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Re: AC_PROG_FC may not be first compiler check

From: Paul Eggert
Subject: Re: AC_PROG_FC may not be first compiler check
Date: Sun, 03 Sep 2006 12:55:09 -0700
User-agent: Gnus/5.1008 (Gnus v5.10.8) Emacs/21.4 (gnu/linux)

Ralf Wildenhues <address@hidden> writes:

> I think we should just document that it's the way things are.

OK, thanks, that makes sense, though it very much sounds like a bug to
me.  I installed the following somewhat-more-strongly-worded patch.

2006-09-03  Paul Eggert  <address@hidden>
        and Ralf Wildenhues  <address@hidden>

        * doc/autoconf.texi (Fortran Compiler): Document that AC_PROG_CC
        should be called before AC_PROG_FC, due to a bug in Autoconf.

--- doc/autoconf.texi   3 Sep 2006 19:41:12 -0000       1.1077
+++ doc/autoconf.texi   3 Sep 2006 19:53:07 -0000       1.1078
@@ -6852,6 +6852,9 @@ If the output variable @code{FCFLAGS} wa
 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

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