The attached patch adds a white-space separated list of Fortran compilers
whose existence should be ignored to AC_PROG_{FC,F77}.
(There may be better ways of implementing this!)
The problem I encountered was that the first available compiler on
the checklist was unable to compile a particular program. The
current options to work around this are:
- look for another compiler on the system and set FC
- add a list of compilers to try without the problematic one as the first
argument to AC_PROG_FC
I was looking for an option of the form "I don't know what other compilers
are on this system, I just know that foo95 doesn't work in this case".
If this is deemed to be a good idea, would a --with{,out}-fortran-compilers
option by desirable to manipulate arguments 1 and 3 to AC_PROG_FC more
easily for a configure user?
Cheers,
Patrick
>From 27196e1aa3a661447d2404fa0266e2b524d8153f Mon Sep 17 00:00:00 2001
From: Patrick Welche <[email protected]>
Date: Mon, 17 Jun 2013 09:55:47 +0100
Subject: [PATCH] fortran.m4: add list of Fortran compilers to ignore as
argument to AC_PROG_{FC,F77}
---
doc/autoconf.texi | 13 +++++++++++--
lib/autoconf/fortran.m4 | 15 ++++++++++-----
2 files changed, 21 insertions(+), 7 deletions(-)
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index faf6d97..95beb10 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -7870,7 +7870,7 @@ Except for the macros @code{AC_FC_SRCEXT},
@code{AC_FC_FREEFORM},
are documented together in this section.
-@defmac AC_PROG_F77 (@ovar{compiler-search-list})
+@defmac AC_PROG_F77 (@ovar{compiler-search-list},
@ovar{rejected-compiler-list})
@acindex{PROG_F77}
@evindex F77
@evindex FFLAGS
@@ -7883,6 +7883,10 @@ set in the environment, then check for @code{g77} and
@code{f77}, and
then some other names. Set the output variable @code{F77} to the name
of the compiler found.
+The optional second argument to the macro is a blank-separated list of
+Fortran 77 compilers whose presence should be ignored and are omitted
+from the search.
+
This macro may, however, be invoked with an optional first argument
which, if specified, must be a blank-separated list of Fortran 77
compilers to search for. This just gives the user an opportunity to
@@ -7906,7 +7910,8 @@ The result of the GNU test is cached in the
@code{ac_cv_prog_f77_g} variable.
@end defmac
-@defmac AC_PROG_FC (@ovar{compiler-search-list}, @ovar{dialect})
+@defmac AC_PROG_FC (@ovar{compiler-search-list}, @ovar{dialect}, @
+ @ovar{rejected-compiler-list})
@acindex{PROG_FC}
@evindex FC
@evindex FCFLAGS
@@ -7930,6 +7935,10 @@ is actually supported. Thus, it is preferable that you
avoid the
@code{dialect} option, and use AC_PROG_FC only for code compatible with
the latest Fortran standard.
+The optional third argument to the macro is a blank-separated list of
+Fortran compilers whose presence should be ignored and are omitted
+from the search.
+
This macro may, alternatively, be invoked with an optional first argument
which, if specified, must be a blank-separated list of Fortran
compilers to search for, just as in @code{AC_PROG_F77}.
diff --git a/lib/autoconf/fortran.m4 b/lib/autoconf/fortran.m4
index f20b029..2354e0a 100644
--- a/lib/autoconf/fortran.m4
+++ b/lib/autoconf/fortran.m4
@@ -285,7 +285,7 @@ AC_DEFUN([_AC_FC_DIALECT_YEAR],
[m4_fatal([unknown Fortran dialect])])])
-# _AC_PROG_FC([DIALECT], [COMPILERS...])
+# _AC_PROG_FC([DIALECT], [COMPILERS...], [REJECTED_COMPILERS...])
# --------------------------------------
# DIALECT is a Fortran dialect, given by Fortran [YY]YY or simply [YY]YY,
# and must be one of those supported by _AC_FC_DIALECT_YEAR
@@ -322,6 +322,11 @@ m4_define([_AC_F90_FC], [xlf90 f90 pgf90 pghpf epcf90])
m4_define([_AC_F77_FC], [g77 xlf f77 frt pgf77 cf77 fort77 fl32 af77])
AC_DEFUN([_AC_PROG_FC],
[_AC_FORTRAN_ASSERT()dnl
+m4_foreach_w([_AC_FC_rejcomp], [$3], [
+m4_define([_AC_F95_FC],m4_bpatsubst(m4_defn([_AC_F95_FC]),\<_AC_FC_rejcomp\>))
+m4_define([_AC_F90_FC],m4_bpatsubst(m4_defn([_AC_F90_FC]),\<_AC_FC_rejcomp\>))
+m4_define([_AC_F77_FC],m4_bpatsubst(m4_defn([_AC_F77_FC]),\<_AC_FC_rejcomp\>))
+])
AC_CHECK_TOOLS([]_AC_FC[],
m4_default([$2],
m4_case(_AC_FC_DIALECT_YEAR([$1]),
@@ -351,7 +356,7 @@ _AC_PROG_FC_G
])# _AC_PROG_FC
-# AC_PROG_F77([COMPILERS...])
+# AC_PROG_F77([COMPILERS...], [REJECTED_COMPILERS...])
# ---------------------------
# COMPILERS is a space separated list of Fortran 77 compilers to search
# for. See also _AC_PROG_FC.
@@ -361,7 +366,7 @@ AC_ARG_VAR([F77], [Fortran 77 compiler command])dnl
AC_ARG_VAR([FFLAGS], [Fortran 77 compiler flags])dnl
_AC_ARG_VAR_LDFLAGS()dnl
_AC_ARG_VAR_LIBS()dnl
-_AC_PROG_FC([Fortran 77], [$1])
+_AC_PROG_FC([Fortran 77], [$1], [$2])
if test $ac_compiler_gnu = yes; then
G77=yes
else
@@ -371,7 +376,7 @@ AC_LANG_POP(Fortran 77)dnl
])# AC_PROG_F77
-# AC_PROG_FC([COMPILERS...], [DIALECT])
+# AC_PROG_FC([COMPILERS...], [DIALECT], [REJECTED_COMPILERS...])
# -------------------------------------
# COMPILERS is a space separated list of Fortran 77 compilers to search
# for, and [DIALECT] is an optional dialect. See also _AC_PROG_FC.
@@ -381,7 +386,7 @@ AC_ARG_VAR([FC], [Fortran compiler command])dnl
AC_ARG_VAR([FCFLAGS], [Fortran compiler flags])dnl
_AC_ARG_VAR_LDFLAGS()dnl
_AC_ARG_VAR_LIBS()dnl
-_AC_PROG_FC([$2], [$1])
+_AC_PROG_FC([$2], [$1], [$3])
if test $ac_compiler_gnu = yes; then
GFC=yes
else
--
1.8.2.3
