106f32e7eSjoerg# Check if the host compiler is new enough. 206f32e7eSjoerg# These versions are updated based on the following policy: 306f32e7eSjoerg# llvm.org/docs/DeveloperPolicy.html#toolchain 406f32e7eSjoerg 506f32e7eSjoerginclude(CheckCXXSourceCompiles) 606f32e7eSjoerg 706f32e7eSjoergset(GCC_MIN 5.1) 806f32e7eSjoergset(GCC_SOFT_ERROR 5.1) 906f32e7eSjoergset(CLANG_MIN 3.5) 1006f32e7eSjoergset(CLANG_SOFT_ERROR 3.5) 1106f32e7eSjoergset(APPLECLANG_MIN 6.0) 1206f32e7eSjoergset(APPLECLANG_SOFT_ERROR 6.0) 1306f32e7eSjoerg 1406f32e7eSjoerg# https://en.wikipedia.org/wiki/Microsoft_Visual_C#Internal_version_numbering 15*da58b97aSjoerg# _MSC_VER == 1914 MSVC++ 14.14 (Visual Studio 2017 version 15.4) 16*da58b97aSjoergset(MSVC_MIN 19.14) 17*da58b97aSjoergset(MSVC_SOFT_ERROR 19.14) 1806f32e7eSjoerg 1906f32e7eSjoerg# Map the above GCC versions to dates: https://gcc.gnu.org/develop.html#timeline 2006f32e7eSjoergset(GCC_MIN_DATE 20150422) 2106f32e7eSjoergset(GCC_SOFT_ERROR_DATE 20150422) 2206f32e7eSjoerg 2306f32e7eSjoerg 2406f32e7eSjoergif(DEFINED LLVM_COMPILER_CHECKED) 2506f32e7eSjoerg return() 2606f32e7eSjoergendif() 2706f32e7eSjoergset(LLVM_COMPILER_CHECKED ON) 2806f32e7eSjoerg 2906f32e7eSjoergif(LLVM_FORCE_USE_OLD_TOOLCHAIN) 3006f32e7eSjoerg return() 3106f32e7eSjoergendif() 3206f32e7eSjoerg 3306f32e7eSjoergfunction(check_compiler_version NAME NICE_NAME MINIMUM_VERSION SOFT_ERROR_VERSION) 3406f32e7eSjoerg if(NOT CMAKE_CXX_COMPILER_ID STREQUAL NAME) 3506f32e7eSjoerg return() 3606f32e7eSjoerg endif() 3706f32e7eSjoerg if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS MINIMUM_VERSION) 3806f32e7eSjoerg message(FATAL_ERROR "Host ${NICE_NAME} version must be at least ${MINIMUM_VERSION}, your version is ${CMAKE_CXX_COMPILER_VERSION}.") 3906f32e7eSjoerg elseif(CMAKE_CXX_COMPILER_VERSION VERSION_LESS SOFT_ERROR_VERSION) 4006f32e7eSjoerg if(LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN) 4106f32e7eSjoerg 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.") 4206f32e7eSjoerg else() 4306f32e7eSjoerg 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.") 4406f32e7eSjoerg endif() 4506f32e7eSjoerg endif() 4606f32e7eSjoergendfunction(check_compiler_version) 4706f32e7eSjoerg 4806f32e7eSjoergcheck_compiler_version("GNU" "GCC" ${GCC_MIN} ${GCC_SOFT_ERROR}) 4906f32e7eSjoergcheck_compiler_version("Clang" "Clang" ${CLANG_MIN} ${CLANG_SOFT_ERROR}) 5006f32e7eSjoergcheck_compiler_version("AppleClang" "Apple Clang" ${APPLECLANG_MIN} ${APPLECLANG_SOFT_ERROR}) 5106f32e7eSjoergcheck_compiler_version("MSVC" "Visual Studio" ${MSVC_MIN} ${MSVC_SOFT_ERROR}) 5206f32e7eSjoerg 53*da58b97aSjoerg# See https://developercommunity.visualstudio.com/content/problem/845933/miscompile-boolean-condition-deduced-to-be-always.html 54*da58b97aSjoerg# and thread "[llvm-dev] Longstanding failing tests - clang-tidy, MachO, Polly" 55*da58b97aSjoerg# on llvm-dev Jan 21-23 2020. 56*da58b97aSjoergif ((${CMAKE_CXX_COMPILER_ID} STREQUAL MSVC) AND 57*da58b97aSjoerg (19.24 VERSION_LESS_EQUAL ${CMAKE_CXX_COMPILER_VERSION}) AND 58*da58b97aSjoerg (${CMAKE_CXX_COMPILER_VERSION} VERSION_LESS 19.25)) 59*da58b97aSjoerg if(LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN) 60*da58b97aSjoerg message(WARNING "Host Visual Studio version 16.4 is known to miscompile part of LLVM") 61*da58b97aSjoerg else() 62*da58b97aSjoerg 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)") 63*da58b97aSjoerg endif() 64*da58b97aSjoergendif() 65*da58b97aSjoerg 66*da58b97aSjoerg 6706f32e7eSjoergif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang") 6806f32e7eSjoerg if (CMAKE_CXX_SIMULATE_ID MATCHES "MSVC") 6906f32e7eSjoerg if (CMAKE_CXX_SIMULATE_VERSION VERSION_LESS MSVC_MIN) 7006f32e7eSjoerg message(FATAL_ERROR "Host Clang must have at least -fms-compatibility-version=${MSVC_MIN}, your version is ${CMAKE_CXX_SIMULATE_VERSION}.") 