build: prepend --with-jim-ext=nvp to jimtcl configure

This allows us to add options to jimtcl configure.
The default autoconf AC_CONFIG_SUBDIRS does not currently support this.

Signed-off-by: Spencer Oliver <ntfreak@users.sourceforge.net>

config_subdir.m4

@@ -0,0 +1,27 @@
+dnl
+dnl If needed, define the m4_ifblank and m4_ifnblank macros from autoconf 2.64
+dnl This allows us to run with earlier Autoconfs as well.
+ifdef([m4_ifblank],[],[
+m4_define([m4_ifblank],
+[m4_if(m4_translit([[$1]],  [ ][	][
+]), [], [$2], [$3])])])
+dnl
+ifdef([m4_ifnblank],[],[
+m4_define([m4_ifnblank],
+[m4_if(m4_translit([[$1]],  [ ][	][
+]), [], [$3], [$2])])])
+dnl
+
+dnl AC_CONFIG_SUBDIRS does not allow configure options to be passed
+dnl to subdirs, this function allows that by creating a configure.gnu
+dnl script that prepends configure options and then calls the real
+dnl configure script
+AC_DEFUN([AX_CONFIG_SUBDIR_OPTION],
+[
+AC_CONFIG_SUBDIRS([$1])
+
+m4_ifblank([$2], [rm -f $srcdir/$1/configure.gnu],
+[printf "#!/bin/sh
+"\$"SHELL "../$srcdir/$1/configure" $2 "\$"@" > "$srcdir/$1/configure.gnu"
+])
+])

configure.in

@@ -4,6 +4,8 @@ AC_INIT([openocd], [0.5.0-dev],
 AC_CONFIG_SRCDIR([src/openocd.c])
 AC_CONFIG_AUX_DIR([.])
 
+m4_include(config_subdir.m4)dnl
+
 AM_INIT_AUTOMAKE([-Wall -Wno-portability dist-bzip2 dist-zip])
 AM_MAINTAINER_MODE
 
@@ -763,7 +765,7 @@ fi
 
 if test "$use_internal_jimtcl" = yes; then
   if test -f "$srcdir/jimtcl/configure.ac"; then
-    AC_CONFIG_SUBDIRS([jimtcl])
+    AX_CONFIG_SUBDIR_OPTION(jimtcl, --with-jim-ext=nvp)
   else
     AC_MSG_ERROR([jimtcl not found, run git submodule init and git submodule update.])
   fi