commit ac89710a97cd83a809163cc4f439b58c707cf0d3
Author: Jeroen Demeyer <address@hidden>
Date:   Fri Jun 15 11:40:23 2012 +0200

    _AC_PROG_FC_V: use -### instead of -v to detect linker options

diff --git a/lib/autoconf/fortran.m4 b/lib/autoconf/fortran.m4
index 3803595..bd3c58e 100644
--- a/lib/autoconf/fortran.m4
+++ b/lib/autoconf/fortran.m4
@@ -574,10 +574,16 @@ esac
 # _AC_PROG_FC_V
 # -------------
 #
-# Determine the flag that causes the Fortran compiler to print
-# information of library and object files (normally -v)
+# Determine the flag that causes the Fortran compiler to print what
+# it is doing: which library / object files are linked in.
 # Needed for _AC_FC_LIBRARY_FLAGS
-# Some compilers don't accept -v (Lahey: (-)-verbose, xlf: -V, Fujitsu: -###)
+#
+# gfortran prefers -### for this. With -###, the compiler/linker is not
+# actually run, it is printed to stderr what would happen.  This is
+# better than -v because running the compiler/linker might print
+# warnings which confuse this script.
+#
+# Many other compilers use -v; Lahey uses (-)-verbose; xlf uses -V
 AC_DEFUN([_AC_PROG_FC_V],
 [_AC_FORTRAN_ASSERT()dnl
 AC_CACHE_CHECK([how to get verbose linking output from $[]_AC_FC[]],
@@ -585,7 +591,7 @@ AC_CACHE_CHECK([how to get verbose linking output from $[]_AC_FC[]],
 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
 [ac_cv_prog_[]_AC_LANG_ABBREV[]_v=
 # Try some options frequently used verbose output
-for ac_verb in -v -verbose --verbose -V -\#\#\#; do
+for ac_verb in -\#\#\# -v -verbose --verbose -V; do
   _AC_PROG_FC_V_OUTPUT($ac_verb)
   # look for -l* and *.a constructs in the output
   for ac_arg in $ac_[]_AC_LANG_ABBREV[]_v_output; do