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Don't clobber CMAKE_REQUIRED_FLAGS, it ends up being used in

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C compilations as well and these flags don't make any sense there.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199756 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth 2014-01-21 18:09:19 +00:00
parent b422abd4be
commit 92e658b566
1 changed files with 4 additions and 0 deletions
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4
cmake/modules/HandleLLVMOptions.cmake
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@ -29,6 +29,8 @@ if(NOT LLVM_FORCE_USE_OLD_TOOLCHAIN)
# version of libstdc++ directly. Instead we test for a known bug in
# libstdc++4.6 that is fixed in libstdc++4.7.
if(NOT LLVM_ENABLE_LIBCXX)
set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
set(OLD_CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
set(CMAKE_REQUIRED_FLAGS "-std=c++0x")
if (ANDROID)
set(CMAKE_REQUIRED_LIBRARIES "atomic")
@ -41,6 +43,8 @@ int main() { return (float)x; }"
if(NOT LLVM_NO_OLD_LIBSTDCXX)
message(FATAL_ERROR "Host Clang must be able to find libstdc++4.7 or newer!")
endif()
set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
set(CMAKE_REQUIRED_LIBRARIES ${OLD_CMAKE_REQUIRED_LIBRARIES})
endif()
elseif(CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 17.0)