diff options
Diffstat (limited to 'extra/llvm12/add-fno-semantic-interposition.patch')
| -rw-r--r-- | extra/llvm12/add-fno-semantic-interposition.patch | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/extra/llvm12/add-fno-semantic-interposition.patch b/extra/llvm12/add-fno-semantic-interposition.patch new file mode 100644 index 00000000..9edd3671 --- /dev/null +++ b/extra/llvm12/add-fno-semantic-interposition.patch @@ -0,0 +1,21 @@ +diff --git a/llvm/cmake/modules/HandleLLVMOptions.cmake b/llvm/cmake/modules/HandleLLVMOptions.cmake +--- a/llvm/cmake/modules/HandleLLVMOptions.cmake ++++ b/llvm/cmake/modules/HandleLLVMOptions.cmake +@@ -305,6 +305,17 @@ + # On Windows all code is PIC. MinGW warns if -fPIC is used. + else() + add_flag_or_print_warning("-fPIC" FPIC) ++ # Enable interprocedural optimizations for non-inline functions which would ++ # otherwise be disabled due to GCC -fPIC's default. ++ # ++ # Note: Clang allows IPO for -fPIC so this optimization is less effective. ++ # Older Clang may support -fno-semantic-interposition but it used local ++ # aliases to optimize global variables, which is incompatible with copy ++ # relocations due to -fno-pic. ++ if (CMAKE_COMPILER_IS_GNUCXX OR (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND ++ CMAKE_CXX_COMPILER_VERSION GREATER_EQUAL 13)) ++ add_flag_if_supported("-fno-semantic-interposition" FNO_SEMANTIC_INTERPOSITION) ++ endif() + endif() + # GCC for MIPS can miscompile LLVM due to PR37701. + if(CMAKE_COMPILER_IS_GNUCXX AND LLVM_NATIVE_ARCH STREQUAL "Mips" AND |