[petsc-users] 3.16.4 amd blis libflame linking problem

[Satish Balay]

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.

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/>
> 
>