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[CMake] Reland "Make simple source used for CMake checks a C file"

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The source being compiled is plain C, but using .cc extension forces it
to be compiled as C++ which requires a working C++ compiler including
C++ library which may not be the case when we're building compiler-rt
together with libcxx as part of runtimes build.

Differential Revision: https://reviews.llvm.org/D47031

llvm-svn: 332679
This commit is contained in:
Petr Hosek 2018-05-17 23:50:35 +00:00
parent 70a270da5f
commit 3eb71831e5
3 changed files with 6 additions and 1 deletions
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1
compiler-rt/CMakeLists.txt
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@ -145,6 +145,7 @@ if (SANITIZER_CXX_ABI STREQUAL "default")
set(SANITIZER_CXX_ABI_SYSTEM 1)
else()
set(SANITIZER_CXX_ABI_LIBNAME "libstdc++")
set(SANITIZER_CXX_ABI_SYSTEM 1)
endif()
else()
set(SANITIZER_CXX_ABI_LIBNAME "${SANITIZER_CXX_ABI}")

4
compiler-rt/cmake/Modules/CompilerRTUtils.cmake
View File

@ -144,8 +144,12 @@ macro(test_target_arch arch def)
endif()
set(SAVED_CMAKE_EXE_LINKER_FLAGS ${CMAKE_EXE_LINKER_FLAGS})
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${argstring}")
if(SANITIZER_CXX_ABI_SYSTEM)
set(FLAG_LINK_LIBRARIES ${SANITIZER_CXX_ABI_LIBRARY})
endif()
try_compile(CAN_TARGET_${arch} ${CMAKE_BINARY_DIR} ${SIMPLE_SOURCE}
COMPILE_DEFINITIONS "${TARGET_${arch}_CFLAGS} ${FLAG_NO_EXCEPTIONS}"
LINK_LIBRARIES ${FLAG_LINK_LIBRARIES}
OUTPUT_VARIABLE TARGET_${arch}_OUTPUT)
set(CMAKE_EXE_LINKER_FLAGS ${SAVED_CMAKE_EXE_LINKER_FLAGS})
endif()

2
compiler-rt/cmake/config-ix.cmake
View File

@ -125,7 +125,7 @@ set(COMPILER_RT_SUPPORTED_ARCH)
# platform. We use the results of these tests to build only the various target
# runtime libraries supported by our current compilers cross-compiling
# abilities.
set(SIMPLE_SOURCE ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/simple.cc)
set(SIMPLE_SOURCE ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/simple.c)
file(WRITE ${SIMPLE_SOURCE} "#include <stdlib.h>\n#include <stdio.h>\nint main() { printf(\"hello, world\"); }\n")
# Detect whether the current target platform is 32-bit or 64-bit, and setup