713.tar.bz2 
cd uname_hack
# swap memset arguments:
# /root/uname_hack/uname_hack.c:50:2: warning: 'memset' used with constant zero length parameter; this could be due to transposed parameters [-Wmemset-transposed-args]
#  memset(uname_hack_uts_machine, uname_hack_uts_machine_len, '\0');
#  ^~~~~~
#  Building modules, stage 2.
make uname_hack_fake_machine=i486
insmod  uname_hack.ko
#lib/config.guess in automake returns i486-pc-linux-gnu
# uname -m returns i486
cd ..

# patch our hosts pacman.conf, so it doesn't get fooled by the architecture hack
sed -i 's@^Architecture.*@Architecture = x86_64@g' /etc/pacman.conf

# optional packages for stage 1
# TODO: do we need this for old machines?
# linux-firmware
# use git from the host for now
#sed -i 's@makedepends\(.*\)@#makedepends\1@g' linux-firmware/PKGBUILD