1# Autoconf include file defining macros related to compile-time warnings. 2 3# Copyright 2004, 2005, 2007 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(WARNINGS, [VARIABLE = WARN_CFLAGS) 23# Sets @VARIABLE@ 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 27m4_pushdef([acx_Var], [m4_default([$2], [WARN_CFLAGS])])dnl 28AC_SUBST(acx_Var)dnl 29m4_expand_once([acx_Var= 30],m4_quote(acx_Var=))dnl 31save_CFLAGS="$CFLAGS" 32for option in $1; do 33 AS_VAR_PUSHDEF([acx_Woption], [acx_cv_prog_cc_warning_$option]) 34 AC_CACHE_CHECK([whether $CC supports $option], acx_Woption, 35 [CFLAGS="$option" 36 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])], 37 [AS_VAR_SET(acx_Woption, yes)], 38 [AS_VAR_SET(acx_Woption, no)]) 39 ]) 40 AS_IF([test AS_VAR_GET(acx_Woption) = yes], 41 [acx_Var="$acx_Var${acx_Var:+ }$option"]) 42 AS_VAR_POPDEF([acx_Woption])dnl 43done 44CFLAGS="$save_CFLAGS" 45m4_popdef([acx_Var])dnl 46])# ACX_PROG_CC_WARNING_OPTS 47 48# ACX_PROG_CC_WARNING_ALMOST_PEDANTIC(WARNINGS, [VARIABLE = WARN_PEDANTIC) 49# Append to VARIABLE "-pedantic" + the argument, if the compiler is GCC 50# and accepts all of those options simultaneously, otherwise to nothing. 51AC_DEFUN([ACX_PROG_CC_WARNING_ALMOST_PEDANTIC], 52[AC_REQUIRE([AC_PROG_CC])dnl 53m4_pushdef([acx_Var], [m4_default([$2], [WARN_PEDANTIC])])dnl 54AC_SUBST(acx_Var)dnl 55m4_expand_once([acx_Var= 56],m4_quote(acx_Var=))dnl 57AS_VAR_PUSHDEF([acx_Pedantic], [acx_cv_prog_cc_pedantic_$1])dnl 58AS_IF([test "$GCC" = yes], 59[AC_CACHE_CHECK([whether $CC supports -pedantic $1], acx_Pedantic, 60[save_CFLAGS="$CFLAGS" 61CFLAGS="-pedantic $1" 62AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])], 63 [AS_VAR_SET(acx_Pedantic, yes)], 64 [AS_VAR_SET(acx_Pedantic, no)]) 65CFLAGS="$save_CFLAGS"]) 66AS_IF([test AS_VAR_GET(acx_Pedantic) = yes], 67 [acx_Var="$acx_Var${acx_Var:+ }-pedantic $1"]) 68]) 69AS_VAR_POPDEF([acx_Pedantic])dnl 70m4_popdef([acx_Var])dnl 71])# ACX_PROG_CC_WARNING_ALMOST_PEDANTIC 72 73# ACX_PROG_CC_WARNINGS_ARE_ERRORS([x.y.z], [VARIABLE = WERROR]) 74# sets @VARIABLE@ to "-Werror" if the compiler is GCC >=x.y.z, or if 75# --enable-werror-always was given on the command line, otherwise 76# to nothing. 77# If the argument is the word "manual" instead of a version number, 78# then @VARIABLE@ will be set to -Werror only if --enable-werror-always 79# appeared on the configure command line. 80AC_DEFUN([ACX_PROG_CC_WARNINGS_ARE_ERRORS], 81[AC_REQUIRE([AC_PROG_CC])dnl 82m4_pushdef([acx_Var], [m4_default([$2], [WERROR])])dnl 83AC_SUBST(acx_Var)dnl 84m4_expand_once([acx_Var= 85],m4_quote(acx_Var=))dnl 86AC_ARG_ENABLE(werror-always, 87 AS_HELP_STRING([--enable-werror-always], 88 [enable -Werror despite compiler version]), 89[], [enable_werror_always=no]) 90AS_IF([test $enable_werror_always = yes], 91 [acx_Var="$acx_Var${acx_Var:+ }-Werror"]) 92 m4_if($1, [manual],, 93 [AS_VAR_PUSHDEF([acx_GCCvers], [acx_cv_prog_cc_gcc_$1_or_newer])dnl 94 AC_CACHE_CHECK([whether $CC is GCC >=$1], acx_GCCvers, 95 [set fnord `echo $1 | tr '.' ' '` 96 shift 97 AC_PREPROC_IFELSE( 98[#if __GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__ \ 99 < [$]1 * 10000 + [$]2 * 100 + [$]3 100#error insufficient 101#endif], 102 [AS_VAR_SET(acx_GCCvers, yes)], 103 [AS_VAR_SET(acx_GCCvers, no)])]) 104 AS_IF([test AS_VAR_GET(acx_GCCvers) = yes], 105 [acx_Var="$acx_Var${acx_Var:+ }-Werror"]) 106 AS_VAR_POPDEF([acx_GCCvers])]) 107m4_popdef([acx_Var])dnl 108])# ACX_PROG_CC_WARNINGS_ARE_ERRORS 109