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[openmp][flang] To add a cmake option to build OPENMP Fortran modules only without building the libomp lib (#195576)

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PR #192687 Introduces a dependency to the Fortran intrinsic module when
building `openmp` Fortran modules, which requires a Flang enabled llvm
build in order to build `openmp` Fortran modules.

This PR is to add a cmake option `LIBOMP_FORTRAN_MODULES_ONLY` to allow
users to build 'openmp` Fortran modules only for Flang without building
the libomp runtime library.
This will allow libomp.a/so build still be independent from the Flang
build as before.

E.g. To build `openmp` Fortran modules only for Flang, one would need to
use the following options.
```
cmake \
...
  -DLIBOMP_FORTRAN_MODULES_ONLY=ON \
  -DLLVM_ENABLE_PROJECTS="flang" \
  -DLLVM_ENABLE_RUNTIMES="openmp" \
  ...
This commit is contained in:
Daniel Chen 2026-05-06 11:58:00 -04:00 committed by GitHub
parent 7062413448
commit dd145eb899
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1 changed files with 9 additions and 1 deletions
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10
openmp/CMakeLists.txt
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@ -109,6 +109,12 @@ set(LIBOMP_BUILD_DATE "No_Timestamp")
set(LIBOMP_FORTRAN_MODULES FALSE CACHE BOOL
"Create Fortran module files? (requires fortran compiler)")
option(LIBOMP_FORTRAN_MODULES_ONLY
"Build only Fortran modules without libomp runtime library" OFF)
if(LIBOMP_FORTRAN_MODULES_ONLY)
set(LIBOMP_FORTRAN_MODULES TRUE)
endif()
# Set up testing infrastructure.
include(OpenMPTesting)
@ -154,7 +160,9 @@ else()
# Build host runtime library, after LIBOMPTARGET variables are set since they
# are needed to enable time profiling support in the OpenMP runtime.
add_subdirectory(runtime)
if(NOT LIBOMP_FORTRAN_MODULES_ONLY)
add_subdirectory(runtime)
endif()
set(ENABLE_OMPT_TOOLS ON)
# Currently tools are not tested well on Windows or MacOS X.