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[OpenMP] Fix clang-cl build error regarding TSX intrinsics 

Fix for https://bugs.llvm.org/show_bug.cgi?id=49339

The CMake check for the RTM intrinsics needs the -mrtm flag to be set
during the test. This way clang-cl correctly detects it has the
_xbegin() intrinsic. Otherwise, the CMake check fails.

Differential Revision: https://reviews.llvm.org/D97413
This commit is contained in:
Peyton, Jonathan L 2021-03-02 07:44:15 -06:00
parent 462cf39a5c
commit e83380fccc
1 changed files with 5 additions and 0 deletions
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5
openmp/runtime/cmake/config-ix.cmake
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@ -175,6 +175,10 @@ if (IA32 OR INTEL64)
}
int main() { int a = __kmp_umwait(0, 1000); return a; }")
check_cxx_source_compiles("${source_code}" LIBOMP_HAVE_WAITPKG_INTRINSICS)
set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
if (LIBOMP_HAVE_MRTM_FLAG)
set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -mrtm")
endif()
set(source_code "// check for attribute rtm and rtm intrinsics
#ifdef IMMINTRIN_H
#include <immintrin.h>
@ -191,6 +195,7 @@ if (IA32 OR INTEL64)
int main() { int a = __kmp_xbegin(); return a; }")
check_cxx_source_compiles("${source_code}" LIBOMP_HAVE_RTM_INTRINSICS)
set(CMAKE_REQUIRED_DEFINITIONS)
set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
endif()
# Find perl executable