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# Check if the host compiler is new enough.
# These versions are updated based on the following policy:
# llvm.org/docs/GettingStarted.html#host-c-toolchain-both-compiler-and-standard-library
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()
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