| # Autoconf include file defining macros related to compile-time warnings. |
| |
| # Copyright 2004, 2005, 2007, 2009, 2011 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 3, 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 COPYING3. If not see |
| #<http://www.gnu.org/licenses/>. |
| |
| # ACX_PROG_CC_WARNING_OPTS(WARNINGS, [VARIABLE = WARN_CFLAGS) |
| # Sets @VARIABLE@ to the subset of the given options which the |
| # compiler accepts. |
| AC_DEFUN([ACX_PROG_CC_WARNING_OPTS], |
| [AC_REQUIRE([AC_PROG_CC])dnl |
| m4_pushdef([acx_Var], [m4_default([$2], [WARN_CFLAGS])])dnl |
| AC_SUBST(acx_Var)dnl |
| m4_expand_once([acx_Var= |
| ],m4_quote(acx_Var=))dnl |
| save_CFLAGS="$CFLAGS" |
| for real_option in $1; do |
| # Do the check with the no- prefix removed since gcc silently |
| # accepts any -Wno-* option on purpose |
| case $real_option in |
| -Wno-*) option=-W`expr x$real_option : 'x-Wno-\(.*\)'` ;; |
| *) option=$real_option ;; |
| esac |
| AS_VAR_PUSHDEF([acx_Woption], [acx_cv_prog_cc_warning_$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], |
| [acx_Var="$acx_Var${acx_Var:+ }$real_option"]) |
| AS_VAR_POPDEF([acx_Woption])dnl |
| done |
| CFLAGS="$save_CFLAGS" |
| m4_popdef([acx_Var])dnl |
| ])# ACX_PROG_CC_WARNING_OPTS |
| |
| # ACX_PROG_CC_WARNING_ALMOST_PEDANTIC(WARNINGS, [VARIABLE = WARN_PEDANTIC]) |
| # Append to VARIABLE "-pedantic" + the argument, if the compiler is GCC |
| # and accepts all of those options simultaneously, otherwise to nothing. |
| AC_DEFUN([ACX_PROG_CC_WARNING_ALMOST_PEDANTIC], |
| [AC_REQUIRE([AC_PROG_CC])dnl |
| m4_pushdef([acx_Var], [m4_default([$2], [WARN_PEDANTIC])])dnl |
| AC_SUBST(acx_Var)dnl |
| m4_expand_once([acx_Var= |
| ],m4_quote(acx_Var=))dnl |
| # Do the check with the no- prefix removed from the warning options |
| # since gcc silently accepts any -Wno-* option on purpose |
| m4_pushdef([acx_Woptions], [m4_bpatsubst([$1], [-Wno-], [-W])])dnl |
| AS_VAR_PUSHDEF([acx_Pedantic], [acx_cv_prog_cc_pedantic_]acx_Woptions)dnl |
| AS_IF([test "$GCC" = yes], |
| [AC_CACHE_CHECK([whether $CC supports -pedantic ]acx_Woptions, acx_Pedantic, |
| [save_CFLAGS="$CFLAGS" |
| CFLAGS="-pedantic acx_Woptions" |
| AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])], |
| [AS_VAR_SET(acx_Pedantic, yes)], |
| [AS_VAR_SET(acx_Pedantic, no)]) |
| CFLAGS="$save_CFLAGS"]) |
| AS_IF([test AS_VAR_GET(acx_Pedantic) = yes], |
| [acx_Var="$acx_Var${acx_Var:+ }-pedantic $1"]) |
| ]) |
| AS_VAR_POPDEF([acx_Pedantic])dnl |
| m4_popdef([acx_Woptions])dnl |
| m4_popdef([acx_Var])dnl |
| ])# ACX_PROG_CC_WARNING_ALMOST_PEDANTIC |
| |
| # ACX_PROG_CC_WARNINGS_ARE_ERRORS([x.y.z], [VARIABLE = WERROR]) |
| # sets @VARIABLE@ 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 @VARIABLE@ 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 |
| m4_pushdef([acx_Var], [m4_default([$2], [WERROR])])dnl |
| AC_SUBST(acx_Var)dnl |
| m4_expand_once([acx_Var= |
| ],m4_quote(acx_Var=))dnl |
| AC_ARG_ENABLE(werror-always, |
| AS_HELP_STRING([--enable-werror-always], |
| [enable -Werror despite compiler version]), |
| [], [enable_werror_always=no]) |
| AS_IF([test $enable_werror_always = yes], |
| [acx_Var="$acx_Var${acx_Var:+ }-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], |
| [acx_Var="$acx_Var${acx_Var:+ }-Werror"]) |
| AS_VAR_POPDEF([acx_GCCvers])]) |
| m4_popdef([acx_Var])dnl |
| ])# ACX_PROG_CC_WARNINGS_ARE_ERRORS |