[petsc-users] 3.16.4 amd blis libflame linking problem

[Barry Smith]

> 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.

> 
> 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/>
>> 
>> 
>