Re: Finding BLAS and LAPACK

[Ben Abbott]

On Feb 23, 2010, at 8:49 PM, Mag Gam wrote:
> 
> On Tue, Feb 23, 2010 at 5:37 PM, John W. Eaton <address@hidden> wrote:
>> On 23-Feb-2010, Mag Gam wrote:
>> 
>> | Unfortunately, this does not pick up BLAS
>> |
>> | I am using ./configure --prefix=/apps LDFLAGS="-L/apps/libs"
>> |
>> | Any other suggestion?
>> |
>> |
>> | configure:11325: checking for sgemm_ in -lblas
>> | configure:11358: gcc -o conftest -g -O2 -I/apps/hdf5-1.8.3/include
>> | -L/apps/hdf5-1.8.3/lib conftest.c -lblas  -lhdf5 -lz -lm
>> | -L/apps/hdf5-1.8.3/lib -L/usr/lib/gcc/x86_64-redhat-linux/3.4.6
>> | -L/usr/lib/gcc/x86_64-redhat-linux/3.4.6/../../../../lib64
>> | -L/usr/lib/gcc/x86_64-redhat-linux/3.4.6/../../.. -L/lib/../lib64
>> | -L/usr/lib/../lib64 -lhdf5 -lz -lfrtbegin -lg2c -lm >&5
>> | /usr/bin/ld: cannot find -lblas
>> | collect2: ld returned 1 exit status
>> | configure:11358: $? = 1
>> |
>> | I see this in my config.log
>> 
>> You'll need to give us more details, like which BLAS you are using and
>> how you compiled it.
>> 
>> What do you see if you run
>> 
>>  nm /apps/libs/your-blas-lib | grep -i sgemm
>> 
>> ?
>> 
>> jwe
>> cg
>> 
> 
> These are some libraries of interest
> /apps/libslibgslcblas.so
> /apps/libslibgslcblas.a
> /apps/libslibcblas.a
> /apps/libslibf77blas.a
> /apps/libslibblas.a
> /apps/libslibgslcblas.so.0.0.0
> /apps/libslibcblas.so
> 
> # nm /apps/libslibblas.a | grep -i sgemm
> sgemm.o:
> 0000000000000000 T sgemm_

Those names don't look standard to me. I think you can use them if you append 
the following to your configure command.

./configure --prefix=/apps LDFLAGS="-L/apps/libs" LIBS="-lslibgslcblas 
-lslibcblas -lslibf77blas -lslibblas"

Ben

p.s. please reply at the bottom so that those arriving late can follow along.