harness: make sure g_assert() statements are always active

We have code with side effects inside g_assert()s, so make
sure those are always enabled here (they might otherwise
get disabled for release builds).

libs/gst/check/Makefile.am

@@ -13,6 +13,7 @@ libgstcheck_@GST_API_VERSION@_la_SOURCES =	\
 	gsttestclock.c
 
 libgstcheck_@GST_API_VERSION@_la_CFLAGS = $(GST_OBJ_CFLAGS) \
+	-UG_DISABLE_ASSERT \
 	-I$(top_builddir)/libs \
 	-I$(top_builddir)/libs/gst/check \
 	-I$(top_builddir)/libs/gst/check/libcheck

libs/gst/check/gstharness.c

@@ -124,6 +124,11 @@
 #include "config.h"
 #endif
 
+/* we have code with side effects in asserts, so make sure they are active */
+#ifdef G_DISABLE_ASSERT
+#error "GstHarness must be compiled with G_DISABLE_ASSERT undefined"
+#endif
+
 #include "gstharness.h"
 
 #include <stdio.h>