1 # Autoconf include file defining macros related to compile-time warnings. 2 3 # Copyright 2004, 2005, 2007, 2009, 2011 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. 24 AC_DEFUN([ACX_PROG_CC_WARNING_OPTS], 25 [AC_REQUIRE([AC_PROG_CC])dnl 26 m4_pushdef([acx_Var], [m4_default([$2], [WARN_CFLAGS])])dnl 27 AC_SUBST(acx_Var)dnl 28 m4_expand_once([acx_Var= 29 ],m4_quote(acx_Var=))dnl 30 save_CFLAGS="$CFLAGS" 31 for real_option in $1; do 32 # Do the check with the no- prefix removed since gcc silently 33 # accepts any -Wno-* option on purpose 34 case $real_option in 35 -Wno-*) option=-W`expr x$real_option : 'x-Wno-\(.*\)'` ;; 36 *) option=$real_option ;; 37 esac 38 AS_VAR_PUSHDEF([acx_Woption], [acx_cv_prog_cc_warning_$option]) 39 AC_CACHE_CHECK([whether $CC supports $option], acx_Woption, 40 [CFLAGS="$option" 41 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])], 42 [AS_VAR_SET(acx_Woption, yes)], 43 [AS_VAR_SET(acx_Woption, no)]) 44 ]) 45 AS_IF([test AS_VAR_GET(acx_Woption) = yes], 46 [acx_Var="$acx_Var${acx_Var:+ }$real_option"]) 47 AS_VAR_POPDEF([acx_Woption])dnl 48 done 49 CFLAGS="$save_CFLAGS" 50 m4_popdef([acx_Var])dnl 51 ])# ACX_PROG_CC_WARNING_OPTS 52 53 # ACX_PROG_CC_WARNING_ALMOST_PEDANTIC(WARNINGS, [VARIABLE = WARN_PEDANTIC]) 54 # Append to VARIABLE "-pedantic" + the argument, if the compiler is GCC 55 # and accepts all of those options simultaneously, otherwise to nothing. 56 AC_DEFUN([ACX_PROG_CC_WARNING_ALMOST_PEDANTIC], 57 [AC_REQUIRE([AC_PROG_CC])dnl 58 m4_pushdef([acx_Var], [m4_default([$2], [WARN_PEDANTIC])])dnl 59 AC_SUBST(acx_Var)dnl 60 m4_expand_once([acx_Var= 61 ],m4_quote(acx_Var=))dnl 62 # Do the check with the no- prefix removed from the warning options 63 # since gcc silently accepts any -Wno-* option on purpose 64 m4_pushdef([acx_Woptions], [m4_bpatsubst([$1], [-Wno-], [-W])])dnl 65 AS_VAR_PUSHDEF([acx_Pedantic], [acx_cv_prog_cc_pedantic_]acx_Woptions)dnl 66 AS_IF([test "$GCC" = yes], 67 [AC_CACHE_CHECK([whether $CC supports -pedantic ]acx_Woptions, acx_Pedantic, 68 [save_CFLAGS="$CFLAGS" 69 CFLAGS="-pedantic acx_Woptions" 70 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])], 71 [AS_VAR_SET(acx_Pedantic, yes)], 72 [AS_VAR_SET(acx_Pedantic, no)]) 73 CFLAGS="$save_CFLAGS"]) 74 AS_IF([test AS_VAR_GET(acx_Pedantic) = yes], 75 [acx_Var="$acx_Var${acx_Var:+ }-pedantic $1"]) 76 ]) 77 AS_VAR_POPDEF([acx_Pedantic])dnl 78 m4_popdef([acx_Woptions])dnl 79 m4_popdef([acx_Var])dnl 80 ])# ACX_PROG_CC_WARNING_ALMOST_PEDANTIC 81 82 # ACX_PROG_CC_WARNINGS_ARE_ERRORS([x.y.z], [VARIABLE = WERROR]) 83 # sets @VARIABLE@ to "-Werror" if the compiler is GCC >=x.y.z, or if 84 # --enable-werror-always was given on the command line, otherwise 85 # to nothing. 86 # If the argument is the word "manual" instead of a version number, 87 # then @VARIABLE@ will be set to -Werror only if --enable-werror-always 88 # appeared on the configure command line. 89 AC_DEFUN([ACX_PROG_CC_WARNINGS_ARE_ERRORS], 90 [AC_REQUIRE([AC_PROG_CC])dnl 91 m4_pushdef([acx_Var], [m4_default([$2], [WERROR])])dnl 92 AC_SUBST(acx_Var)dnl 93 m4_expand_once([acx_Var= 94 ],m4_quote(acx_Var=))dnl 95 AC_ARG_ENABLE(werror-always, 96 AS_HELP_STRING([--enable-werror-always], 97 [enable -Werror despite compiler version]), 98 [], [enable_werror_always=no]) 99 AS_IF([test $enable_werror_always = yes], 100 [acx_Var="$acx_Var${acx_Var:+ }-Werror"]) 101 m4_if($1, [manual],, 102 [AS_VAR_PUSHDEF([acx_GCCvers], [acx_cv_prog_cc_gcc_$1_or_newer])dnl 103 AC_CACHE_CHECK([whether $CC is GCC >=$1], acx_GCCvers, 104 [set fnord `echo $1 | tr '.' ' '` 105 shift 106 AC_PREPROC_IFELSE( 107 [#if __GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__ \ 108 < [$]1 * 10000 + [$]2 * 100 + [$]3 109 #error insufficient 110 #endif], 111 [AS_VAR_SET(acx_GCCvers, yes)], 112 [AS_VAR_SET(acx_GCCvers, no)])]) 113 AS_IF([test AS_VAR_GET(acx_GCCvers) = yes], 114 [acx_Var="$acx_Var${acx_Var:+ }-Werror"]) 115 AS_VAR_POPDEF([acx_GCCvers])]) 116 m4_popdef([acx_Var])dnl 117 ])# ACX_PROG_CC_WARNINGS_ARE_ERRORS 118
