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Diffstat (limited to 'm4-repo/dk-warn.m4')
-rw-r--r-- | m4-repo/dk-warn.m4 | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/m4-repo/dk-warn.m4 b/m4-repo/dk-warn.m4 new file mode 100644 index 00000000..90243bd8 --- /dev/null +++ b/m4-repo/dk-warn.m4 @@ -0,0 +1,114 @@ +## Copyright (c) 2004-2007 Daniel Elstner <daniel.kitta@gmail.com> +## +## This file is part of danielk's Autostuff. +## +## danielk's Autostuff 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. +## +## danielk's Autostuff 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 danielk's Autostuff; if not, write to the Free Software Foundation, +## Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + +#serial 20070116 + +## DK_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([DK_ARG_ENABLE_WARNINGS], +[dnl +m4_if([$3],, [AC_FATAL([3 arguments expected])])[]dnl +dnl +AC_ARG_ENABLE([warnings], [AS_HELP_STRING( + [--enable-warnings=@<:@min|max|fatal|no@:>@], + [control compiler pickyness @<:@min@:>@])], + [dk_enable_warnings=$enableval], + [dk_enable_warnings=min])[]dnl + +dk_lang= +case $ac_compile in + *'$CXXFLAGS '*) + dk_lang='C++' + dk_cc=$CXX + dk_conftest=conftest.${ac_ext-cc} + ;; + *'$CFLAGS '*) + dk_lang=C + dk_cc=$CC + dk_conftest=conftest.${ac_ext-c} + ;; +esac + +AS_IF([test "x$dk_lang" != x], +[ + AC_MSG_CHECKING([which $dk_lang compiler warning flags to use]) + + case $dk_enable_warnings in + no) dk_warning_flags=;; + max) dk_warning_flags="$3";; + fatal) dk_warning_flags="$3 -Werror";; + *) dk_warning_flags="$2";; + esac + + dk_deprecation_flags= +m4_if([$4],,, [ + AS_IF([test "x$dk_enable_warnings" = xfatal], + [ + dk_deprecation_prefixes="$4" + for dk_prefix in $dk_deprecation_prefixes + do + dk_deprecation_flags="${dk_deprecation_flags}-D${dk_prefix}_DISABLE_DEPRECATED " + done + ]) +])[]dnl + dk_tested_flags= + + AS_IF([test "x$dk_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 dk_flag in $dk_warning_flags + do + # Test whether the compiler accepts the flag. GCC doesn't bail + # out when given an unsupported flag but prints a warning, so + # check the compiler output instead. + dk_cc_out=`$dk_cc $dk_tested_flags $dk_flag -c "$dk_conftest" 2>&1 || echo failed` + rm -f "conftest.${OBJEXT-o}" + + AS_IF([test "x$dk_cc_out" = x], + [ + AS_IF([test "x$dk_tested_flags" = x], + [dk_tested_flags=$dk_flag], + [dk_tested_flags="$dk_tested_flags $dk_flag"]) + ], [ + echo "$dk_cc_out" >&AS_MESSAGE_LOG_FD + ]) + done + + rm -f "$dk_conftest" + ]) + dk_all_flags=$dk_deprecation_flags$dk_tested_flags + AC_SUBST([$1], [$dk_all_flags]) + + test "x$dk_all_flags" != x || dk_all_flags=none + AC_MSG_RESULT([$dk_all_flags]) +]) +]) |