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Tue, 13 Oct 2026 06:35:49 -0700 (PDT) X-Received: by 2002:a05:6512:33c9:b0:5b8:ec96:3bea with SMTP id 2adb3069b0e04-5bcde6bf74bmr4644293e87.20.1791898549037; Tue, 13 Oct 2026 06:35:49 -0700 (PDT) MIME-Version: 1.0 From: Sebastien Bacher <sebastien.bacher@canonical.com> Date: Tue, 13 Oct 2026 15:35:37 +0200 X-Gm-Features: AclHuK-syoqP6rT-t_f-NiCsAwp3jENrqgtWV1Jvuuj2nLa7tp_BAq6nwoueU0E Message-ID: <CAD04=wqc1PfzbE6ozQAoYZgSnVpfpi+V4Aiv_SsxzPWKFN+59A@mail.gmail.com> Subject: ray: FTBFS on MPICH architectures (armhf, i386): pkg-config mpi-c not found To: submit@bugs.debian.org Content-Type: multipart/mixed; boundary="0000000000007d610e065db8e41a" Delivered-To: submit@bugs.debian.org --0000000000007d610e065db8e41a Content-Type: multipart/alternative; boundary="0000000000007d610d065db8e418" --0000000000007d610d065db8e418 Content-Type: text/plain; charset="UTF-8" Source: ray Version: 2.3.1-9 Severity: serious Tags: ftbfs patch Justification: fails to build from source 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 --0000000000007d610d065db8e418 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr"><div>Source: ray<br>Version: 2.3.1-9<br>Severity: serious<= br>Tags: ftbfs patch<br>Justification: fails to build from source<br><br></= div><div>Hi,</div><br>ray fails to build on the architectures where the def= ault MPI is now<br>MPICH (armhf, i386). The current armhf and i386 binaries= are older than<br>that switch. Reproduced in a sid i386 chroot with libmpi= ch-dev 5.0.2-2:<br><br>=C2=A0 Package mpi-c was not found in the pkg-config= search path.<br>=C2=A0 Perhaps you should add the directory containing `mp= i-c.pc'<br>=C2=A0 ...<br>=C2=A0 RayPlatform/RayPlatform/memory/DirtyBuf= fer.h:27:10: fatal error: mpi.h: No such file or directory<br><br>d/rules g= ets the MPI flags from "pkg-config mpi-c". Only OpenMPI<br>regist= ers the mpi-c.pc alternative. MPICH only registers mpi.pc (the<br>mpi-c/mpi= -cxx/mpi-fort slaves are commented out in libmpich-dev.postinst).<br>Both r= egister mpi.pc and the libmpi.so alternative.<br><br>The attached debdiff:<= br><br>=C2=A0- uses "pkg-config --cflags mpi" for the include pat= h<br>=C2=A0- links with -lmpi (the libmpi.so alternative) instead of<br>=C2= =A0 =C2=A0"pkg-config --libs". mpich.pc's Libs: leaks MPICH&#= 39;s own build<br>=C2=A0 =C2=A0LDFLAGS. On Ubuntu, for example, that includ= es<br>=C2=A0 =C2=A0-Wl,--package-metadata for mpich, and the Ray binary end= ed up with<br>=C2=A0 =C2=A0mpich's package metadata note. On some archi= tectures it also adds<br>=C2=A0 =C2=A0-lucc/-lze_loader/-lucp, which are no= t needed for linking ray.