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llvm-project/llvm/cmake/modules/CheckCompilerVersion.cmake

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[docs] Increase minimum supported GCC version for building LLVM to 4.8 Summary: The RFC proposal sent to increase the minimum required GCC version to 4.8 received a lot of support. See the following thread: http://lists.llvm.org/pipermail/llvm-dev/2016-October/105955.html, This patch implements that by updating the docs. I believe the references to libstdc++ 4.7 issues can be removed as well, please let me know if that is not the case or if they should be updated a different way. Reviewers: rengolin Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D25683 llvm-svn: 284497
2016-10-19 01:17:37 +08:00
# Check if the host compiler is new enough. LLVM requires at least GCC 4.8,
[cmake] Check the compiler version first Otherwise users get messages from CheckAtomic about missing libatomic instead of a sensible message that says "use GCC 4.7 or newer". I structured the change along the lines of HandleLLVMStdlib.cmake, so that the standalone build of Clang still gets the compiler version check. Reviewers: beanz Differential Revision: http://reviews.llvm.org/D17789 llvm-svn: 262491
2016-03-03 00:42:56 +08:00
# MSVC 2013, or Clang 3.1.
cmake: include what you use Add a missing include. This is important in the case HandleLLVMOptions is included prior to the missing CheckCXXSourceCompiles or CheckCXXCompilerFlag which includes CheckCXXSourceCompiles. llvm-svn: 262949
2016-03-09 02:56:00 +08:00
include(CheckCXXSourceCompiles)
[cmake] Check the compiler version first Otherwise users get messages from CheckAtomic about missing libatomic instead of a sensible message that says "use GCC 4.7 or newer". I structured the change along the lines of HandleLLVMStdlib.cmake, so that the standalone build of Clang still gets the compiler version check. Reviewers: beanz Differential Revision: http://reviews.llvm.org/D17789 llvm-svn: 262491
2016-03-03 00:42:56 +08:00
if(NOT DEFINED LLVM_COMPILER_CHECKED)
set(LLVM_COMPILER_CHECKED ON)
if(NOT LLVM_FORCE_USE_OLD_TOOLCHAIN)
if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
[cmake] Temporarily revert enforcement of minimum GCC version increase Summary: This is temporary, until bot that builds public facing LLVM documentation is upgraded. It reverts only the cmake change in r284497, but leaves the doc changes in place to preserve intent. Reviewers: aaron.ballman Subscribers: mgorny, llvm-commits Differential Revision: https://reviews.llvm.org/D26078 llvm-svn: 285406
2016-10-28 23:30:27 +08:00
# FIXME: Change this to 4.8 once documentation builder bot is upgraded
if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.7)
message(FATAL_ERROR "Host GCC version must be at least 4.7!")
[cmake] Check the compiler version first Otherwise users get messages from CheckAtomic about missing libatomic instead of a sensible message that says "use GCC 4.7 or newer". I structured the change along the lines of HandleLLVMStdlib.cmake, so that the standalone build of Clang still gets the compiler version check. Reviewers: beanz Differential Revision: http://reviews.llvm.org/D17789 llvm-svn: 262491
2016-03-03 00:42:56 +08:00
endif()
elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.1)
message(FATAL_ERROR "Host Clang version must be at least 3.1!")
endif()
if (CMAKE_CXX_SIMULATE_ID MATCHES "MSVC")
if (CMAKE_CXX_SIMULATE_VERSION VERSION_LESS 18.0)
message(FATAL_ERROR "Host Clang must have at least -fms-compatibility-version=18.0")
endif()
set(CLANG_CL 1)
elseif(NOT LLVM_ENABLE_LIBCXX)
# Otherwise, 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 "-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)
[cmake] Temporarily revert enforcement of minimum GCC version increase Summary: This is temporary, until bot that builds public facing LLVM documentation is upgraded. It reverts only the cmake change in r284497, but leaves the doc changes in place to preserve intent. Reviewers: aaron.ballman Subscribers: mgorny, llvm-commits Differential Revision: https://reviews.llvm.org/D26078 llvm-svn: 285406
2016-10-28 23:30:27 +08:00
# FIXME: Change this to 4.8 once documentation builder bot is upgraded
message(FATAL_ERROR "Host Clang must be able to find libstdc++4.7 or newer!")
[cmake] Check the compiler version first Otherwise users get messages from CheckAtomic about missing libatomic instead of a sensible message that says "use GCC 4.7 or newer". I structured the change along the lines of HandleLLVMStdlib.cmake, so that the standalone build of Clang still gets the compiler version check. Reviewers: beanz Differential Revision: http://reviews.llvm.org/D17789 llvm-svn: 262491
2016-03-03 00:42:56 +08:00
endif()
set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
set(CMAKE_REQUIRED_LIBRARIES ${OLD_CMAKE_REQUIRED_LIBRARIES})
endif()
elseif(CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 18.0)
message(FATAL_ERROR "Host Visual Studio must be at least 2013")
elseif(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 18.0.31101)
message(WARNING "Host Visual Studio should at least be 2013 Update 4 (MSVC 18.0.31101)"
" due to miscompiles from earlier versions")
endif()
endif()
endif()
endif()