1# Autoconf include file defining macros related to compile-time warnings. 2 3# Copyright 2004, 2005 Free Software Foundation, Inc. 4 5#This file is part of GCC. 6 7#GCC is free software; you can redistribute it and/or modify it under 8#the terms of the GNU General Public License as published by the Free 9#Software Foundation; either version 2, or (at your option) any later 10#version. 11 12#GCC is distributed in the hope that it will be useful, but WITHOUT 13#ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14#FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15#for more details. 16 17#You should have received a copy of the GNU General Public License 18#along with GCC; see the file COPYING. If not, write to the Free 19#Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 20#02110-1301, USA. 21 22# ACX_PROG_CC_WARNING_OPTS([-Wfoo -Wbar -Wbaz]) 23# Sets @WARN_CFLAGS@ to the subset of the given options which the 24# compiler accepts. 25AC_DEFUN([ACX_PROG_CC_WARNING_OPTS], 26[AC_REQUIRE([AC_PROG_CC])dnl 27AC_SUBST([WARN_CFLAGS])dnl 28WARN_CFLAGS= 29save_CFLAGS="$CFLAGS" 30for option in $1; do 31 AS_VAR_PUSHDEF([acx_Woption], [acx_cv_prog_cc_warning_$option]) 32 AC_CACHE_CHECK([whether $CC supports $option], acx_Woption, 33 [CFLAGS="$option" 34 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])], 35 [AS_VAR_SET(acx_Woption, yes)], 36 [AS_VAR_SET(acx_Woption, no)]) 37 ]) 38 AS_IF([test AS_VAR_GET(acx_Woption) = yes], 39 [WARN_CFLAGS="$WARN_CFLAGS${WARN_CFLAGS:+ }$option"]) 40 AS_VAR_POPDEF([acx_Woption])dnl 41done 42CFLAGS="$save_CFLAGS" 43])# ACX_PROG_CC_WARNING_OPTS 44 45# ACX_PROG_CC_WARNING_ALMOST_PEDANTIC([-Wno-long-long ...]) 46# Sets WARN_PEDANTIC to "-pedantic" + the argument, if the compiler is GCC 47# and accepts all of those options simultaneously, otherwise to nothing. 48AC_DEFUN([ACX_PROG_CC_WARNING_ALMOST_PEDANTIC], 49[AC_REQUIRE([AC_PROG_CC])dnl 50AC_SUBST([WARN_PEDANTIC])dnl 51AS_VAR_PUSHDEF([acx_Pedantic], [acx_cv_prog_cc_pedantic_$1])dnl 52WARN_PEDANTIC= 53AS_IF([test "$GCC" = yes], 54[AC_CACHE_CHECK([whether $CC supports -pedantic $1], acx_Pedantic, 55[save_CFLAGS="$CFLAGS" 56CFLAGS="-pedantic $1" 57AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])], 58 [AS_VAR_SET(acx_Pedantic, yes)], 59 [AS_VAR_SET(acx_Pedantic, no)]) 60CFLAGS="$save_CFLAGS"]) 61AS_IF([test AS_VAR_GET(acx_Pedantic) = yes], 62 [WARN_PEDANTIC="-pedantic $1"]) 63]) 64AS_VAR_POPDEF([acx_Pedantic])dnl 65])# ACX_PROG_CC_WARNING_ALMOST_PEDANTIC 66 67# ACX_PROG_CC_WARNINGS_ARE_ERRORS([x.y.z]) 68# sets WERROR to "-Werror" if the compiler is GCC >=x.y.z, or if 69# --enable-werror-always was given on the command line, otherwise 70# to nothing. 71# If the argument is the word "manual" instead of a version number, 72# then WERROR will be set to -Werror only if --enable-werror-always 73# appeared on the configure command line. 74AC_DEFUN([ACX_PROG_CC_WARNINGS_ARE_ERRORS], 75[AC_REQUIRE([AC_PROG_CC])dnl 76AC_SUBST([WERROR])dnl 77WERROR= 78AC_ARG_ENABLE(werror-always, 79 AS_HELP_STRING([--enable-werror-always], 80 [enable -Werror despite compiler version]), 81[], [enable_werror_always=no]) 82AS_IF([test $enable_werror_always = yes], 83 [WERROR=-Werror], 84 m4_if($1, [manual],, 85 [AS_VAR_PUSHDEF([acx_GCCvers], [acx_cv_prog_cc_gcc_$1_or_newer])dnl 86 AC_CACHE_CHECK([whether $CC is GCC >=$1], acx_GCCvers, 87 [set fnord `echo $1 | tr '.' ' '` 88 shift 89 AC_PREPROC_IFELSE( 90[#if __GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__ \ 91 < [$]1 * 10000 + [$]2 * 100 + [$]3 92#error insufficient 93#endif], 94 [AS_VAR_SET(acx_GCCvers, yes)], 95 [AS_VAR_SET(acx_GCCvers, no)])]) 96 AS_IF([test AS_VAR_GET(acx_GCCvers) = yes], 97 [WERROR=-WerrorB]) 98 AS_VAR_POPDEF([acx_GCCvers])])) 99])# ACX_PROG_CC_WARNINGS_ARE_ERRORS 100