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Re: AC_PROG_FC may not be first compiler check

From: Ralf Wildenhues
Subject: Re: AC_PROG_FC may not be first compiler check
Date: Tue, 5 Sep 2006 19:18:56 +0200
User-agent: Mutt/1.5.13 (2006-08-11)


* Steven G. Johnson wrote on Mon, Sep 04, 2006 at 10:30:20PM CEST:
> On Mon, 4 Sep 2006, Ralf Wildenhues wrote:
> >Maybe AC_PROG_FC should by default check for xlf9x before checking f9x?

> That sounds fine to me.  On any system with xlf*, the xlf* compilers are 
> probably preferable to f*.

OK, thanks.  I installed the patch below.  A good reason for changing
the Fortran 77 compiler order as well is that we should try not to
choose a different-vendor F77 than FC on systems where this may matter
(XL compilers are available for other systems, e.g., GNU/Linux ppc).

>>(Note that I'm not fully aware of other ordering conditions the current
>>list in _AC_PROG_FC may have).

FWIW, I found only "cf77 before fort77" for ancient Crays (forgot I
added that...)

Cheers, and thanks for your help,

        * lib/autoconf/fortran.m4 (_AC_PROG_FC): Prefer xlf90/xlf95 over
        f90/f95 because the latter drivers of AIX Fortran 9.1 do not
        accept files with extension `.f'.  For consistency, also prefer
        xlf over f77.
        * doc/autoconf.texi (Fortran Compiler): Remove mention of bug
        from last patch.

Index: doc/autoconf.texi
RCS file: /cvsroot/autoconf/autoconf/doc/autoconf.texi,v
retrieving revision 1.1079
diff -u -r1.1079 autoconf.texi
--- doc/autoconf.texi   5 Sep 2006 14:36:18 -0000       1.1079
+++ doc/autoconf.texi   5 Sep 2006 17:11:57 -0000
@@ -6852,9 +6852,6 @@
 environment, then set it to @option{-g -02} for @acronym{GNU} @code{g77} (or
 @option{-O2} where @code{g77} does not accept @option{-g}).  Otherwise,
 set @code{FCFLAGS} to @option{-g} for all other Fortran compilers.
-Because of a bug in Autoconf, you should invoke @code{AC_PROG_CC} before
-invoking @code{AC_PROG_FC}.
 @end defmac
 @defmac AC_PROG_F77_C_O
Index: lib/autoconf/fortran.m4
RCS file: /cvsroot/autoconf/autoconf/lib/autoconf/fortran.m4,v
retrieving revision 1.211
diff -u -r1.211 fortran.m4
--- lib/autoconf/fortran.m4     24 Aug 2006 16:46:20 -0000      1.211
+++ lib/autoconf/fortran.m4     5 Sep 2006 17:11:57 -0000
@@ -341,6 +341,8 @@
 #  frt: Fujitsu F77 compiler
 #  pgf77/pgf90/pghpf/pgf95: Portland Group F77/F90/F95 compilers
 #  xlf/xlf90/xlf95: IBM (AIX) F77/F90/F95 compilers
+#    Prefer xlf9x to the generic names because they do not reject file
+#    with extension `.f'.
 #  lf95: Lahey-Fujitsu F95 compiler
 #  fl32: Microsoft Fortran 77 "PowerStation" compiler
 #  af77: Apogee F77 compiler for Intergraph hardware running CLIX
@@ -348,9 +350,9 @@
 #  fort: Compaq (now HP) Fortran 90/95 compiler for Tru64 and Linux/Alpha
 #  ifort, previously ifc: Intel Fortran 95 compiler for Linux/x86
 #  efc: Intel Fortran 95 compiler for IA64
-m4_define([_AC_F95_FC], [gfortran g95 f95 fort xlf95 ifort ifc efc pgf95 lf95 
-m4_define([_AC_F90_FC], [f90 xlf90 pgf90 pghpf epcf90])
-m4_define([_AC_F77_FC], [g77 f77 xlf frt pgf77 cf77 fort77 fl32 af77])
+m4_define([_AC_F95_FC], [gfortran g95 xlf95 f95 fort ifort ifc efc pgf95 lf95 
+m4_define([_AC_F90_FC], [xlf90 f90 pgf90 pghpf epcf90])
+m4_define([_AC_F77_FC], [g77 xlf f77 frt pgf77 cf77 fort77 fl32 af77])

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