Re: F77 vs. F90 in Octave

[Daniel J Sebald]

On 11/24/2014 11:02 AM, Rik wrote:
> A quick check for F90 features shows that>  95% is written in F77.  The
> exceptions are some files in blas-xtra and lapack-xtra written by Jaroslav
> that seem to be in a mostly F77 syntax, but with a few F95 features.

Is the F95 code using a different compiler then?  Or maybe same compiler 
but a compatibility flag?  How is it compiling if FC=$F77?

I guess I'd prefer to stick to the autotools method as much as possible. 
 In README.MacOS it describes

The commands below are sufficient to build a 32-bit Octave.

  export FC="/usr/bin/gfortran"
...

However, if the make file does FC=$F77, isn't that overriding the 
ability to specify the compiler via the environment variable FC?  I see 
that as important because what if someone is compiling the code for a 
CPU target other than the system the compilation is done on?  I suppose 
someone could also add

  export F77="xyz"

Still, I'd stay as close as possible to autoconf, and if it is necessary 
to deviate, write a comment along with the deviation.

Dan