config: fix Autoconf warnings and improve comments

These changes have been done in all other video drivers.

Signed-off-by: Gaetan Nadon <memsize@videotron.ca>

configure.ac

@@ -20,6 +20,7 @@
 #
 # Process this file with autoconf to produce a configure script
 
+# Initialize Autoconf
 AC_PREREQ(2.59)
 AC_INIT([xf86-video-geode],
         [2.11.12],
@@ -28,34 +29,43 @@ AC_INIT([xf86-video-geode],
 	[http://www.x.org/wiki/GeodeDriver])
 
 AC_CONFIG_SRCDIR([Makefile.am])
-AM_CONFIG_HEADER([config.h])
+AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_AUX_DIR(.)
 
+# Initialize Automake
+AM_INIT_AUTOMAKE([foreign dist-bzip2])
+AM_MAINTAINER_MODE
+
+# Initialize libtool
+AC_DISABLE_STATIC
+AC_PROG_LIBTOOL
+
 # Require xorg-macros: XORG_DEFAULT_OPTIONS
 m4_ifndef([XORG_MACROS_VERSION], 
           [m4_fatal([must install xorg-macros 1.4 or later before running autoconf/autogen])])
 XORG_MACROS_VERSION(1.4)
 XORG_DEFAULT_OPTIONS
 
-AM_INIT_AUTOMAKE([foreign dist-bzip2])
-
-AM_MAINTAINER_MODE
-
 # Checks for programs.
 AC_DISABLE_STATIC
 AC_PROG_LIBTOOL
 
 AH_TOP([#include "xorg-server.h"])
 
+# -----------------------------------------------------------------------------
+#			Configuration options
+# -----------------------------------------------------------------------------
+# Define a configure option for an alternate input module directory
 AC_ARG_WITH(xorg-module-dir,
-            AC_HELP_STRING([--with-xorg-module-dir=DIR],
+            AS_HELP_STRING([--with-xorg-module-dir=DIR],
                            [Default xorg module directory [[default=$libdir/xorg/modules]]]),
             [moduledir="$withval"],
             [moduledir="$libdir/xorg/modules"])
 AC_SUBST([moduledir])
 
+# Define a configure option to enable/disable lcd panel support
 AC_ARG_ENABLE(geodegx-panel, 
-	      AC_HELP_STRING([--disable-geodegx-panel],
+	      AS_HELP_STRING([--disable-geodegx-panel],
 	      	             [Disable support for flatpanels with the Geode GX]),
 	      [ ], 
 	      [ PANEL_CPPFLAGS=-DPNL_SUP ])
@@ -106,19 +116,19 @@ main ()
 esac
 AC_SUBST([M32_CFLAGS])
 
-# Checks for extensions
+# Store the list of server defined optional extensions in REQUIRED_MODULES
 XORG_DRIVER_CHECK_EXT(RANDR, randrproto)
 XORG_DRIVER_CHECK_EXT(RENDER, renderproto)
 XORG_DRIVER_CHECK_EXT(XV, videoproto)
 XORG_DRIVER_CHECK_EXT(DPMSExtension, xextproto)
 
-# Checks for pkg-config packages
+# Obtain compiler/linker options for the Geode driver dependencies
 PKG_CHECK_MODULES(XORG, [xorg-server xproto fontsproto $REQUIRED_MODULES])
 PKG_CHECK_MODULES(XEXT, [xextproto >= 7.0.99.1],
                   HAVE_XEXTPROTO_71="yes"; AC_DEFINE(HAVE_XEXTPROTO_71, 1, [xextproto 7.1 available]),
                   HAVE_XEXTPROTO_71="no")
 
-# Checks for libraries.
+# Checks for libpciaccess support.
 SAVE_CPPFLAGS="$CPPFLAGS"
 CPPFLAGS="$CPPFLAGS $XORG_CFLAGS"
 AC_CHECK_DECL(XSERVER_LIBPCIACCESS,
@@ -131,7 +141,8 @@ if test "x$XSERVER_LIBPCIACCESS" = xyes; then
     XORG_CFLAGS="$XORG_CFLAGS $PCIACCESS_CFLAGS"
 fi
 
-AC_OUTPUT([
+AC_CONFIG_FILES([
 	Makefile
 	src/Makefile
 ])
+AC_OUTPUT