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-rw-r--r--m4/compiler-flags.m440
1 files changed, 40 insertions, 0 deletions
diff --git a/m4/compiler-flags.m4 b/m4/compiler-flags.m4
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+# serial 3
+# Find valid warning flags for the C Compiler. -*-Autoconf-*-
+#
+# Copyright (C) 2001, 2002, 2006 Free Software Foundation, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301 USA
+
+# Written by Jesse Thilo.
+
+AC_DEFUN([gl_COMPILER_FLAGS],
+ [AC_MSG_CHECKING(whether compiler accepts $1)
+ AC_SUBST(COMPILER_FLAGS)
+ ac_save_CFLAGS="$CFLAGS"
+ CFLAGS="$CFLAGS $1"
+ AC_TRY_LINK([], [], has_option=yes, has_option=no,)
+ echo 'int x;' >conftest.c
+ $CC $CFLAGS -c conftest.c 2>conftest.err
+ ret=$?
+ if test $ret != 0 -o -s conftest.err -o $has_option = "no"; then
+ AC_MSG_RESULT(no)
+ else
+ AC_MSG_RESULT(yes)
+ COMPILER_FLAGS="$COMPILER_FLAGS $1"
+ fi
+ CFLAGS="$ac_save_CFLAGS"
+ rm -f conftest*
+ ])
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