Add autoconf system provided by Boris Manojlovic

[blerg.git] / m4 / yajl.m4

diff --git a/m4/yajl.m4 b/m4/yajl.m4
new file mode 100644 (file)
index 0000000..a946666
--- /dev/null
+++ b/m4/yajl.m4
@@ -0,0 +1,100 @@
+# ===========================================================================
+#       URL
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_CHECK_YAJL()
+#
+# DESCRIPTION
+#
+#
+# LICENSE
+#
+#   Copyright (c) 2011 Boris Manojlovic <boris@steki.net>
+#
+#   This program is free software; you can redistribute it and/or modify it
+#   under the terms of the GNU General Public License as published by the
+#   Free Software Foundation; either version 2 of the License, or (at your
+#   option) any later version.
+#
+#   This program is distributed in the hope that it will be useful, but
+#   WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+#   Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License along
+#   with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+#   As a special exception, the respective Autoconf Macro's copyright owner
+#   gives unlimited permission to copy, distribute and modify the configure
+#   scripts that are the output of Autoconf when processing the Macro. You
+#   need not follow the terms of the GNU General Public License when using
+#   or distributing such scripts, even though portions of the text of the
+#   Macro appear in them. The GNU General Public License (GPL) does govern
+#   all other use of the material that constitutes the Autoconf Macro.
+#
+#   This special exception to the GPL applies to versions of the Autoconf
+#   Macro released by the Autoconf Archive. When you make and distribute a
+#   modified version of the Autoconf Macro, you may extend this special
+#   exception to the GPL to apply to your modified version as well.
+
+#serial 1
+
+AU_ALIAS([CHECK_YAJL], [AX_CHECK_YAJL])
+AC_DEFUN([AX_CHECK_YAJL],
+#
+# Handle user hints
+#
+[AC_ARG_WITH(yajl,
+[
+  --with-yajl=DIR root directory path of yajl installation [defaults to
+                    /usr/local or /usr if not found in /usr/local]
+  --without-yajl to disable yajl usage completely],
+[
+if test "$withval" != "no"; then
+       if test -d "$withval" ; then
+               WANT_YAJL="yes"
+               yajl_places="$withval"
+       else
+               AC_MSG_WARN([Sorry, $withval does not exist])
+       fi
+fi
+],[
+dnl just provide default places where it most probably could be found
+yajl_places="/usr/local /usr /opt/local /sw"
+])
+
+#
+# Locate yajl
+#
+
+if test -n "$yajl_places" ; then
+       # check the user supplied or any other more or less 'standard' place:
+       for YAJL_HOME in ${yajl_places} ; do
+         if test -f "${YAJL_HOME}/include/yajl/yajl_parse.h"; then break; fi
+         YAJL_HOME=""
+       done
+
+       # if yajl.h was nowhere to be found, give a notice and bail out
+       if test ! -n "${YAJL_HOME}"; then
+          AC_MSG_ERROR(No yajl.h in any include directory of ${yajl_places}: either specify a valid yajl installation with --with-yajl=DIR or disable yajl usage with --without-yajl)
+       fi
+
+        AC_LANG_SAVE
+        AC_LANG_C
+        AC_CHECK_LIB(yajl, yajl_parse, [yajl_cv_libyajl=yes], [yajl_cv_libyajl=no])
+        AC_CHECK_HEADER(yajl/yajl_parse.h, [yajl_cv_yajl_parse_h=yes], [yajl_cv_yajl_parse_h=no])
+        AC_LANG_RESTORE
+       YAJL_LIBS="-lyajl"
+       YAJL_CFLAGS="-I${YAJL_HOME}/include"
+        if test "$yajl_cv_libyajl" != "yes" -a "$yajl_cv_yajl_parse_h" != "yes"
+        then
+                # If either header or library was not found, revert and bomb
+                AC_MSG_ERROR(either specify a valid yajl installation with --with-yajl=DIR or disable yajl usage with --without-yajl)
+        fi
+fi
+AC_SUBST(YAJL_LIBS)
+AC_SUBST(YAJL_CFLAGS)
+AC_SUBST(YAJL_LDFLAGS) dnl no really use for this library
+])