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# SYNOPSIS
#
# AX_CHECK_LIB(lib, required_version, search_libs, check_function, header, version_function, lib_dir)
#
# DESCRIPTION
#
# Check whether a function is found in a set of libraries and compare
# the library version to the required one.
#
# LAST MODIFICATION
#
# 2007-11-08
#
# COPYLEFT
#
# Copyright (c) 2006 Nicolas Calimet
#
# Copying and distribution of this file, with or without
# modification, are permitted in any medium without royalty provided
# the copyright notice and this notice are preserved.
AC_DEFUN([AX_CHECK_LIB],
[
ax_check_lib_save_cppflags="$CPPFLAGS"
ax_check_lib_save_ldflags="$LDFLAGS"
if test x"$7" != x""; then
CPPFLAGS="-I$7/../include $CPPFLAGS"
LDFLAGS="-L$7 $LDFLAGS"
fi
# check the library
AC_SEARCH_LIBS(
[$4],
[$3],
[
# check include file
AC_CHECK_HEADER(
[$5],
[
# check library version, update LIBS
AC_MSG_CHECKING([for lib$1 version >= $2])
AC_RUN_IFELSE(
[
AC_LANG_SOURCE(
[#include <stdio.h>
#include <string.h>
#include "$5"
int main (void)
{
const char *version = $6;
fprintf (stderr, "%s\n", version);
return 0;
}]
)
],
[
ax_check_lib_version=`eval $ac_try 2>&1`
AX_COMPARE_VERSION([$ax_check_lib_version], [ge], [$2], [ax_check_lib="ok"], [ax_check_lib="bad"])
AC_MSG_RESULT([$ax_check_lib_version, $ax_check_lib])
],
[
ax_check_lib="unknown"
AC_MSG_RESULT([$ax_check_lib])
],
[AC_MSG_RESULT([cross-compiling, forced])]
) # AC_RUN_IFELSE
],
[ax_check_lib="no headers"]
) # AC_CHECK_HEADER
],
[ax_check_lib="not found"],
[]
) # AC_SEARCH_LIBS
if test x"$ax_check_lib" != x"ok"; then
CPPFLAGS="$ax_check_lib_save_cppflags"
LDFLAGS="$ax_check_lib_save_ldflags"
fi
])
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