LAPACK for Fortran under Cygwin

[Bill Foster]

I just installed LAPACK, but I'm not sure how to use it. The documentation tells about the routines, but the problem is my compiler isn't recognizing them.

For example...I wrote a simple Fortran program to test a routine (SGESV):

      program testlapack
          implicit  none

          integer N
          parameter(N=10)
          integer NRHS
          parameter(NRHS=1)
          integer LDA
          parameter(LDA=10)
          integer IPIV(N)
          integer LDB
          parameter(LDB=N)
          real A(LDA,N)
          real B(LDB,NRHS)
          integer INFO
          external SGESV

          call SGESV(N,NRHS,A,LDA,IPIV,B,LDB,INFO)

       end

Then I compile in and it fails...

$ g77 -ff90 -o test test.for 
/cygdrive/c/Users/david/AppData/Local/Temp/ccU0lt1W.o:test.for:(.text+0x4e): undefined reference to `_sgesv_'
collect2: ld returned 1 exit status

Is there something line an "include" or "use" statement that I have to include in my code file so the compiler will recognize these LAPACK routines?

Thanks.

 

[Bill Foster]

I seem to have found a solution by specifying a linker flag:

$ g77 -ff90 -o test test.for -llapack

 

[alxm]

Yup, that's how you link to a library.