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cmake: Don't do the libstdc++ version check when clang simulates MSVC

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If we're using clang-cl, that's a pretty good indication that we're
going to use MSVC's STL.

This simplifies the clang-cl ninja self-host configuration down to:
CC=clang-cl CXX=clang-cl cmake .. -GNinja

Modified version of zturner's patch:
Differential Revision: http://reviews.llvm.org/D7824

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230239 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Kleckner 2015-02-23 19:07:25 +00:00
parent 2bd4b63e7a
commit c38816e9d8
1 changed files with 9 additions and 5 deletions
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14
cmake/modules/HandleLLVMOptions.cmake
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@ -21,11 +21,15 @@ if(NOT LLVM_FORCE_USE_OLD_TOOLCHAIN)
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)
if (CMAKE_CXX_SIMULATE_ID MATCHES "MSVC")
if (CMAKE_CXX_SIMULATE_VERSION VERSION_LESS 18.0)
message(FATAL_ERROR "Host Clang must have at least -fms-compatibility-version=18.0")
endif()
elseif(NOT LLVM_ENABLE_LIBCXX)
# Otherwise, 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.
set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
set(OLD_CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
set(CMAKE_REQUIRED_FLAGS "-std=c++0x")