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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">
<head>
<title>
Autoconf Macro: ax_ext_check_header
</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/ax_ext_check_header.m4">Download
M4 Source</a>
</td>
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<a href="macros-by-category.html">Macro Index Page</a>
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</tr>
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<hr>
<h1>
ax_ext_check_header
</h1>
<h2>
Synopsis
</h2>
<p class="indent" style="white-space:nowrap;">
<code>AX_EXT_CHECK_HEADER(<header>, <paths>).</code>
</p>
<h2>
Description
</h2>
<div class="indent">
<p>
Check for <header> with -I<path> for each path in <paths>
if need be. The first sucecssful path is chosen (eg if you say
AX_EXT_CHECK_HEADER(foo.h, bar baz qux) and -Ibaz works then -Iqux will not
be tested.
</p>
<p>
Any -I flags that locate a header are added to CFLAGS and CPPFLAGS. AS with
AC_CHECK_HEADERS it causes HAVE_<header>_H to be defined as 1.
</p>
<p>
Example:
</p>
<pre>
AX_EXT_HAVE_HEADER(openssl/rsa.h, /usr/local/include /usr/local/ssl/include /usr/local/openssl/include)
</pre>
</div>
<h2>
Author
</h2>
<p class="indent">
Duncan Simpson <dps@simpson.demon.co.uk>
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2005-01-21
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
AC_DEFUN([AX_EXT_HAVE_HEADER],
[AC_LANG_PUSH(C)
AC_CHECK_HEADER($1, [$3 got="yes"], [$4 got="no"], $5)
hdr=`echo $1 | $as_tr_sh`
for dir in $2; do
if test "x${got}" = "xno"; then
ext_hashdr_cvdir=`echo $dir | $as_tr_sh`
AC_CACHE_CHECK([for $1 library with -I$dir],
[ext_cv${ext_hashdr_cvdir}_hashdr_${hdr}],
[ext_have_hdr_save_cflags=${CFLAGS}
CFLAGS="${CFLAGS} -I${dir}"
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([#inc[]lude <$1>])],
[got="yes"; eval "ext_cv${ext_hashdr_cvdir}_hashdr_${hdr}"="yes"],
[got="no"; eval "ext_cv${ext_hashdr_cvdir}_hashdr_${hdr}"="no"])
CFLAGS=$ext_have_hdr_save_cflags])
if eval `echo 'test x${'ext_cv${ext_hashdr_cvdir}_hashdr_${hdr}'}' = "xyes"`; then
CFLAGS="${CFLAGS} -I${dir}"
CPPFLAGS="${CPPFLAGS} -I${dir}"
got="yes";
hdr=`echo $1 | $as_tr_cpp`
AC_DEFINE_UNQUOTED(HAVE_${hdr}, 1,
[Define this if you have the $1 header])
fi; fi; done
AC_LANG_POP])
</pre>
</div>
</body>
</html>
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