<br><br>Tested:<br>=C2=A0- sid i386 (MPICH 5.0.2, = ch3:nemesis): 2.3.1-9 FTBFS. With the patch<br>=C2=A0 =C2=A0it builds, Ray = links libmpich.so.12, and the autopkgtest passes,<br>=C2=A0 =C2=A0including= the "mpiexec -n 2" run.<br>=C2=A0- Ubuntu (OpenMPI default on am= d64): builds, links libmpi.so.40,<br>=C2=A0 =C2=A0autopkgtest passes. It al= so builds with the mpi alternative switched<br>=C2=A0 =C2=A0to MPICH.<br><b= r>The same change is being uploaded to Ubuntu, where the armhf build<br>fai= lure blocks ray in -proposed.<br><br>Regards,<br>Sebastien<br><br></div> --0000000000007d610d065db8e418-- --0000000000007d610e065db8e41a Content-Type: application/octet-stream; name="ray_debian.debdiff" Content-Disposition: attachment; filename="ray_debian.debdiff" Content-Transfer-Encoding: base64 Content-ID: <f_mv6q4eo40> X-Attachment-Id: f_mv6q4eo40 ZGlmZiAtTnJ1IHJheS0yLjMuMS9kZWJpYW4vY2hhbmdlbG9nIHJheS0yLjMuMS9kZWJpYW4vY2hh bmdlbG9nCi0tLSByYXktMi4zLjEvZGViaWFuL2NoYW5nZWxvZwkyMDI0LTEyLTAyIDE2OjM3OjUx LjAwMDAwMDAwMCArMDEwMAorKysgcmF5LTIuMy4xL2RlYmlhbi9jaGFuZ2Vsb2cJMjAyNi0xMC0x MyAxMToxOTowNy4wMDAwMDAwMDAgKzAyMDAKQEAgLTEsMyArMSwxNSBAQAorcmF5ICgyLjMuMS0x MCkgVU5SRUxFQVNFRDsgdXJnZW5jeT1tZWRpdW0KKworICAqIGQvcnVsZXM6IGZpeCB0aGUgRlRC RlMgb24gYXJjaGl0ZWN0dXJlcyB3aGVyZSB0aGUgZGVmYXVsdCBNUEkgaXMKKyAgICBNUElDSCAo YXJtaGYsIGkzODYpLgorICAgIC0gUXVlcnkgcGtnLWNvbmZpZyBmb3IgIm1waSIgaW5zdGVhZCBv ZiAibXBpLWMiLCB3aGljaCBvbmx5IE9wZW5NUEkKKyAgICAgIHJlZ2lzdGVycywgc28gbXBpLmgg d2FzIG5vdCBmb3VuZCB3aXRoIE1QSUNILgorICAgIC0gTGluayB3aXRoIC1sbXBpICh0aGUgbGli bXBpLnNvIGFsdGVybmF0aXZlIGJvdGggaW1wbGVtZW50YXRpb25zCisgICAgICBwcm92aWRlKSBp bnN0ZWFkIG9mICJwa2ctY29uZmlnIC0tbGlicyIsIGFzIG1waWNoLnBjIGxlYWtzIE1QSUNIJ3MK KyAgICAgIG93biBidWlsZCBMREZMQUdTLgorCisgLS0gU2ViYXN0aWVuIEJhY2hlciA8c2ViMTI4 QHVidW50dS5jb20+ICBUdWUsIDEzIE9jdCAyMDI2IDExOjE5OjA3ICswMjAwCisKIHJheSAoMi4z LjEtOSkgdW5zdGFibGU7IHVyZ2VuY3k9bWVkaXVtCiAKICAgWyBIZWxtdXQgR3JvaG5lIF0KZGlm ZiAtTnJ1IHJheS0yLjMuMS9kZWJpYW4vcnVsZXMgcmF5LTIuMy4xL2RlYmlhbi9ydWxlcwotLS0g cmF5LTIuMy4xL2RlYmlhbi9ydWxlcwkyMDI0LTEyLTAyIDE2OjM3OjUxLjAwMDAwMDAwMCArMDEw MAorKysgcmF5LTIuMy4xL2RlYmlhbi9ydWxlcwkyMDI2LTEwLTEzIDExOjE5OjA3LjAwMDAwMDAw MCArMDIwMApAQCAtNyw4ICs3LDEwIEBACiAjZXhwb3J0IERIX1ZFUkJPU0U9MQogCiBleHBvcnQg REVCX0JVSUxEX01BSU5UX09QVElPTlMgPSBoYXJkZW5pbmc9K2FsbAotZXhwb3J0IERFQl9DWFhG TEFHU19NQUlOVF9BUFBFTkQgPSAkKHNoZWxsICQoUEtHX0NPTkZJRykgLS1jZmxhZ3MgbXBpLWMp Ci1leHBvcnQgREVCX0xERkxBR1NfTUFJTlRfQVBQRU5EID0gJChzaGVsbCAkKFBLR19DT05GSUcp IC0tbGlicyBtcGktYykKK2V4cG9ydCBERUJfQ1hYRkxBR1NfTUFJTlRfQVBQRU5EID0gJChzaGVs bCAkKFBLR19DT05GSUcpIC0tY2ZsYWdzIG1waSkKKyMgTGluayB0aHJvdWdoIHRoZSBsaWJtcGku c28gYWx0ZXJuYXRpdmUgcmF0aGVyIHRoYW4gInBrZy1jb25maWcgLS1saWJzIjoKKyMgTVBJQ0gn cyAucGMgbGVha3MgaXRzIG93biBidWlsZCBMREZMQUdTLgorZXhwb3J0IERFQl9MREZMQUdTX01B SU5UX0FQUEVORCA9IC1sbXBpCiAKICU6CiAJZGggJEAK --0000000000007d610e065db8e41a-- ]