detect if fortran compiler is available

[Peter Johansson]

Hello,

I wonder if there is an easy way to test if there is a Fortran compiler 
available.

We are using GSL, which needs to be linked with a cblas library. To test 
which cblas library to use, we employ the ACX_BLAS macro 
(http://autoconf-archive.cryp.to/acx_blas.html) and if nothing is found 
we fall back on libgslcblas provided with GSL. The problem is that 
ACX_BLAS exits with error when there is no fortran compiler available 
due to a call to AC_F77_LIBRARY_LDFLAGS. Therefore, we'd like to test if 
fortran is available and if not avoid calling fortran related things. If 
possible, we'd prefer to avoid adding fortran as an requirement for our 
package and instead when fortran is not available for example fall back 
on libgslcblas which is completely independent of fortran code. Is there 
a macro available within Autoconf or Autoconf Archive that I'm missing?

Thanks,
Peter

--
Peter Johansson

svndigest maintainer, http://dev.thep.lu.se/svndigest
yat maintainer,       http://dev.thep.lu.se/yat