Building math-vector-fortran.h in glibc

[Steve Ellcey]

Martin,

I have been working with libmvec on aarch64 and I took your glibc script
to create math-vector-fortran.h and incorporated it into the glibc
math Makefile to try it out.  The patch is attached to this email.

The main thing I noticed is that your script was specifically grepping
for __DECL_SIMD_x86_64 and when I created a math-vector.h file for
Aarch64 I used __DECL_SIMD_AARCH64 so I had to change the script.

I don't think we want a different script for each target so we need to
find some way to deal with this.  Either use a common name on all
platforms, which I think is OK since this should be an internal
macro name that is not used by end users or find a way to generalize
the match regardless of the name.

The other thought I had was, instead of scanning math-vector.h,
have the script preprocess math.h itself and then look for simd
attributes after preprocessing.  I think that would make the scanner
more complex though.

Steve Ellcey
sellcey@marvell.com
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