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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
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<head>
<title>
Autoconf Macro: ac_check_symbol
</title>
<link rel="stylesheet" type="text/css" href="ac-archive.css">
</head>
<body>
<table summary="web navigation" style="width:100%;">
<tbody>
<tr>
<td style="width:50%;" align="center">
<a href="http://autoconf-archive.cryp.to/ac_check_symbol.m4">Download M4
Source</a>
</td>
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<a href="macros-by-category.html">Macro Index Page</a>
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<hr>
<h1>
ac_check_symbol
</h1>
<h2>
Synopsis
</h2>
<p class="indent" style="white-space:nowrap;">
<code>AC_CHECK_SYMBOL(SYMBOL, HEADER... [,ACTION-IF-FOUND
[,ACTION-IF-NOT-FOUND]])</code>
</p>
<h2>
Description
</h2>
<div class="indent">
<p>
a wrapper around AC_EGREP_HEADER the shellvar $ac_found will hold the
HEADER-name that had been containing the symbol. This value is shown to the
user.
</p>
</div>
<h2>
Author
</h2>
<p class="indent">
Guido Draheim <guidod@gmx.de>
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2005-12-18
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
AC_DEFUN([AC_CHECK_SYMBOL],
[AC_MSG_CHECKING([for $1 in $2])
AC_CACHE_VAL(ac_cv_func_$1,
[AC_REQUIRE_CPP()dnl
changequote(, )dnl
symbol="[^a-zA-Z_0-9]$1[^a-zA-Z_0-9]"
changequote([, ])dnl
ac_found=no
for ac_header in $2 ; do
ac_safe=`echo "$ac_header" | sed 'y%./+-%__p_%' `
if test $ac_found != "yes" ; then
if eval "test \"`echo '$ac_cv_header_'$ac_safe`\" = yes"; then
AC_EGREP_HEADER( $symbol, $ac_header, [ac_found="$ac_header"] )
fi
fi
done
if test "$ac_found" != "no" ; then
AC_MSG_RESULT($ac_found)
ifelse([$3], , :, [$3])
else
AC_MSG_RESULT(no)
ifelse([$4], , , [$4
])dnl
fi
])])
dnl AC_CHECK_SYMBOLS( symbol..., header... [, action-if-found [, action-if-not-found]])
AC_DEFUN([AC_CHECK_SYMBOLS],
[for ac_func in $1
do
P4_CHECK_SYMBOL($ac_func, $2,
[changequote(, )dnl
ac_tr_func=HAVE_`echo $ac_func | sed -e 'y:abcdefghijklmnopqrstuvwxyz:ABCDEFGHIJKLMNOPQRSTUVWXYZ:' -e 's:[[^A-Z0-9]]:_:'`
changequote([, ])dnl
AC_DEFINE_UNQUOTED($ac_tr_func) $2], $3)dnl
done
])
</pre>
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