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Subject: bug#74010: openmpi@5 requires propagated libraries
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Hello,

when updating openmpi from @4 to @5, my code does not link any more with the
messages:
ld: cannot find -lrdmacm: No such file or directory
ld: cannot find -lefa: No such file or directory
ld: cannot find -libverbs: No such file or directory
ld: cannot find -lpsm2: No such file or directory

Installing rdma-core and psm2 solves the problem.

Here is a way to reproduce the problem:
cd /tmp
tar xvf `guix build -S cm`
cd cm-0.4.3
guix shell --pure openmpi -D cm -- /bin/sh --norc
./configure --enable-mpi
make -j

Hm, I think the culprit is actually libfabric. It has these two packages as
inputs, and contains this in its libfabric.pc:
Libs.private:  -lpsm2 -lrdmacm -libverbs -lefa -latomic -lpthread -ldl

I am not familiar with pkgconfig and do not know what distinguishes the Libs
from the Libs.private field. But the line for linking my binary contains this
in exactly this order:
/gnu/store/0f6bjfrf9kkdqh27y0bab9x9b4i8w5gi-libfabric-1.22.0/lib/libfabric.so -lrdmacm -lefa -libverbs -lpsm2

So this at least confirms the idea that something needs to be done for
libfabric. Propagate its inputs? ldd on libfabric.so shows the required
libraries
   librdmacm.so.1 => /gnu/store/2d...
and so on, so I do not understand what goes wrong.

Andreas

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To: Andreas Enge <andreas@HIDDEN>
Subject: bug#74010: Acknowledgement (openmpi@5 requires propagated libraries)
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Subject: bug#74010: openmpi@5 requires propagated libraries
Resent-From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludovic.courtes@HIDDEN>
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Date: Fri, 25 Oct 2024 12:31:29 +0200
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Hello,

Andreas Enge <andreas@HIDDEN> skribis:

> when updating openmpi from @4 to @5, my code does not link any more with =
the
> messages:
> ld: cannot find -lrdmacm: No such file or directory
> ld: cannot find -lefa: No such file or directory
> ld: cannot find -libverbs: No such file or directory
> ld: cannot find -lpsm2: No such file or directory
>
> Installing rdma-core and psm2 solves the problem.
>
> Here is a way to reproduce the problem:
> cd /tmp
> tar xvf `guix build -S cm`

Note that =E2=80=98cm=E2=80=99 as currently packaged does not depend on ope=
nmpi.

> Hm, I think the culprit is actually libfabric. It has these two packages =
as
> inputs, and contains this in its libfabric.pc:
> Libs.private:  -lpsm2 -lrdmacm -libverbs -lefa -latomic -lpthread -ldl
>
> I am not familiar with pkgconfig and do not know what distinguishes the L=
ibs
> from the Libs.private field. But the line for linking my binary contains =
this
> in exactly this order:

It looks like the culprit is not pkg-config but Libtool:

--8<---------------cut here---------------start------------->8---
$ cat $(guix build openmpi@5 |grep -v debug)/lib/libmpi.la |grep ^dependenc=
y_libs
dependency_libs=3D' -L/gnu/store/lqgg509yb3f85ck4k6l0qp7a70bz7daa-libevent-=
2.1.12/lib -L/gnu/store/j9nkxb0kcx8i6fmjjlg9m5icapdnsvs8-hwloc-2.11.1-lib/l=
ib -L/gnu/store/mqmlzbzarz2s56khlkl7xk20xlsxdf04-openpmix-4.2.8/lib -L/gnu/=
store/an3mrydqv3x9kzkv45jcay0jh301v06q-libpciaccess-0.16/lib -L/gnu/store/1=
prv14v6jfnzzg7szm57690b7fr6sx33-zlib-1.3/lib -L/gnu/store/0f6bjfrf9kkdqh27y=
0bab9x9b4i8w5gi-libfabric-1.22.0/lib -L/gnu/store/0qqy5010by77h33ny3gzmaqx9=
0c93q5v-ucx-1.15.0/lib /gnu/store/1g7npkghs0b25gyk42pgcns8icy29gk3-openmpi-=
5.0.3/lib/libopen-pal.la /gnu/store/0f6bjfrf9kkdqh27y0bab9x9b4i8w5gi-libfab=
ric-1.22.0/lib/libfabric.la -lrdmacm -lefa -libverbs -lpsm2 /gnu/store/zzpb=
p6rr43smwxzvzd4qd317z5j7qblj-gcc-11.4.0-lib/lib/libatomic.la -lpthread /gnu=
/store/0qqy5010by77h33ny3gzmaqx90c93q5v-ucx-1.15.0/lib/libucp.la /gnu/store=
/0qqy5010by77h33ny3gzmaqx90c93q5v-ucx-1.15.0/lib/libuct.la /gnu/store/0qqy5=
010by77h33ny3gzmaqx90c93q5v-ucx-1.15.0/lib/libucs.la /gnu/store/0qqy5010by7=
7h33ny3gzmaqx90c93q5v-ucx-1.15.0/lib/libucm.la -lrt /gnu/store/mqmlzbzarz2s=
56khlkl7xk20xlsxdf04-openpmix-4.2.8/lib/libpmix.la -ldl /gnu/store/lqgg509y=
b3f85ck4k6l0qp7a70bz7daa-libevent-2.1.12/lib/libevent_core.la /gnu/store/lq=
gg509yb3f85ck4k6l0qp7a70bz7daa-libevent-2.1.12/lib/libevent_pthreads.la /gn=
u/store/j9nkxb0kcx8i6fmjjlg9m5icapdnsvs8-hwloc-2.11.1-lib/lib/libhwloc.la -=
lm /gnu/store/an3mrydqv3x9kzkv45jcay0jh301v06q-libpciaccess-0.16/lib/libpci=
access.la -lz'
$ cat $(guix build openmpi@4 |grep -v debug)/lib/libmpi.la |grep ^dependenc=
y_libs
dependency_libs=3D' -L/gnu/store/an3mrydqv3x9kzkv45jcay0jh301v06q-libpciacc=
ess-0.16/lib -L/gnu/store/1prv14v6jfnzzg7szm57690b7fr6sx33-zlib-1.3/lib /gn=
u/store/gaip8ig4yv0hx5s60hbka6h8lkh6747y-openmpi-4.1.6/lib/libopen-rte.la /=
gnu/store/gaip8ig4yv0hx5s60hbka6h8lkh6747y-openmpi-4.1.6/lib/libopen-pal.la=
 /gnu/store/j9nkxb0kcx8i6fmjjlg9m5icapdnsvs8-hwloc-2.11.1-lib/lib/libhwloc.=
la -lm /gnu/store/an3mrydqv3x9kzkv45jcay0jh301v06q-libpciaccess-0.16/lib/li=
bpciaccess.la -lz /gnu/store/lqgg509yb3f85ck4k6l0qp7a70bz7daa-libevent-2.1.=
12/lib/libevent_core.la /gnu/store/lqgg509yb3f85ck4k6l0qp7a70bz7daa-libeven=
t-2.1.12/lib/libevent_pthreads.la'
--8<---------------cut here---------------end--------------->8---

