Hi, ray fails to build on the architectures where the default MPI is now MPICH (armhf, i386). The current armhf and i386 binaries are older than that switch. Reproduced in a sid i386 chroot with libmpich-dev 5.0.2-2: Package mpi-c was not found in the pkg-config search path. Perhaps you should add the directory containing `mpi-c.pc' ... RayPlatform/RayPlatform/memory/DirtyBuffer.h:27:10: fatal error: mpi.h: No such file or directory d/rules gets the MPI flags from "pkg-config mpi-c". Only OpenMPI registers the mpi-c.pc alternative. MPICH only registers mpi.pc (the mpi-c/mpi-cxx/mpi-fort slaves are commented out in libmpich-dev.postinst). Both register mpi.pc and the libmpi.so alternative. The attached debdiff: - uses "pkg-config --cflags mpi" for the include path - links with -lmpi (the libmpi.so alternative) instead of "pkg-config --libs". mpich.pc's Libs: leaks MPICH's own build LDFLAGS. On Ubuntu, for example, that includes -Wl,--package-metadata for mpich, and the Ray binary ended up with mpich's package metadata note. On some architectures it also adds -lucc/-lze_loader/-lucp, which are not needed for linking ray. Tested: - sid i386 (MPICH 5.0.2, ch3:nemesis): 2.3.1-9 FTBFS. With the patch it builds, Ray links libmpich.so.12, and the autopkgtest passes, including the "mpiexec -n 2" run. - Ubuntu (OpenMPI default on amd64): builds, links libmpi.so.40, autopkgtest passes. It also builds with the mpi alternative switched to MPICH. The same change is being uploaded to Ubuntu, where the armhf build failure blocks ray in -proposed. Regards, Sebastien
Hello, Bug #1150815 in ray reported by you has been fixed in the Git repository and is awaiting an upload. You can see the commit message below and you can check the diff of the fix at: https://salsa.debian.org/med-team/ray/-/commit/6199468bebfb53ed03254bd913bd4f503c5cd207 ------------------------------------------------------------------------ Fix FTBFS on amd64 (OpenMPI) and MPICH architectures d/rules used 'pkg-config --libs mpi-c' which only OpenMPI registers, so the build failed on architectures where the default MPI is MPICH (armhf, i386) with 'mpi.h: No such file or directory' (Closes: #1150815). The proposed fix in #1150815 switched to 'pkg-config --cflags mpi' plus a bare '-lmpi'. That still broke amd64: with OpenMPI's split library layout the core symbols (e.g. ompi_mpi_byte) live in libopen_mpi, so a bare -lmpi fails with 'DSO missing from command line'. Query the generic 'mpi' pc file for the include path (both implementations register it) and keep 'pkg-config --libs mpi-c' (-> -lmpi -lopen_mpi) on OpenMPI, falling back to '-lmpi' on MPICH where mpich.pc leaks MPICH's own build LDFLAGS. ------------------------------------------------------------------------ (this message was generated automatically) -- Greetings https://bugs.debian.org/1150815
We believe that the bug you reported is fixed in the latest version of
ray, which is due to be installed in the Debian FTP archive.
A summary of the changes between this version and the previous one is
attached.
Thank you for reporting the bug, which will now be closed. If you
have further comments please address them to 1150815@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.
Debian distribution maintenance software
pp.
Andreas Tille <tille@debian.org> (supplier of updated ray package)
(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Sat, 17 Oct 2026 15:09:56 +0200
Source: ray
Architecture: source
Version: 2.3.1-10
Distribution: unstable
Urgency: medium
Maintainer: Debian Med Packaging Team <debian-med-packaging@lists.alioth.debian.org>
Changed-By: Andreas Tille <tille@debian.org>
Closes: 1150815
Changes:
ray (2.3.1-10) unstable; urgency=medium
.
* d/rules: fix the FTBFS on architectures where the default MPI is
MPICH (armhf, i386). (Closes: #1150815)
- Query pkg-config for "mpi" instead of "mpi-c", which only OpenMPI
registers, so mpi.h was not found with MPICH.
- Link with -lmpi on MPICH instead of "pkg-config --libs", as
mpich.pc leaks MPICH's own build LDFLAGS.
* d/rules: keep using "pkg-config --libs mpi-c" on OpenMPI
architectures (e.g. amd64). It expands to -lmpi -lopen_mpi, and the
latter is required with OpenMPI's split library layout (libmpi.so no
longer contains the core symbols); a bare -lmpi fails there with
"undefined reference to ompi_mpi_byte".
* d/watch: version=5
* Standards-Version: 4.7.4 (routine-update)
* Reflow Uploaders field (cme)
* Remove Priority field (cme)
* Drop 'Rules-Requires-Root: no' from d/control (routine-update)
* Reformat the Last-Update date as ISO YYYY-MM-DD.
* Set upstream metadata fields: Archive, Bug-Database.
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