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[NFC] Factor out + document build requirements
Summary: This change factors out compiler checking / warning, and documents LLVM_FORCE_USE_OLD_TOOLCHAIN. It doesn't introduce any functional changes nor policy changes, these will come late. Subscribers: mgorny, jkorous, dexonsmith, llvm-commits Differential Revision: https://reviews.llvm.org/D56799 llvm-svn: 351387
This commit is contained in:
JF Bastien
parent
47b1a19746
commit
36109c9464
@ -1,52 +1,66 @@
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# Check if the host compiler is new enough. LLVM requires at least GCC 4.8,
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# MSVC 2015 (Update 3), or Clang 3.1.
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# Check if the host compiler is new enough.
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# These versions are updated based on the following policy:
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# llvm.org/docs/GettingStarted.html#host-c-toolchain-both-compiler-and-standard-library
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include(CheckCXXSourceCompiles)
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if(NOT DEFINED LLVM_COMPILER_CHECKED)
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set(LLVM_COMPILER_CHECKED ON)
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set(GCC_MIN 4.8)
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set(GCC_WARN 4.8)
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set(CLANG_MIN 3.1)
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set(CLANG_WARN 3.1)
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set(APPLECLANG_MIN 3.1)
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set(APPLECLANG_WARN 3.1)
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set(MSVC_MIN 19.0)
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set(MSVC_WARN 19.00.24213.1)
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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 4.8)
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message(FATAL_ERROR "Host GCC version must be at least 4.8!")
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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(DEFINED LLVM_COMPILER_CHECKED)
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return()
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endif()
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set(LLVM_COMPILER_CHECKED ON)
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if (CMAKE_CXX_SIMULATE_ID MATCHES "MSVC")
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if (CMAKE_CXX_SIMULATE_VERSION VERSION_LESS 19.0)
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message(FATAL_ERROR "Host Clang must have at least -fms-compatibility-version=19.0")
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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 ${CMAKE_REQUIRED_LIBRARIES})
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set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -std=c++0x")
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check_cxx_source_compiles("
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if(LLVM_FORCE_USE_OLD_TOOLCHAIN)
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return()
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endif()
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function(check_compiler_version NAME NICE_NAME MINIMUM_VERSION WARN_VERSION)
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if(NOT CMAKE_CXX_COMPILER_ID STREQUAL NAME)
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return()
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endif()
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if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS MINIMUM_VERSION)
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message(FATAL_ERROR "Host ${NICE_NAME} version must be at least ${MINIMUM_VERSION}, your version is ${CMAKE_CXX_COMPILER_VERSION}.")
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elseif(CMAKE_CXX_COMPILER_VERSION VERSION_LESS WARN_VERSION)
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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}.")
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endif()
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endfunction(check_compiler_version)
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check_compiler_version("GNU" "GCC" ${GCC_MIN} ${GCC_WARN})
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check_compiler_version("Clang" "Clang" ${CLANG_MIN} ${CLANG_WARN})
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check_compiler_version("AppleClang" "Apple Clang" ${APPLECLANG_MIN} ${APPLECLANG_WARN})
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check_compiler_version("MSVC" "Visual Studio" ${MSVC_MIN} ${MSVC_WARN})
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if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
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if (CMAKE_CXX_SIMULATE_ID MATCHES "MSVC")
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if (CMAKE_CXX_SIMULATE_VERSION VERSION_LESS MSVC_MIN)
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message(FATAL_ERROR "Host Clang must have at least -fms-compatibility-version=${MSVC_MIN}, your version is ${CMAKE_CXX_COMPILER_VERSION}.")
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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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# 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 ${CMAKE_REQUIRED_LIBRARIES})
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set(CMAKE_REQUIRED_FLAGS "${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++4.8 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 19.0)
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message(FATAL_ERROR "Host Visual Studio must be at least 2015")
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elseif(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 19.00.24213.1)
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message(WARNING "Host Visual Studio should at least be 2015 Update 3 (MSVC 19.00.24213.1)"
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" due to miscompiles from earlier versions")
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endif()
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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++4.8 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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endif()
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@ -573,6 +573,11 @@ LLVM-specific variables
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options, which are passed to the CCACHE_MAXSIZE and CCACHE_DIR environment
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variables, respectively.
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**LLVM_FORCE_USE_OLD_TOOLCHAIN**:BOOL
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If enabled, the compiler and standard library versions won't be checked. LLVM
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may not compile at all, or might fail at runtime due to known bugs in these
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toolchains.
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CMake Caches
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============
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