| Issue |
137472
|
| Summary |
[macOS] openmp fails to find pthread even though it's found by llvm
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
Phatcat
|
When compiling llvm from source with openmp:
```
(…)
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - found
-- Looking for pthread_rwlock_init in pthread
-- Looking for pthread_rwlock_init in pthread - found
-- Looking for pthread_mutex_lock in pthread
-- Looking for pthread_mutex_lock in pthread - found
(…)
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Success
-- Found Threads: TRUE
(…)
-- Looking for pthread_getname_np
-- Looking for pthread_getname_np - found
-- Looking for pthread_setname_np
-- Looking for pthread_setname_np - found
(…)
-- Check if compiler accepts -pthread
-- Check if compiler accepts -pthread - no
CMake Error at /Applications/CMake.app/Contents/share/cmake-4.0/Modules/FindPackageHandleStandardArgs.cmake:227 (message): Could NOT find Threads (missing: Threads_FOUND) Call Stack (most recent call first): /Applications/CMake.app/Contents/share/cmake-4.0/Modules/FindPackageHandleStandardArgs.cmake:591 (_FPHSA_FAILURE_MESSAGE) /Applications/CMake.app/Contents/share/cmake-4.0/Modules/FindThreads.cmake:226 (find_package_handle_standard_args) /Users/holsthein/llvm-project/openmp/runtime/cmake/config-ix.cmake:162 (find_package) /Users/holsthein/llvm-project/openmp/runtime/CMakeLists.txt:283 (include)
```
I then edited the FindThreads in Cmake to return true on apple without the flag and... I got this instead:
```
-- Looking for pthread_create in pthreads
-- Looking for pthread_create in pthreads - not found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - not found
-- Found Threads: TRUE
CMake Error at /Users/holsthein/llvm-project/openmp/runtime/cmake/LibompUtils.cmake:26 (message):
LIBOMP: Need pthread interface on Unix-like systems.
Call Stack (most recent call first):
/Users/holsthein/llvm-project/openmp/runtime/cmake/config-ix.cmake:169 (libomp_error_say)
/Users/holsthein/llvm-project/openmp/runtime/CMakeLists.txt:283 (include)
```
The way openmp is set up to look for and utilize threads on mac seems to be faulty?
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