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49 lines
1.7 KiB
Plaintext
49 lines
1.7 KiB
Plaintext
# serial 3
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# Find valid warning flags for the C Compiler. -*-Autoconf-*-
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#
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# Copyright (C) 2001, 2002, 2006 Free Software Foundation, Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301 USA
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# Written by Jesse Thilo.
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AC_DEFUN([gl_COMPILER_FLAGS],
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[AC_MSG_CHECKING(whether compiler accepts $1)
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AC_SUBST(COMPILER_FLAGS)
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ac_save_CFLAGS="$CFLAGS"
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dnl Some flags are dependant, so we set all previously checked
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dnl flags when testing. Except for -Werror which we have to
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dnl check on its own, because some of our compiler flags cause
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dnl warnings from the autoconf test program!
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if test "$1" = "-Werror" ; then
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CFLAGS="$CFLAGS $1"
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else
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CFLAGS="$CFLAGS $COMPILER_FLAGS $1"
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fi
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AC_TRY_LINK([], [], has_option=yes, has_option=no,)
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echo 'int x;' >conftest.c
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$CC $CFLAGS -c conftest.c 2>conftest.err
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ret=$?
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if test $ret != 0 -o -s conftest.err -o $has_option = "no"; then
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AC_MSG_RESULT(no)
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else
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AC_MSG_RESULT(yes)
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COMPILER_FLAGS="$COMPILER_FLAGS $1"
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fi
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CFLAGS="$ac_save_CFLAGS"
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rm -f conftest*
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])
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