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   Autoconf Macro: ax_c_check_flag
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  <h1>
   ax_c_check_flag
  </h1>
  <h2>
   Synopsis
  </h2>
  <p class="indent" style="white-space:nowrap;">
   <code>AX_C_CHECK_FLAG(FLAG-TO-CHECK,[PROLOGUE],[BODY],[ACTION-IF-SUCCESS],[ACTION-IF-FAILURE])</code>
  </p>
  <h2>
   Description
  </h2>
  <div class="indent">
   <p>
    This macro tests if the C compiler supports the flag FLAG-TO-CHECK. If
    successfull execute ACTION-IF-SUCCESS otherwise ACTION-IF-FAILURE. PROLOGUE
    and BODY are optional and should be used as in AC_LANG_PROGRAM macro.
   </p>
   <p>
    This code is inspired from KDE_CHECK_COMPILER_FLAG macro. Thanks to Bogdan
    Drozdowski &lt;bogdandr@op.pl&gt; for testing and bug fixes.
   </p>
  </div>
  <h2>
   Author
  </h2>
  <p class="indent">
   Francesco Salvestrini &lt;salvestrini@users.sourceforge.net&gt;
  </p>
  <h2>
   Last Modified
  </h2>
  <p class="indent">
   2007-11-26
  </p>
  <h2>
   Cross References
  </h2>
  <p class="indent">
   <img src="group25-xrefs.png" alt="group25-xrefs.png" usemap=
   "#group25"><map id="group25" name="group25">
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  </p>
  <h2>
   M4 Source Code
  </h2>
  <div class="indent">
   <pre class="m4source">
AC_DEFUN([AX_C_CHECK_FLAG],[
  AC_PREREQ([2.61])
  AC_REQUIRE([AC_PROG_CC])
  AC_REQUIRE([AC_PROG_SED])

  flag=`echo "$1" | $SED 'y% .=/+-(){}&lt;&gt;:*,%_______________%'`

  AC_CACHE_CHECK([whether the C compiler accepts the $1 flag],
    [ax_cv_c_check_flag_$flag],[

    AC_LANG_PUSH([C])

    save_CFLAGS="$CFLAGS"
    CFLAGS="$CFLAGS $1"
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([$2],[$3])
    ],[
      eval "ax_cv_c_check_flag_$flag=yes"
    ],[
      eval "ax_cv_c_check_flag_$flag=no"
    ])

    CFLAGS="$save_CFLAGS"

    AC_LANG_POP

  ])

  AS_IF([eval "test \"`echo '$ax_cv_c_check_flag_'$flag`\" = yes"],[
    :
    $4
  ],[
    :
    $5
  ])
])
</pre>
  </div>
  <h2>
   License
  </h2>
  <div class="indent">
   <span style="white-space:nowrap;">Copyright &copy; 2007 Francesco
   Salvestrini &lt;salvestrini@users.sourceforge.net&gt;</span>
   <p>
    This program 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 of the License, or (at your option)
    any later version.
   </p>
   <p>
    This program 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.
   </p>
   <p>
    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc., 59
    Temple Place - Suite 330, Boston, MA 02111-1307, USA.
   </p>
   <p>
    As a special exception, the respective Autoconf Macro's copyright owner
    gives unlimited permission to copy, distribute and modify the configure
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