[PATCH] D49332: [CMake] Check -ffreestanding as C not C++ flag
Petr Hosek via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Fri Jul 13 18:01:55 PDT 2018
phosek created this revision.
phosek added reviewers: morehouse, vitalybuka.
Herald added subscribers: Sanitizers, llvm-commits, mgorny.
When -ffreestanding is used, main() isn't considered special and
when compiled as C++ code it'll get mangled which makes the
compilation fail since main() will be undefined so this check will
never succeed.
Repository:
rCRT Compiler Runtime
https://reviews.llvm.org/D49332
Files:
compiler-rt/cmake/config-ix.cmake
Index: compiler-rt/cmake/config-ix.cmake
===================================================================
--- compiler-rt/cmake/config-ix.cmake
+++ compiler-rt/cmake/config-ix.cmake
@@ -40,6 +40,7 @@
endif ()
# CodeGen options.
+check_c_compiler_flag(-ffreestanding COMPILER_RT_HAS_FFREESTANDING_FLAG)
check_cxx_compiler_flag(-fPIC COMPILER_RT_HAS_FPIC_FLAG)
check_cxx_compiler_flag(-fPIE COMPILER_RT_HAS_FPIE_FLAG)
check_cxx_compiler_flag(-fno-builtin COMPILER_RT_HAS_FNO_BUILTIN_FLAG)
@@ -51,7 +52,6 @@
check_cxx_compiler_flag(-fvisibility=hidden COMPILER_RT_HAS_FVISIBILITY_HIDDEN_FLAG)
check_cxx_compiler_flag(-frtti COMPILER_RT_HAS_FRTTI_FLAG)
check_cxx_compiler_flag(-fno-rtti COMPILER_RT_HAS_FNO_RTTI_FLAG)
-check_cxx_compiler_flag(-ffreestanding COMPILER_RT_HAS_FFREESTANDING_FLAG)
check_cxx_compiler_flag("-Werror -fno-function-sections" COMPILER_RT_HAS_FNO_FUNCTION_SECTIONS_FLAG)
check_cxx_compiler_flag(-std=c++11 COMPILER_RT_HAS_STD_CXX11_FLAG)
check_cxx_compiler_flag(-ftls-model=initial-exec COMPILER_RT_HAS_FTLS_MODEL_INITIAL_EXEC)
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