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Add the test for libstdc++ versions newer than 4.6 so we don't

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accidentally pick that up while using Clang and run into subtle bugs
down the road related to C++11 features not fully implemented in that
version of the standard library.

llvm-svn: 199484
This commit is contained in:
Chandler Carruth 2014-01-17 09:47:55 +00:00
parent af93615a67
commit 17f8c3ba26
1 changed files with 16 additions and 0 deletions
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16
cmake/modules/HandleLLVMOptions.cmake
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@ -23,6 +23,22 @@ if(NOT LLVM_FORCE_USE_OLD_TOOLCHAIN)
if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.1)
message(FATAL_ERROR "Host Clang version must be at least 3.1!")
endif()
# Also test that we aren't using too old of a version of libstdc++ with the
# Clang compiler. This is tricky as there is no real way to check the
# 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(CMAKE_REQUIRED_FLAGS "-std=c++0x")
check_cxx_source_compiles("
#include <atomic>
std::atomic<float> x(0.0f);
int main() { return (float)x; }"
LLVM_NO_OLD_LIBSTDCXX)
if(NOT LLVM_NO_OLD_LIBSTDCXX)
message(FATAL_ERROR "Host Clang must be able to find libstdc++4.7 or newer!")
endif()
endif()
elseif(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 17.0)
message(FATAL_ERROR "Host Visual Studio must be at least 2012 (MSVC 17.0)")