linking with shared object. Can we use -L?

centguy · 08-31-2020, 12:35 AM

This is working:

Quote:

gfortran -fPIC -ffree-line-length-0 -o fm-forces types_and_constants.o sgsym.o commod.o fm-forces.f90 /usr/lib64/liblapack.so.3 /usr/lib64/libblas.so.3

But then

this is not working:

Quote:

gfortran -fPIC -ffree-line-length-0 -o fm-forces types_and_constants.o sgsym.o commod.o fm-forces.f90 -L/usr/lib64 -llapack -lblas
/usr/bin/ld: cannot find -llapack
/usr/bin/ld: cannot find -lblas
collect2: error: ld returned 1 exit status
make: *** [Makefile:33: fm-forces] Error 1

So I am forced to use the full path to each of the .so.x object?

If it is .a, then -L"path-to-lapack-blas" -llapack -lblas
will just work.

Such an embarassing question...

pan64 · 08-31-2020, 01:13 AM

most probably you need to use *.so files with -l, *.so.3 (or similar) will not be found. The usual solution is to create a symbolic link. Also -L/usr/lib64 is usually not required.