7106f32e7eSjoerg endif() 7206f32e7eSjoerg set(CLANG_CL 1) 7306f32e7eSjoerg elseif(NOT LLVM_ENABLE_LIBCXX) 7406f32e7eSjoerg # Test that we aren't using too old of a version of libstdc++. 7506f32e7eSjoerg set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) 7606f32e7eSjoerg set(OLD_CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES}) 7706f32e7eSjoerg set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -std=c++0x") 7806f32e7eSjoerg # Test for libstdc++ version of at least 4.8 by checking for _ZNKSt17bad_function_call4whatEv. 7906f32e7eSjoerg # Note: We should check _GLIBCXX_RELEASE when possible (i.e., for GCC 7.1 and up). 8006f32e7eSjoerg check_cxx_source_compiles(" 8106f32e7eSjoerg#include <iosfwd> 8206f32e7eSjoerg#if defined(__GLIBCXX__) 8306f32e7eSjoerg#if __GLIBCXX__ < ${GCC_MIN_DATE} 8406f32e7eSjoerg#error Unsupported libstdc++ version 8506f32e7eSjoerg#endif 8606f32e7eSjoerg#endif 8706f32e7eSjoerg#if defined(__GLIBCXX__) 8806f32e7eSjoergextern const char _ZNKSt17bad_function_call4whatEv[]; 8906f32e7eSjoergconst char *chk = _ZNKSt17bad_function_call4whatEv; 9006f32e7eSjoerg#else 9106f32e7eSjoergconst char *chk = \"\"; 9206f32e7eSjoerg#endif 9306f32e7eSjoergint main() { ++chk; return 0; } 9406f32e7eSjoerg" 9506f32e7eSjoerg LLVM_LIBSTDCXX_MIN) 9606f32e7eSjoerg if(NOT LLVM_LIBSTDCXX_MIN) 9706f32e7eSjoerg message(FATAL_ERROR "libstdc++ version must be at least ${GCC_MIN}.") 9806f32e7eSjoerg endif() 9906f32e7eSjoerg # Test for libstdc++ version of at least 5.1 by checking for std::iostream_category(). 10006f32e7eSjoerg # Note: We should check _GLIBCXX_RELEASE when possible (i.e., for GCC 7.1 and up). 10106f32e7eSjoerg check_cxx_source_compiles(" 10206f32e7eSjoerg#include <iosfwd> 10306f32e7eSjoerg#if defined(__GLIBCXX__) 10406f32e7eSjoerg#if __GLIBCXX__ < ${GCC_SOFT_ERROR_DATE} 10506f32e7eSjoerg#error Unsupported libstdc++ version 10606f32e7eSjoerg#endif 10706f32e7eSjoerg#endif 10806f32e7eSjoerg#if defined(__GLIBCXX__) 10906f32e7eSjoerg#include <ios> 11006f32e7eSjoergvoid foo(void) { (void) std::iostream_category(); } 11106f32e7eSjoerg#endif 11206f32e7eSjoergint main() { return 0; } 11306f32e7eSjoerg" 11406f32e7eSjoerg LLVM_LIBSTDCXX_SOFT_ERROR) 11506f32e7eSjoerg if(NOT LLVM_LIBSTDCXX_SOFT_ERROR) 11606f32e7eSjoerg if(LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN) 11706f32e7eSjoerg message(WARNING "libstdc++ version should be at least ${GCC_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.") 11806f32e7eSjoerg else() 11906f32e7eSjoerg message(FATAL_ERROR "libstdc++ version should be at least ${GCC_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.") 12006f32e7eSjoerg endif() 12106f32e7eSjoerg endif() 12206f32e7eSjoerg set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS}) 12306f32e7eSjoerg set(CMAKE_REQUIRED_LIBRARIES ${OLD_CMAKE_REQUIRED_LIBRARIES}) 12406f32e7eSjoerg endif() 12506f32e7eSjoergendif() 126