AX_EXT_HAVE_LIB(<directories>, <library>, <function>, <extra libraries>)
,
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cryp.to ac-archive's Installed Packages (released)
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
libraies 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 succeds 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.
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_TRY_LINK_FUNC([$3], [eval "ext_cv${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 ${new_libs}"
new_ldflags="-L${dir} ${new_ldflags}"
ext_lib_found="yes"
fi
fi
done
LIBS=$new_libs
LDFLAGS=$new_ldflags
])