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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_ext_have_lib.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_EXT_HAVE_LIB(<directories>, <library>, <function>, <extra libraries>)
#
# DESCRIPTION
#
# AX_EXT_HAVE_LIB is identical to AC_SEARCH_LIBS with the exception that
# will add -L<directory> when looking, and use a different variable for
# each directory.
#
# Any required -L<directory> flags are added to LDFLAGS and located
# libraries are added to LIBS
#
# Some libraries are unlinkable without other extra libraries, which can
# be specified in the 4th argument. The mysql client library needs -lz,
# for example.
#
# Example:
#
# AX_EXT_HAVE_LIB(/lib /usr/lib /usr/local/lib /usr/lib/mysql /usr/local/mysql/lib, mysqlclient, mysql_init, [-lz])
#
# which finds the mysql client library if succeeds system when it tries
# with -L/usr/lib/mysql then it adds -lmysqlclient to LIBS and
# -L/usr/lib/mysql to LDFLAGS.
#
# The test itself is based on the autoconf 2.53 version of AC_SEARCH_LIBS.
#
# LICENSE
#
# Copyright (c) 2008 Duncan Simpson <dps@simpson.demon.co.uk>
#
# 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. This file is offered as-is, without any
# warranty.
#serial 13
AC_DEFUN([AX_EXT_HAVE_LIB],
[
new_ldflags=${LDFLAGS}
new_libs=$LIBS
AC_CHECK_LIB([$2], $3, new_libs="-l$2"; ext_lib_found="yes", ext_lib_found="no")
for dir in $1
do
if test $ext_lib_found = no
then
ext_haslib_cvdir=`echo $dir | $as_tr_sh`
AC_CACHE_CHECK([for $2 library with -L$dir], [ext_cv${ext_haslib_cvdir}_haslib_$2],
[ext_func_search_save_LIBS=$LIBS
ext_func_save_ldflags=${LDFLAGS}
LIBS="-l$2 $4 ${ext_func_search_save_LIBS}"
LDFLAGS="-L$dir ${ext_func_save_ldflags}"
AC_LINK_IFELSE([AC_LANG_CALL([], [$3])], [eval "ext_cv${ext_haslib_cvdir}_haslib_$2"="yes"],
[eval "ext_cv${ext_haslib_cvdir}_haslib_$2"="no"])
LIBS=$ext_func_search_save_LIBS
LDFLAGS=$ext_func_save_ldflags
])
if eval `echo 'test x${'ext_cv${ext_haslib_cvdir}_haslib_$2'}' = "xyes"`; then
new_libs="-l$2"
new_ldflags="-L${dir} ${new_ldflags}"
ext_lib_found="yes"
fi
fi
done
LIBS="$new_libs ${LIBS}"
LDFLAGS=$new_ldflags
])
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