Bug#1006682: /usr/lib/cmake/mathgl2/MathGL2Config.cmake: Could NOT find OpenMP_CXX

[Sylvain Joubert]

Hi,
Here is the minimal CMakeLists.txt that reproduces the issue:

cmake_minimum_required(VERSION 3.22.0)
project(mgl_test LANGUAGES CXX)
find_package(MathGL2 REQUIRED)

If the packages libomp-dev and libomp-XX-dev that it drags (libomp-11-dev
on stable, libomp-14-dev on my testing setup) are not installed I get the
initial reported error.


Le mar. 30 août 2022 à 22:03, Rafael Laboissière <rafael at debian.org> a
écrit :

> Control: tags -1 moreinfo
>
> * Sylvain Joubert <joubert.sy at gmail.com> [2022-03-02 11:17]:
>
> >  Package: libmgl-dev
> >  Version: 8.0.1-1
> >  Severity: normal
> >
> > Dear Maintainer,
> >
> > Trying to use libmgl-dev through find_package(MathGL2) in CMake I'm
> facing the
> > following error:
> >
> >  CMake Error at
> /usr/share/cmake-3.22/Modules/FindPackageHandleStandardArgs.cmake:230
> >  (message): Could NOT find OpenMP_CXX (missing: OpenMP_CXX_FLAGS
> OpenMP_CXX_LIB_NAMES)
> >  Call Stack (most recent call first):
> >  /usr/share/cmake-3.22/Modules/FindPackageHandleStandardArgs.cmake:594
> >  (_FPHSA_FAILURE_MESSAGE)
> >   /usr/share/cmake-3.22/Modules/FindOpenMP.cmake:544
> >  (find_package_handle_standard_args)
> >   /usr/share/cmake-3.22/Modules/CMakeFindDependencyMacro.cmake:47
> >  (find_package)
> >   /usr/lib/cmake/mathgl2/MathGL2Config.cmake:22 (find_dependency)
> >  [...]
> >
> > It appears the libmgl-dev package is missing a dependency on an OpenMP
> > related package. Installing libomp-dev fixes the issue though I'm not
> > sure this is the correct package to depend on.
>
> Thank you for the bug report.
>
> Could you please provide an example that trigger the bug? For
> inspiration, look at Bug #1004218 [1] or #1004219 [2].
>
> Best,
>
> Rafael Laboissière
>
>   [1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1004218
>   [2] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1004219
>
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