diff options
Diffstat (limited to 'm4')
| -rw-r--r-- | m4/compiler-flags.m4 | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/m4/compiler-flags.m4 b/m4/compiler-flags.m4 new file mode 100644 index 0000000..4940a1e --- /dev/null +++ b/m4/compiler-flags.m4 @@ -0,0 +1,40 @@ +# 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* + ]) |