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## Copyright (c) 2009 Daniel Elstner <daniel.kitta@gmail.com>
##
## This file is part of mm-common.
##
## mm-common 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.
##
## mm-common 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 mm-common. If not, see <http://www.gnu.org/licenses/>.
#serial 20090804
## MM_ARG_ENABLE_WARNINGS(variable, min-flags, max-flags, [deprecation-prefixes])
##
## Provide the --enable-warnings configure argument, set to "min" by default.
## <min-flags> and <max-flags> should be space-separated lists of compiler
## warning flags to use with --enable-warnings=min or --enable-warnings=max,
## respectively. Warning level "fatal" is the same as "max" but in addition
## enables -Werror mode.
##
## If not empty, <deprecation-prefixes> should be a list of module prefixes
## which is expanded to -D<module>_DISABLE_DEPRECATED flags if fatal warnings
## are enabled, too.
##
AC_DEFUN([MM_ARG_ENABLE_WARNINGS],
[dnl
m4_assert([$# >= 3])[]dnl
dnl
AC_ARG_ENABLE([warnings],
[AS_HELP_STRING([[--enable-warnings[=min|max|fatal|no]]],
[set compiler pedantry level [default=min]])],
[mm_enable_warnings=$enableval],
[mm_enable_warnings=min])[]dnl
AS_CASE([$ac_compile],
[*'$CXXFLAGS '*], [mm_lang='C++' mm_cc=$CXX mm_conftest=conftest.${ac_ext-cc}],
[*'$CFLAGS '*], [mm_lang=C mm_cc=$CC mm_conftest=conftest.${ac_ext-c}],
[mm_lang=])[]dnl
AS_IF([test "x$mm_lang" != x],
[
AC_MSG_CHECKING([which $mm_lang compiler warning flags to use])
mm_deprecation_flags=
mm_tested_flags=
AS_CASE([$mm_enable_warnings],
[no], [mm_warning_flags=],
[max], [mm_warning_flags="$3"],
[fatal], [mm_warning_flags="$3 -Werror"][m4_ifval([$4], [
for mm_prefix in $4
do
mm_deprecation_flags="${mm_deprecation_flags}-D${mm_prefix}_DISABLE_DEPRECATED "
done])],
[mm_warning_flags="$2"])[]dnl
AS_IF([test "x$mm_warning_flags" != x],
[
# Keep in mind that the dummy source must be devoid of any
# problems that might cause diagnostics.
AC_LANG_CONFTEST([AC_LANG_SOURCE([[
int main(int argc, char** argv) { return (argv != 0) ? argc : 0; }
]])])
for mm_flag in $mm_warning_flags
do
# Test whether the compiler accepts the flag. GCC doesn't bail
# out when given an unsupported flag but prints a warning, so
# check the compiler output instead.
mm_cc_out=`$mm_cc $mm_tested_flags $mm_flag -c "$mm_conftest" 2>&1 || echo failed`
rm -f "conftest.${OBJEXT-o}"
AS_IF([test "x$mm_cc_out" = x],
[AS_IF([test "x$mm_tested_flags" = x],
[mm_tested_flags=$mm_flag],
[mm_tested_flags="$mm_tested_flags $mm_flag"])],
[cat <<_MMEOF >&AS_MESSAGE_LOG_FD
$mm_cc: $mm_cc_out
_MMEOF])
done
rm -f "$mm_conftest"
])
mm_all_flags=$mm_deprecation_flags$mm_tested_flags
AC_SUBST([$1], [$mm_all_flags])[]dnl
test "x$mm_all_flags" != x || mm_all_flags=none
AC_MSG_RESULT([$mm_all_flags])[]dnl
])[]dnl
])
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