Paul,
in my environment, libslurm.la contains
# Linker flags that can not go in dependency_libs.
inherited_linker_flags=' -pthread'
# Libraries that this one depends upon.
dependency_libs=' -ldl -lpthread'
so bottom line, it invokes the compiler with both -pthread and -lpthread
iirc, -pthread does two things :
- invoke the compiler with -D_REENTRANT (so it uses the thread-safe
errno and so on)
- invoke the linker with -lpthread
OpenMPI has its own way to pass -D_REENTRANT or similar anyway, and
libslurm.la is used only for for linking.
since -lpthread is pulled anyway from libslurm.la (or it was already set
by OpenMPI), then yes, discarding -pthread should do the trick.
Cheers,
Gilles
On 7/26/2016 10:11 AM, Paul Hargrove wrote:
Gilles,
My initial thought is that libslurm probably does require linking
libpthread, either for for linking pthread_* symbols, or for proper
*operation* (such as thread-safe versions of functions which override
weak definitions in libc).
If so, then neither omitting "-pthread" nor telling pgcc not to
complain about "-pthread" is going to be a good solution.
Instead the "-pthread" needs to be replaced by "-lpthread", or similar.
-Paul
On Mon, Jul 25, 2016 at 6:03 PM, Gilles Gouaillardet
<gil...@rist.or.jp <mailto:gil...@rist.or.jp>> wrote:
Folks,
This is a followup of a thread that initially started at
http://www.open-mpi.org/community/lists/users/2016/07/29635.php
The user is trying to build Open MPI with PGI compiler and
libslurm.la/libpmi.la <http://libslurm.la/libpmi.la> support, and
slurm was built with gcc compiler.
At first, it fails because the "-pthread" flag is pulled from
libslurm.la/libpmi.la <http://libslurm.la/libpmi.la>, but this
flag is not supported by PGI compilers.
A workaround is to pass the -noswitcherror flag to the PGI
compiler (so the -pthread flag is discarded and a warning message
is issued, but PGI compiler does not fail). Unfortunatly, that
does not work because libtool does does not pass this flag to the
PGI compiler.
Of course, one option is to tell the user to rebuild slurm with
PGI, so libslurm.la/libpmi.la <http://libslurm.la/libpmi.la> do
not have the "-pthread" flag.
A nicer though arguable option is to hack libtool to silently drop
the "-pthread" flag with PGI compiler is used (i made a proof of
concept, and this is a two lines patch).
An other cleaner option is to hack libtool so it pass
-noswitcherror to PGI compiler, but i do not know how to achieve this.
Any thoughts ?
Cheers
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Paul H. Hargrove phhargr...@lbl.gov <mailto:phhargr...@lbl.gov>
Computer Languages & Systems Software (CLaSS) Group
Computer Science Department Tel: +1-510-495-2352
Lawrence Berkeley National Laboratory Fax: +1-510-486-6900
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