1# Autoconf include file defining macros related to compile-time warnings. 2 3# Copyright 2004, 2005, 2007, 2009 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 3, 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 COPYING3. If not see 19#<http://www.gnu.org/licenses/>. 20 21# ACX_PROG_CC_WARNING_OPTS(WARNINGS, [VARIABLE = WARN_CFLAGS) 22# Sets @VARIABLE@ to the subset of the given options which the 23# compiler accepts. 24AC_DEFUN([ACX_PROG_CC_WARNING_OPTS], 25[AC_REQUIRE([AC_PROG_CC])dnl 26m4_pushdef([acx_Var], [m4_default([$2], [WARN_CFLAGS])])dnl 27AC_SUBST(acx_Var)dnl 28m4_expand_once([acx_Var= 29],m4_quote(acx_Var=))dnl 30save_CFLAGS="$CFLAGS" 31for option in $1; do 32 AS_VAR_PUSHDEF([acx_Woption], [acx_cv_prog_cc_warning_$option]) 33 AC_CACHE_CHECK([whether $CC supports $option], acx_Woption, 34 [CFLAGS="$option" 35 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])], 36 [AS_VAR_SET(acx_Woption, yes)], 37 [AS_VAR_SET(acx_Woption, no)]) 38 ]) 39 AS_IF([test AS_VAR_GET(acx_Woption) = yes], 40 [acx_Var="$acx_Var${acx_Var:+ }$option"]) 41 AS_VAR_POPDEF([acx_Woption])dnl 42done 43CFLAGS="$save_CFLAGS" 44m4_popdef([acx_Var])dnl 45])# ACX_PROG_CC_WARNING_OPTS 46 47# ACX_PROG_CC_WARNING_ALMOST_PEDANTIC(WARNINGS, [VARIABLE = WARN_PEDANTIC) 48# Append to VARIABLE "-pedantic" + the argument, if the compiler is GCC 49# and accepts all of those options simultaneously, otherwise to nothing. 50AC_DEFUN([ACX_PROG_CC_WARNING_ALMOST_PEDANTIC], 51[AC_REQUIRE([AC_PROG_CC])dnl 52m4_pushdef([acx_Var], [m4_default([$2], [WARN_PEDANTIC])])dnl 53AC_SUBST(acx_Var)dnl 54m4_expand_once([acx_Var= 55],m4_quote(acx_Var=))dnl 56AS_VAR_PUSHDEF([acx_Pedantic], [acx_cv_prog_cc_pedantic_$1])dnl 57AS_IF([test "$GCC" = yes], 58[AC_CACHE_CHECK([whether $CC supports -pedantic $1], acx_Pedantic, 59[save_CFLAGS="$CFLAGS" 60CFLAGS="-pedantic $1" 61AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])], 62 [AS_VAR_SET(acx_Pedantic, yes)], 63 [AS_VAR_SET(acx_Pedantic, no)]) 64CFLAGS="$save_CFLAGS"]) 65AS_IF([test AS_VAR_GET(acx_Pedantic) = yes], 66 [acx_Var="$acx_Var${acx_Var:+ }-pedantic $1"]) 67]) 68AS_VAR_POPDEF([acx_Pedantic])dnl 69m4_popdef([acx_Var])dnl 70])# ACX_PROG_CC_WARNING_ALMOST_PEDANTIC 71 72# ACX_PROG_CC_WARNINGS_ARE_ERRORS([x.y.z], [VARIABLE = WERROR]) 73# sets @VARIABLE@ to "-Werror" if the compiler is GCC >=x.y.z, or if 74# --enable-werror-always was given on the command line, otherwise 75# to nothing. 76# If the argument is the word "manual" instead of a version number, 77# then @VARIABLE@ will be set to -Werror only if --enable-werror-always 78# appeared on the configure command line. 79AC_DEFUN([ACX_PROG_CC_WARNINGS_ARE_ERRORS], 80[AC_REQUIRE([AC_PROG_CC])dnl 81m4_pushdef([acx_Var], [m4_default([$2], [WERROR])])dnl 82AC_SUBST(acx_Var)dnl 83m4_expand_once([acx_Var= 84],m4_quote(acx_Var=))dnl 85AC_ARG_ENABLE(werror-always, 86 AS_HELP_STRING([--enable-werror-always], 87 [enable -Werror despite compiler version]), 88[], [enable_werror_always=no]) 89AS_IF([test $enable_werror_always = yes], 90 [acx_Var="$acx_Var${acx_Var:+ }-Werror"]) 91 m4_if($1, [manual],, 92 [AS_VAR_PUSHDEF([acx_GCCvers], [acx_cv_prog_cc_gcc_$1_or_newer])dnl 93 AC_CACHE_CHECK([whether $CC is GCC >=$1], acx_GCCvers, 94 [set fnord `echo $1 | tr '.' ' '` 95 shift 96 AC_PREPROC_IFELSE( 97[#if __GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__ \ 98 < [$]1 * 10000 + [$]2 * 100 + [$]3 99#error insufficient 100#endif], 101 [AS_VAR_SET(acx_GCCvers, yes)], 102 [AS_VAR_SET(acx_GCCvers, no)])]) 103 AS_IF([test AS_VAR_GET(acx_GCCvers) = yes], 104 [acx_Var="$acx_Var${acx_Var:+ }-Werror"]) 105 AS_VAR_POPDEF([acx_GCCvers])]) 106m4_popdef([acx_Var])dnl 107])# ACX_PROG_CC_WARNINGS_ARE_ERRORS 108