diff options
Diffstat (limited to 'config/warnings.m4')
| -rw-r--r-- | config/warnings.m4 | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/config/warnings.m4 b/config/warnings.m4 new file mode 100644 index 0000000..5501be9 --- /dev/null +++ b/config/warnings.m4 @@ -0,0 +1,97 @@ +# Autoconf include file defining macros related to compile-time warnings. + +# Copyright 2004 Free Software Foundation, Inc. + +#This file is part of GCC. + +#GCC 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, or (at your option) any later +#version. + +#GCC 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 GCC; see the file COPYING. If not, write to the Free +#Software Foundation, 59 Temple Place - Suite 330, Boston, MA +#02111-1307, USA. + +# ACX_PROG_CC_WARNING_OPTS([-Wfoo -Wbar -Wbaz]) +# Sets @WARN_CFLAGS@ to the subset of the given options which the +# compiler accepts. +AC_DEFUN([ACX_PROG_CC_WARNING_OPTS], +[AC_REQUIRE([AC_PROG_CC])dnl +AC_SUBST([WARN_CFLAGS])dnl +WARN_CFLAGS= +save_CFLAGS="$CFLAGS" +for option in $1; do + AS_VAR_PUSHDEF([acx_Woption], [acx_cv_prog_cc_warning_$option]) + AC_CACHE_CHECK([whether $CC supports $option], acx_Woption, + [CFLAGS="$option" + AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])], + [AS_VAR_SET(acx_Woption, yes)], + [AS_VAR_SET(acx_Woption, no)]) + ]) + AS_IF([test AS_VAR_GET(acx_Woption) = yes], + [WARN_CFLAGS="$WARN_CFLAGS${WARN_CFLAGS:+ }$option"]) + AS_VAR_POPDEF([acx_Woption])dnl +done +CFLAGS="$save_CFLAGS" +])# ACX_PROG_CC_WARNING_OPTS + +# ACX_PROG_CC_WARNING_ALMOST_PEDANTIC([-Wno-long-long ...]) +# Sets WARN_PEDANTIC to "-pedantic" + the argument, if the compiler +# accepts all of those options simultaneously, otherwise to nothing. +AC_DEFUN([ACX_PROG_CC_WARNING_ALMOST_PEDANTIC], +[AC_REQUIRE([AC_PROG_CC])dnl +AC_SUBST([WARN_PEDANTIC])dnl +AS_VAR_PUSHDEF([acx_Pedantic], [acx_cv_prog_cc_pedantic_$1])dnl +WARN_PEDANTIC= +AC_CACHE_CHECK([whether $CC supports -pedantic $1], acx_Pedantic, +[save_CFLAGS="$CFLAGS" +CFLAGS="-pedantic $1" +AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])], + [AS_VAR_SET(acx_Pedantic, yes)], + [AS_VAR_SET(acx_Pedantic, no)]) +CFLAGS="$save_CFLAGS"]) +AS_IF([test AS_VAR_GET(acx_Pedantic) = yes], + [WARN_PEDANTIC="-pedantic $1"]) +AS_VAR_POPDEF([acx_Pedantic])dnl +])# ACX_PROG_CC_WARNING_ALMOST_PEDANTIC + +# ACX_PROG_CC_WARNINGS_ARE_ERRORS([x.y.z]) +# sets WERROR to "-Werror" if the compiler is GCC >=x.y.z, or if +# --enable-werror-always was given on the command line, otherwise +# to nothing. +# If the argument is the word "manual" instead of a version number, +# then WERROR will be set to -Werror only if --enable-werror-always +# appeared on the configure command line. +AC_DEFUN([ACX_PROG_CC_WARNINGS_ARE_ERRORS], +[AC_REQUIRE([AC_PROG_CC])dnl +AC_SUBST([WERROR])dnl +WERROR= +AC_ARG_ENABLE(werror-always, + AS_HELP_STRING([--enable-werror-always], + [enable -Werror despite compiler version]), +[], [enable_werror_always=no]) +AS_IF([test $enable_werror_always = yes], + [WERROR=-Werror], + m4_if($1, [manual],, + [AS_VAR_PUSHDEF([acx_GCCvers], [acx_cv_prog_cc_gcc_$1_or_newer])dnl + AC_CACHE_CHECK([whether $CC is GCC >=$1], acx_GCCvers, + [set fnord `echo $1 | tr '.' ' '` + shift + AC_PREPROC_IFELSE( +[#if __GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__ \ + < [$]1 * 10000 + [$]2 * 100 + [$]3 +#error insufficient +#endif], + [AS_VAR_SET(acx_GCCvers, yes)], + [AS_VAR_SET(acx_GCCvers, no)])]) + AS_IF([test AS_VAR_GET(acx_GCCvers) = yes], + [WERROR=-WerrorB]) + AS_VAR_POPDEF([acx_GCCvers])])) +])# ACX_PROG_CC_WARNINGS_ARE_ERRORS |