| # Check if the host compiler is new enough. |
| # These versions are updated based on the following policy: |
| # llvm.org/docs/DeveloperPolicy.html#toolchain |
| |
| include(CheckCXXSourceCompiles) |
| |
| set(GCC_MIN 4.8) |
| set(GCC_WARN 4.8) |
| set(CLANG_MIN 3.1) |
| set(CLANG_WARN 3.1) |
| set(APPLECLANG_MIN 3.1) |
| set(APPLECLANG_WARN 3.1) |
| set(MSVC_MIN 19.0) |
| set(MSVC_WARN 19.00.24213.1) |
| |
| if(DEFINED LLVM_COMPILER_CHECKED) |
| return() |
| endif() |
| set(LLVM_COMPILER_CHECKED ON) |
| |
| if(LLVM_FORCE_USE_OLD_TOOLCHAIN) |
| return() |
| endif() |
| |
| function(check_compiler_version NAME NICE_NAME MINIMUM_VERSION WARN_VERSION) |
| if(NOT CMAKE_CXX_COMPILER_ID STREQUAL NAME) |
| return() |
| endif() |
| if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS MINIMUM_VERSION) |
| message(FATAL_ERROR "Host ${NICE_NAME} version must be at least ${MINIMUM_VERSION}, your version is ${CMAKE_CXX_COMPILER_VERSION}.") |
| elseif(CMAKE_CXX_COMPILER_VERSION VERSION_LESS WARN_VERSION) |
| message(WARNING "Host ${NICE_NAME} version must be at least ${WARN_VERSION} due to miscompiles from earlier versions, your version is ${CMAKE_CXX_COMPILER_VERSION}.") |
| endif() |
| endfunction(check_compiler_version) |
| |
| check_compiler_version("GNU" "GCC" ${GCC_MIN} ${GCC_WARN}) |
| check_compiler_version("Clang" "Clang" ${CLANG_MIN} ${CLANG_WARN}) |
| check_compiler_version("AppleClang" "Apple Clang" ${APPLECLANG_MIN} ${APPLECLANG_WARN}) |
| check_compiler_version("MSVC" "Visual Studio" ${MSVC_MIN} ${MSVC_WARN}) |
| |
| if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang") |
| if (CMAKE_CXX_SIMULATE_ID MATCHES "MSVC") |
| if (CMAKE_CXX_SIMULATE_VERSION VERSION_LESS MSVC_MIN) |
| message(FATAL_ERROR "Host Clang must have at least -fms-compatibility-version=${MSVC_MIN}, your version is ${CMAKE_CXX_COMPILER_VERSION}.") |
| endif() |
| set(CLANG_CL 1) |
| elseif(NOT LLVM_ENABLE_LIBCXX) |
| # 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 ${CMAKE_REQUIRED_LIBRARIES}) |
| set(CMAKE_REQUIRED_FLAGS "${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++4.8 or newer!") |
| endif() |
| set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS}) |
| set(CMAKE_REQUIRED_LIBRARIES ${OLD_CMAKE_REQUIRED_LIBRARIES}) |
| endif() |
| endif() |