[PATCH] D123777: [CMake] Check for problematic MSVC + /arch:AVX configuration
Tobias Hieta via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Thu Apr 21 00:46:09 PDT 2022
thieta updated this revision to Diff 424114.
thieta added a comment.
Review fixes
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D123777/new/
https://reviews.llvm.org/D123777
Files:
llvm/cmake/config-ix.cmake
llvm/cmake/modules/CheckProblematicConfigurations.cmake
llvm/cmake/modules/HandleLLVMOptions.cmake
Index: llvm/cmake/modules/HandleLLVMOptions.cmake
===================================================================
--- llvm/cmake/modules/HandleLLVMOptions.cmake
+++ llvm/cmake/modules/HandleLLVMOptions.cmake
@@ -7,6 +7,7 @@
string(TOUPPER "${CMAKE_BUILD_TYPE}" uppercase_CMAKE_BUILD_TYPE)
include(CheckCompilerVersion)
+include(CheckProblematicConfigurations)
include(HandleLLVMStdlib)
include(CheckCCompilerFlag)
include(CheckCXXCompilerFlag)
Index: llvm/cmake/modules/CheckProblematicConfigurations.cmake
===================================================================
--- /dev/null
+++ llvm/cmake/modules/CheckProblematicConfigurations.cmake
@@ -0,0 +1,19 @@
+
+option(LLVM_ALLOW_PROBLEMATIC_CONFIGURATIONS OFF "Set this option to ON to allow problematic toolchain configurations. Use on your own risk.")
+
+macro(log_problematic MESSAGE)
+ if(LLVM_ALLOW_PROBLEMATIC_CONFIGURATIONS)
+ message(WARNING "${MESSAGE}")
+ else()
+ message(FATAL_ERROR "${MESSAGE}\nYou can force usage of this configuration by passing -DLLVM_ALLOW_PROBLEMATIC_CONFIGURATIONS=ON")
+ endif()
+endmacro()
+
+# MSVC and /arch:AVX is untested and have created problems before. See:
+# https://github.com/llvm/llvm-project/issues/54645
+if(${CMAKE_CXX_COMPILER_ID} STREQUAL MSVC)
+ string(TOLOWER "${CMAKE_CXX_FLAGS} ${CMAKE_C_FLAGS}" _FLAGS)
+ if(_FLAGS MATCHES "/arch:avx[0-9]*")
+ log_problematic("Compiling LLVM with MSVC and the /arch:AVX flag is known to cause issues with parts of LLVM.\nSee https://github.com/llvm/llvm-project/issues/54645 for details.\nUse clang-cl if you want to enable AVX instructions.")
+ endif()
+endif()
Index: llvm/cmake/config-ix.cmake
===================================================================
--- llvm/cmake/config-ix.cmake
+++ llvm/cmake/config-ix.cmake
@@ -12,6 +12,7 @@
include(CMakePushCheckState)
include(CheckCompilerVersion)
+include(CheckProblematicConfigurations)
include(HandleLLVMStdlib)
if( UNIX AND NOT (APPLE OR BEOS OR HAIKU) )
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