Bug 771681 – sci-libs/gmsh-4.6.0[mpi,petsc] with petsc[-mpi]: error: conflicting declaration 'typedef int MPI_Comm'

• Product: Gentoo Linux
• Status: RESOLVED FIXED

[Description Bernd 2021-02-19 21:23:17 UTC]

My exact USE flag settings for the package are USE="blas cgns examples med metis mpi netgen opencascade petsc".

Removing either of mpi or petsc from USE flags let's the build succeed.

From my experience with other packages, I suppose we maybe need to pass the mpi USE flag to petsc to let the package build with both enabled.

artus /etc # emerge -pqv gmsh
[ebuild   R   ] sci-libs/gmsh-4.6.0  USE="X blas cgns examples jpeg med metis mpi netgen opencascade png python zlib -petsc" 


Reproducible: Always

Steps to Reproduce:
1. USE="mpi petsc" emerge sci-libs/gmsh
2.
3.



build log and emerge info as attachments.

[Comment 1 Bernd 2021-02-19 21:23:53 UTC]

Created attachment 687678 [details]
gmsh-4.6.0:20210219-203606.log

build log

[Comment 2 Bernd 2021-02-19 21:24:28 UTC]

Created attachment 687681 [details]
emerge-info-gmsh-4.6.0.txt

output of emerge --info sci-libs/gmsh

[Comment 3 Bernd 2021-02-19 22:56:43 UTC]

After hacking the sandbox issue from https://bugs.gentoo.org/721060#c7 and rebuilding sci-mathematics/petsc with USE=mpi, I can successfully build gmsh with both USE flags together.

[Comment 4 Ionen Wolkens 2021-02-19 23:00:51 UTC]

Can reproduce if have petsc with -mpi (works for me as well otherwise), so having petsc[mpi?] sounds right to me.

[Comment 5 Bernd 2021-02-20 09:40:24 UTC]

Agreed, that's what I actually meant in my initial report with 'pass[ing] the mpi USE flag to petsc'

[Comment 6 Matthias Maier 2021-02-20 16:23:37 UTC]

With USE=-mpi PETSc does use an internal "mpi.h" header file declaring some stub types. This makes it unfortunately incompatible with other libraries that rely on a correct "mpi.h".

The only way around this is to build PETSc with USE=mpi as well. I will add a use flag constraint to make this explicit.

[Comment 7 Larry the Git Cow 2021-04-09 18:26:47 UTC]

The bug has been closed via the following commit(s):

https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=8802d5c036f208bf430aadfc1d14e2dbcceffc97

commit 8802d5c036f208bf430aadfc1d14e2dbcceffc97
Author:     Matthias Maier <[e-mail]>
AuthorDate: 2021-04-09 16:30:47 +0000
Commit:     Matthias Maier <[e-mail]>
CommitDate: 2021-04-09 18:26:27 +0000

    sci-libs/gmsh: add a useflag constraint
    
    Closes: https://bugs.gentoo.org/771681
    Package-Manager: Portage-3.0.18, Repoman-3.0.3
    Signed-off-by: Matthias Maier <[e-mail]>

 sci-libs/gmsh/gmsh-4.6.0.ebuild | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)