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# Autoconf include file defining macros related to compile-time warnings.

# Copyright 2004, 2005 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 2, 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 COPYING.  If not, write to the Free

#Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA

#02110-1301, USA.

# ACX_PROG_CC_WARNING_OPTS([-Wfoo -Wbar -Wbaz])

#   Sets @WARN_CFLAGS@ to the subset of the given options which the

#   compiler accepts.

AC_DEFUN([ACX_PROG_CC_WARNING_OPTS],

[AC_REQUIRE([AC_PROG_CC])dnl

AC_SUBST([WARN_CFLAGS])dnl

WARN_CFLAGS=

save_CFLAGS="$CFLAGS"

for option in $1; do

  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],

        [WARN_CFLAGS="$WARN_CFLAGS${WARN_CFLAGS:+ }$option"])

  AS_VAR_POPDEF([acx_Woption])dnl

done

CFLAGS="$save_CFLAGS"

])# ACX_PROG_CC_WARNING_OPTS

# ACX_PROG_CC_WARNING_ALMOST_PEDANTIC([-Wno-long-long ...])

#   Sets WARN_PEDANTIC to "-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

AC_SUBST([WARN_PEDANTIC])dnl

AS_VAR_PUSHDEF([acx_Pedantic], [acx_cv_prog_cc_pedantic_$1])dnl

WARN_PEDANTIC=

AS_IF([test "$GCC" = yes],

[AC_CACHE_CHECK([whether $CC supports -pedantic $1], acx_Pedantic,

[save_CFLAGS="$CFLAGS"

CFLAGS="-pedantic $1"

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],

      [WARN_PEDANTIC="-pedantic $1"])

])

AS_VAR_POPDEF([acx_Pedantic])dnl

])# ACX_PROG_CC_WARNING_ALMOST_PEDANTIC

# ACX_PROG_CC_WARNINGS_ARE_ERRORS([x.y.z])

#   sets WERROR 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 WERROR 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

AC_SUBST([WERROR])dnl

WERROR=

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],

      [WERROR=-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],

       [WERROR=-WerrorB])

  AS_VAR_POPDEF([acx_GCCvers])]))

])# ACX_PROG_CC_WARNINGS_ARE_ERRORS