Add --enable-debug flag to configure

Defaults to enabled.

configure.ac

@@ -70,6 +70,14 @@ AC_ARG_ENABLE(video-debug, AC_HELP_STRING([--enable-video-debug],
               [VIDEO_DEBUG="$enableval"],
               [VIDEO_DEBUG=no])
 
+AC_ARG_ENABLE(debug, AC_HELP_STRING([--enable-debug],
+				    [Compile with debug support [[default=yes]]]))
+if test "x$enableval" == "xyes" ; then
+	DEBUGFLAGS="-g"
+else
+	DEBUGFLAGS=""
+fi
+
 dnl AC_ARG_ENABLE(xvmc, AC_HELP_STRING([--disable-xvmc],
 dnl                                   [Disable XvMC support [[default=auto]]]),
 dnl               [XVMC="$enableval"],
@@ -116,7 +124,7 @@ if test x$DRI = xauto; then
         fi
 fi
 AC_MSG_RESULT([$DRI])
-CFLAGS="$save_CFLAGS"
+CFLAGS="$save_CFLAGS $DEBUGFLAGS"
 
 PKG_CHECK_MODULES([PCIACCESS], [pciaccess >= 0.10])