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Build and ship OpenMP with LLVM releases #160581

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459c213
Build and ship OpenMP with LLVM releases
luporl Sep 24, 2025
d94e854
Use LLVM_ENABLE_LIBCXX=ON to build the runtimes too
luporl Oct 2, 2025
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3 changes: 2 additions & 1 deletion clang/cmake/caches/Release.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -36,7 +36,7 @@ if (${CMAKE_HOST_SYSTEM_NAME} MATCHES "Linux")
list(APPEND DEFAULT_PROJECTS "bolt")
endif()

set (DEFAULT_RUNTIMES "compiler-rt;libcxx")
set (DEFAULT_RUNTIMES "compiler-rt;libcxx;openmp;flang-rt")
if (NOT WIN32)
list(APPEND DEFAULT_RUNTIMES "libcxxabi" "libunwind")
endif()
Expand Down Expand Up @@ -119,6 +119,7 @@ if (LLVM_RELEASE_ENABLE_LTO)
set_instrument_and_final_stage_var(LLVM_ENABLE_LLD "ON" BOOL)
endif()
set_instrument_and_final_stage_var(LLVM_ENABLE_LIBCXX "ON" BOOL)
set_instrument_and_final_stage_var(RUNTIMES_CMAKE_ARGS "-DLLVM_ENABLE_LIBCXX=ON" STRING)
set_instrument_and_final_stage_var(LLVM_STATIC_LINK_CXX_STDLIB "ON" BOOL)
set(RELEASE_LINKER_FLAGS "-rtlib=compiler-rt --unwindlib=libunwind")
if(NOT ${CMAKE_HOST_SYSTEM_NAME} MATCHES "Darwin")
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13 changes: 9 additions & 4 deletions openmp/libompd/src/CMakeLists.txt
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Expand Up @@ -11,16 +11,21 @@
project (libompd)
cmake_minimum_required(VERSION 3.20.0)

set(LIBOMPD_LD_STD_FLAGS FALSE CACHE BOOL
"Use -stdlibc++ instead of -libc++ library for C++ ")

set(LIBCXX_DEP)
if("libcxx" IN_LIST LLVM_ENABLE_RUNTIMES AND NOT ${LIBOMPD_LD_STD_FLAGS})
set(LIBCXX_DEP cxx)
endif()

add_library (ompd SHARED TargetValue.cpp omp-debug.cpp omp-state.cpp omp-icv.cpp)

# libompd must not link against libomp, there is no code dependency.
add_dependencies(ompd omp) # ensure generated import library is created first
add_dependencies(ompd omp ${LIBCXX_DEP}) # ensure generated import library is created first

set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")

set(LIBOMPD_LD_STD_FLAGS FALSE CACHE BOOL
"Use -stdlibc++ instead of -libc++ library for C++ ")

if(${LIBOMPD_LD_STD_FLAGS})
# Find and replace/add libstdc++ to compile flags
STRING( FIND "${CMAKE_CXX_FLAGS}" "-stdlib=libc++" OUT )
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