libomp header file conflicts with gcc openmp compilation #112107
Description
brew gist-logs <formula> link OR brew config AND brew doctor output
HOMEBREW_VERSION: 3.6.3
ORIGIN: https://github.com/Homebrew/brew
HEAD: d5b6b068c15a8df60f0f5e34a4ca80dcf82c48e3
Last commit: 5 days ago
Core tap ORIGIN: https://github.com/Homebrew/homebrew-core
Core tap HEAD: 3d00b39d454e973773f178f5541b1f651912fa65
Core tap last commit: 30 hours ago
Core tap branch: master
HOMEBREW_PREFIX: /opt/homebrew
HOMEBREW_CASK_OPTS: []
HOMEBREW_DISPLAY: /private/tmp/com.apple.launchd.IKLaHGlLyB/org.xquartz:0
HOMEBREW_MAKE_JOBS: 10
Homebrew Ruby: 2.6.8 => /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/bin/ruby
CPU: 10-core 64-bit arm_firestorm_icestorm
Clang: 13.0.0 build 1300
Git: 2.32.0 => /Library/Developer/CommandLineTools/usr/bin/git
Curl: 7.77.0 => /usr/bin/curl
macOS: 12.0.1-arm64
CLT: 13.2.0.0.1.1638488800
Xcode: N/A
Rosetta 2: false
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Warning: Unbrewed header files were found in /usr/local/include.
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Unexpected header files:
/usr/local/include/spimage.h
/usr/local/include/spimage/colormap.h
/usr/local/include/spimage/cuda_util.h
/usr/local/include/spimage/fft.h
/usr/local/include/spimage/find_center.h
/usr/local/include/spimage/hashtable.h
/usr/local/include/spimage/image.h
/usr/local/include/spimage/image_filter.h
/usr/local/include/spimage/image_filter_cuda.h
/usr/local/include/spimage/image_io.h
/usr/local/include/spimage/image_noise.h
/usr/local/include/spimage/image_sphere.h
/usr/local/include/spimage/image_util.h
/usr/local/include/spimage/interpolation_kernels.h
/usr/local/include/spimage/linear_alg.h
/usr/local/include/spimage/list.h
/usr/local/include/spimage/map.h
/usr/local/include/spimage/mem_util.h
/usr/local/include/spimage/phasing.h
/usr/local/include/spimage/prtf.h
/usr/local/include/spimage/sperror.h
/usr/local/include/spimage/statistics.h
/usr/local/include/spimage/support_update.h
/usr/local/include/spimage/time_util.hVerification
- I ran
brew updateand am still able to reproduce my issue. - I have resolved all warnings from
brew doctorand that did not fix my problem.
What were you trying to do (and why)?
To be able to compile OpenMP programs with both clang and gcc on a system with libomp installed.
What happened (include all command output)?
libomp installs omp.h in /opt/homebrew/include/omp.h
When compiling an OpenMP program which includes omp.h with gcc and using other header files in /opt/homebrew/include/ gcc will use libomp's header file as it takes priority over gcc's built-in omp.h file.
But that header file is incompatible with gcc's libgomp resulting in a broken program.
You the same issue in this bug report for the libomp RPM package for Fedora.
I also came across this issue here.
What did you expect to happen?
The omp.h from libomp should not be used when compiling OpenMP code with gcc.
Step-by-step reproduction instructions (by running brew commands)
Here's a small example of the problem: https://gist.github.com/biochem-fan/31864239460769d2a4a3585e4959d298