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1# Check if the host compiler is new enough.2# These versions are updated based on the following policy:3# llvm.org/docs/DeveloperPolicy.html#toolchain4 5include(CheckCXXSourceCompiles)6 7set(GCC_MIN 7.4)8set(GCC_SOFT_ERROR 7.4)9set(CLANG_MIN 5.0)10set(CLANG_SOFT_ERROR 5.0)11set(APPLECLANG_MIN 10.0)12set(APPLECLANG_SOFT_ERROR 10.0)13 14# https://en.wikipedia.org/wiki/Microsoft_Visual_C#Internal_version_numbering15# _MSC_VER == 1928 MSVC++ 19.27 Visual Studio 2019 Version 16.8 + 16.916set(MSVC_MIN 19.28)17set(MSVC_SOFT_ERROR 19.28)18 19set(LIBSTDCXX_MIN 7)20set(LIBSTDCXX_SOFT_ERROR 7)21 22 23if(DEFINED LLVM_COMPILER_CHECKED)24 return()25endif()26set(LLVM_COMPILER_CHECKED ON)27 28if(LLVM_FORCE_USE_OLD_TOOLCHAIN)29 return()30endif()31 32function(check_compiler_version NAME NICE_NAME MINIMUM_VERSION SOFT_ERROR_VERSION)33 if(NOT CMAKE_CXX_COMPILER_ID STREQUAL NAME)34 return()35 endif()36 if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS MINIMUM_VERSION)37 message(FATAL_ERROR "Host ${NICE_NAME} version must be at least ${MINIMUM_VERSION}, your version is ${CMAKE_CXX_COMPILER_VERSION}.")38 elseif(CMAKE_CXX_COMPILER_VERSION VERSION_LESS SOFT_ERROR_VERSION)39 if(LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN)40 message(WARNING "Host ${NICE_NAME} version should be at least ${SOFT_ERROR_VERSION} because LLVM will soon use new C++ features which your toolchain version doesn't support. Your version is ${CMAKE_CXX_COMPILER_VERSION}. Ignoring because you've set LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN, but very soon your toolchain won't be supported.")41 else()42 message(FATAL_ERROR "Host ${NICE_NAME} version should be at least ${SOFT_ERROR_VERSION} because LLVM will soon use new C++ features which your toolchain version doesn't support. Your version is ${CMAKE_CXX_COMPILER_VERSION}. You can temporarily opt out using LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN, but very soon your toolchain won't be supported.")43 endif()44 endif()45endfunction(check_compiler_version)46 47check_compiler_version("GNU" "GCC" ${GCC_MIN} ${GCC_SOFT_ERROR})48check_compiler_version("Clang" "Clang" ${CLANG_MIN} ${CLANG_SOFT_ERROR})49check_compiler_version("AppleClang" "Apple Clang" ${APPLECLANG_MIN} ${APPLECLANG_SOFT_ERROR})50check_compiler_version("MSVC" "Visual Studio" ${MSVC_MIN} ${MSVC_SOFT_ERROR})51 52# See https://developercommunity.visualstudio.com/content/problem/845933/miscompile-boolean-condition-deduced-to-be-always.html53# and thread "[llvm-dev] Longstanding failing tests - clang-tidy, MachO, Polly"54# on llvm-dev Jan 21-23 2020.55if ((${CMAKE_CXX_COMPILER_ID} STREQUAL MSVC) AND56 (19.24 VERSION_LESS_EQUAL ${CMAKE_CXX_COMPILER_VERSION}) AND57 (${CMAKE_CXX_COMPILER_VERSION} VERSION_LESS 19.25))58 if(LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN)59 message(WARNING "Host Visual Studio version 16.4 is known to miscompile part of LLVM")60 else()61 message(FATAL_ERROR "Host Visual Studio version 16.4 is known to miscompile part of LLVM, please use clang-cl or upgrade to 16.5 or above (use -DLLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN=ON to ignore)")62 endif()63endif()64 65 66if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")67 if (CMAKE_CXX_SIMULATE_ID MATCHES "MSVC")68 if (CMAKE_CXX_SIMULATE_VERSION VERSION_LESS MSVC_MIN)69 message(FATAL_ERROR "Host Clang must have at least -fms-compatibility-version=${MSVC_MIN}, your version is ${CMAKE_CXX_SIMULATE_VERSION}.")70 endif()71 set(CLANG_CL 1)72 elseif(NOT LLVM_ENABLE_LIBCXX)73 # Test that we aren't using too old of a version of libstdc++.74 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})75 set(OLD_CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})76 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -std=c++0x")77 check_cxx_source_compiles("78#include <iosfwd>79#if defined(__GLIBCXX__)80#if !defined(_GLIBCXX_RELEASE) || _GLIBCXX_RELEASE < ${LIBSTDCXX_MIN}81#error Unsupported libstdc++ version82#endif83#endif84int main() { return 0; }85"86 LLVM_LIBSTDCXX_MIN)87 if(NOT LLVM_LIBSTDCXX_MIN)88 message(FATAL_ERROR "libstdc++ version must be at least ${GCC_MIN}.")89 endif()90 check_cxx_source_compiles("91#include <iosfwd>92#if defined(__GLIBCXX__)93#if !defined(_GLIBCXX_RELEASE) || _GLIBCXX_RELEASE < ${LIBSTDCXX_SOFT_ERROR}94#error Unsupported libstdc++ version95#endif96#endif97int main() { return 0; }98"99 LLVM_LIBSTDCXX_SOFT_ERROR)100 if(NOT LLVM_LIBSTDCXX_SOFT_ERROR)101 if(LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN)102 message(WARNING "libstdc++ version should be at least ${LIBSTDCXX_SOFT_ERROR} because LLVM will soon use new C++ features which your toolchain version doesn't support. Ignoring because you've set LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN, but very soon your toolchain won't be supported.")103 else()104 message(FATAL_ERROR "libstdc++ version should be at least ${LIBSTDCXX_SOFT_ERROR} because LLVM will soon use new C++ features which your toolchain version doesn't support. You can temporarily opt out using LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN, but very soon your toolchain won't be supported.")105 endif()106 endif()107 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})108 set(CMAKE_REQUIRED_LIBRARIES ${OLD_CMAKE_REQUIRED_LIBRARIES})109 endif()110endif()111