================
@@ -291,10 +291,13 @@ option(LIBCXX_HAS_EXTERNAL_THREAD_API
"Build libc++ with an externalized threading API.
This option may only be set to ON when LIBCXX_ENABLE_THREADS=ON." OFF)
-if (LIBCXX_ENABLE_THREADS)
- set(LIBCXX_PSTL_CPU_BACKEND "std_thread" CACHE STRING "Which PSTL CPU
backend to use")
-else()
- set(LIBCXX_PSTL_CPU_BACKEND "serial" CACHE STRING "Which PSTL CPU backend to
use")
+set(LIBCXX_PSTL_BACKEND "openmp" CACHE INTERNAL "Which PSTL backend to use")
+if (LIBCXX_PSTL_BACKEND STREQUAL "")
+ if (LIBCXX_ENABLE_THREADS)
+ set(LIBCXX_PSTL_BACKEND "std-thread")
+ else()
+ set(LIBCXX_PSTL_BACKEND "serial")
+ endif()
----------------
ldionne wrote:
I think I would do something like:
```
if (LIBCXX_ENABLE_THREADS)
set(LIBCXX_PSTL_BACKEND_DEFAULT "std-thread")
else()
set(LIBCXX_PSTL_BACKEND_DEFAULT "serial")
endif()
set(LIBCXX_PSTL_BACKEND "${LIBCXX_PSTL_BACKEND_DEFAULT}" CACHE STRING "Select
the PSTL backend to use. Valid values are serial, std-thread, ...., openmp.
Default: ${LIBCXX_PSTL_BACKEND_DEFAULT}")
```
https://github.com/llvm/llvm-project/pull/66968
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