We need to check the build process of openmpi to see where all these
extra =E2=80=98-l=E2=80=99 in libmpi.la come from.

Thanks,
Ludo=E2=80=99.

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Subject: bug#74010: openmpi@5 requires propagated libraries
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Date: Fri, 25 Oct 2024 12:46:36 +0200
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Am Fri, Oct 25, 2024 at 12:31:29PM +0200 schrieb Ludovic Courtès:
> Note that ‘cm’ as currently packaged does not depend on openmpi.

No, because I did not add the "--enable-mpi" configuration option.
This is just an example; I think the problem would occur with any
software using openmpi@5.

Andreas

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Am Fri, Oct 25, 2024 at 12:31:29PM +0200 schrieb Ludovic Court�s:
> It looks like the culprit is not pkg-config but Libtool:
> --8<---------------cut here---------------start------------->8---
> $ cat $(guix build openmpi@5 |grep -v debug)/lib/libmpi.la |grep ^dependency_libs
> dependency_libs='
> ...
> /gnu/store/0f6bjfrf9kkdqh27y0bab9x9b4i8w5gi-libfabric-1.22.0/lib/libfabric.la -lrdmacm -lefa -libverbs -lpsm2 /gnu/store/zzpbp6rr43smwxzvzd4qd317z5j7qblj-gcc-11.4.0-lib/lib/libatomic.la -lpthread

This part comes from libfabric, which has this line in 
/gnu/store/0f6bjfrf9kkdqh27y0bab9x9b4i8w5gi-libfabric-1.22.0/lib/libfabric.la :
dependency_libs=' -lrdmacm -lefa -libverbs -lpsm2 /gnu/store/zzpbp6rr43smwxzvzd4qd317z5j7qblj-gcc-11.4.0-lib/lib/libatomic.la -lpthread -ldl'

But both openmpi@4 and @5 depend on libfabric, so this does not explain
the difference.

Then I do not understand why one of the libraries has an absolute path,
and the others just their name. Maybe something should be changed in
the building of libfabric?

But indeed my code using openmpi@4 does not link with libfabric, as you
noticed, and it works nevertheless.

Andreas

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Andreas Enge <andreas@HIDDEN> skribis:

> Am Fri, Oct 25, 2024 at 12:31:29PM +0200 schrieb Ludovic Court=C3=A8s:
>> Note that =E2=80=98cm=E2=80=99 as currently packaged does not depend on =
openmpi.
>
> No, because I did not add the "--enable-mpi" configuration option.
> This is just an example; I think the problem would occur with any
> software using openmpi@5.

Only for software using Libtool.  For example, this works:

  guix build intel-mpi-benchmarks --with-input=3Dopenmpi@4=3Dopenmpi@5

This particular package uses CMake, which is more common than Autotools
in this domain.

Maybe someday we=E2=80=99ll just remove .la files wholesale, as Debian and
others have been doing for a while.

Ludo=E2=80=99.

Last modified: Sun, 12 Jan 2025 05:45:02 UTC

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