2016-03-03 00:42:56 +08:00
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# Check if the host compiler is new enough. LLVM requires at least GCC 4.7,
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# MSVC 2013, or Clang 3.1.
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2016-03-09 02:56:00 +08:00
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include(CheckCXXSourceCompiles)
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2016-03-03 00:42:56 +08:00
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if(NOT DEFINED LLVM_COMPILER_CHECKED)
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set(LLVM_COMPILER_CHECKED ON)
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if(NOT LLVM_FORCE_USE_OLD_TOOLCHAIN)
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if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
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if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.7)
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message(FATAL_ERROR "Host GCC version must be at least 4.7!")
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endif()
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elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
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if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.1)
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message(FATAL_ERROR "Host Clang version must be at least 3.1!")
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endif()
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if (CMAKE_CXX_SIMULATE_ID MATCHES "MSVC")
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if (CMAKE_CXX_SIMULATE_VERSION VERSION_LESS 18.0)
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message(FATAL_ERROR "Host Clang must have at least -fms-compatibility-version=18.0")
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endif()
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set(CLANG_CL 1)
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elseif(NOT LLVM_ENABLE_LIBCXX)
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# Otherwise, test that we aren't using too old of a version of libstdc++
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# with the Clang compiler. This is tricky as there is no real way to
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# check the version of libstdc++ directly. Instead we test for a known
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# bug in libstdc++4.6 that is fixed in libstdc++4.7.
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set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
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set(OLD_CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
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set(CMAKE_REQUIRED_FLAGS "-std=c++0x")
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check_cxx_source_compiles("
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#include <atomic>
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std::atomic<float> x(0.0f);
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int main() { return (float)x; }"
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LLVM_NO_OLD_LIBSTDCXX)
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if(NOT LLVM_NO_OLD_LIBSTDCXX)
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message(FATAL_ERROR "Host Clang must be able to find libstdc++4.7 or newer!")
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endif()
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set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
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set(CMAKE_REQUIRED_LIBRARIES ${OLD_CMAKE_REQUIRED_LIBRARIES})
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endif()
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elseif(CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
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if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 18.0)
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message(FATAL_ERROR "Host Visual Studio must be at least 2013")
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elseif(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 18.0.31101)
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message(WARNING "Host Visual Studio should at least be 2013 Update 4 (MSVC 18.0.31101)"
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" due to miscompiles from earlier versions")
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endif()
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endif()
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endif()
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endif()
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