[petsc-users] 3.16.4 amd blis libflame linking problem

[Satish Balay]

On Fri, 4 Feb 2022, Barry Smith wrote:

> 
> 
> > On Feb 4, 2022, at 12:27 PM, Satish Balay <balay at mcs.anl.gov> wrote:
> > 
> > Probably best if you can use the same version of gfortran to build both petsc and libflame/blis
> > 
> >> /usr/bin/ld: warning: libgfortran.so.5, needed by /opt/amd/amd-libflame-3.1.0/lib/lp64/libflame.so, not found (try using -rpath or -rpath-link):
> > 
> > This is probably an ignore-able warning - but configure defaults to -Werror mode here.
> 
>   Hmm, if it needs libgfortran.so.5 then it needs it and it cannot be ignored since a link cannot succeed. Flame presumably contains a lot of old Fortran code from Lapack so would normally need the fortran libraries.

Its a warning not an error.

And we already have a list of excludes (of such warnings) to ignore in configure

Satish

> 
> > 
> > Wrt forcing link with static libraries - you can try:
> > 
> > LIBS="/opt/amd/amd-libflame-3.1.0/lib/lp64/libflame.a /opt/amd/amd-blis-3.1.0/lib/lp64/libblis.a"
> > 
> > [instead of --with-blas-lib= --with-lapack-lib= options].
> > 
> > Satish
> > 
> > 
> > On Fri, 4 Feb 2022, Barry Smith wrote:
> > 
> >> 
> >> Please do 
> >> 
> >>  ldd -O /opt/amd/amd-libflame-3.1.0/lib/lp64/libflame.so
> >> 
> >> You may need to list the gfortran library directory of libgfortran.so.5 it needs to use in LDFLAGS passed to PETSc configure 
> >> 
> >> Barry
> >> 
> >> Note: Even though you explicitly listed a static library of libflame to use our configure is goofy and loses that information and wants to link with the shared version
> >> 
> >> 
> >>> On Feb 4, 2022, at 12:00 PM, Anton Popov <popov at uni-mainz.de> wrote:
> >>> 
> >>> 
> >>> 
> >>> On 04.02.22 17:39, Matthew Knepley wrote:
> >>>> On Fri, Feb 4, 2022 at 11:35 AM Anton Popov <popov at uni-mainz.de <mailto:popov at uni-mainz.de>> wrote:
> >>>> Hi Satish,
> >>>> 
> >>>> I just discovered that PETSc 3.16.4 fails to link against the latest AMD 
> >>>> BLIS and LibFLAME libraries on a Linux box.
> >>>> 
> >>>> -------------------------------------------------------------------------------
> >>>> You set a value for --with-blas-lib=<lib> and --with-lapack-lib=<lib>, 
> >>>> but ['/opt/amd/amd-blis-3.1.0/lib/lp64/libblis.a'] and 
> >>>> ['/opt/amd/amd-libflame-3.1.0/lib/lp64/libflame.a'] cannot be used
> >>>> *******************************************************************************
> >>>> 
> >>>> My previous experience with 3.9.4 on the same system was fully 
> >>>> successful. Looking in the configure logs (attached) reveals small 
> >>>> difference in the linking compared to 3.9.4
> >>>> 
> >>>> Could you please make a guess what went wrong?
> >>>> 
> >>>> Down in the log I see:
> >>>> 
> >>>> /usr/bin/ld: warning: libgfortran.so.5, needed by /opt/amd/amd-libflame-3.1.0/lib/lp64/libflame.so, not found (try using -rpath or -rpath-link):
> >>> Thanks Matt, I'll try.
> >>> 
> >>>> 
> >>>> Did the gfortran library move or get upgraded?
> >>> Not at all. I have configured 3.9.4 just now to make a test, and it perfectly finds all the libraries. So there must be something that 3.16.4 does differently. 
> >>> 
> >>> Best,
> >>> 
> >>> Anton
> >>> 
> >>>> 
> >>>>  Thanks,
> >>>> 
> >>>>     Matt
> >>>> 
> >>>> Best regards,
> >>>> 
> >>>> Anton
> >>>> 
> >>>> 
> >>>> -- 
> >>>> What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.
> >>>> -- Norbert Wiener
> >>>> 
> >>>> https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
> >> 
> >> 
> > 
>