How to deal with "clang: error: unsupported option '-fopenmp'" on travis?

Question

I am currently trying to deploy a project using openmp. I have the flag '-fopenmp' on Travis.

How could I fix that ?

In local I just brew install libopenmp which solved the issue. But not on Travis, what are the options ?

Using cython I got the following ".travis.yml"

os: linux

dist: xenial

language: python

python:
  - "3.7"

cache: pip

addons:
  apt:
    packages:
      - patchelf

matrix:
  include:
  - os: osx
    # No version of Python is available via virtualenv on OS X workers, see https://github.com/travis-ci/travis-ci/issues/2312
    language: generic
    env: TOXENV=py37

  fast_finish: true

before_install:
  brew install libomp

install:
  - pip install --upgrade "pip < 19.1" -r CI/requirements.txt
  - python setup.py develop

script:
  - pytest

Travis fails while executing :

clang -fno-strict-aliasing -fno-common -dynamic -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -I/usr/local/include -I/usr/local/opt/openssl@1.1/include -I/usr/local/opt/sqlite/include -I/usr/local/Cellar/python@2/2.7.17/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c cpt/alphabet.c -o build/temp.macosx-10.13-x86_64-2.7/cpt/alphabet.o -fopenmp

While in local it compiles with python 3.7, how could I fix that aswell ?

score 12 · Accepted Answer · edited Jun 14 '23 at 19:26

12

On apple's llvm, -fopenmp is not supported. One should use brew's llvm.

The following commands will allow linking openmp:

brew install llvm libomp
export CC=/usr/local/opt/llvm/bin/clang

For reference, the issue where there are all the commands: https://github.com/bluesheeptoken/CPT/issues/68#issuecomment-563342866

edited Jun 14 '23 at 19:26

ijoseph

6,505
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answered Feb 03 '20 at 16:36

BlueSheepToken

5,751
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@gphilip what have you tried? What is your error? Might be worth opening a new post. You can tag me if you want. – BlueSheepToken Oct 22 '20 at 08:40
thank you! same exact error. Yes I tried the suggested solution. – gphilip Oct 22 '20 at 20:53
error: command '/usr/local/opt/llvm/bin/clang' failed: No such file or directory – ChrisDanger May 17 '23 at 02:16
1

@ChrisDanger one could be inspired by this script, working for both runners intel and arm https://github.com/bluesheeptoken/CPT/blob/master/CI/github/build_wheels.sh – BlueSheepToken May 17 '23 at 14:31

score -1 · Answer 2 · answered May 17 '23 at 02:55

-1

This is what worked for me on MacOS Ventura:

brew install llvm@11
LLVM_CONFIG="/opt/homebrew/Cellar/llvm@11/11.1.0_4/bin/llvm-config" pip install llvmlite
export CC=/opt/homebrew/Cellar/llvm@11/11.1.0_4/bin/clang

answered May 17 '23 at 02:55

ChrisDanger

1,071
11
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How to deal with "clang: error: unsupported option '-fopenmp'" on travis?

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