Compile with -Wall -Werror - this could have saved us from some bugs...

src/Makefile.am

-AM_CFLAGS = $(VARNISHAPI_CFLAGS)
+DEV_CFLAGS = -Wall -Werror
+AM_CFLAGS = $(VARNISHAPI_CFLAGS) $(DEV_CFLAGS)
+
 
 # ----------------------------------------
 # get header from ext vmod

src/flint.lnt

@@ -17,6 +17,7 @@
 -esym(765, tus_files_VSPLAY_*)
 -esym(768, Vmod_vmod_*_Func::*)
 -efile(766, *_if.c)
+-esym(528, avoid_compiler_warnings)
 -esym(528, vmod_priv_blob*, VGC_*)
 -esym(843, vmod_priv_blob*, VGC_*)
 -esym(844, vmod_priv_blob*, VGC_*)

src/tus_blob.c

@@ -42,6 +42,15 @@
 #include "tus_blob.h"
 #include "tus_checksums.h"
 
+//avoid defined but not used
+static inline void
+avoid_compiler_warnings(void) {
+	(void)vmod_priv_blobdigest;
+	(void)VGC_vmod_blobdigest;
+	(void)vmod_priv_blob;
+	(void)VGC_vmod_blob;
+}
+
 static const struct Vmod_vmod_blob_Func *vmod_blob = NULL;
 static const struct Vmod_vmod_blobdigest_Func *vmod_blobdigest = NULL;
 static void *dl_vmod_blob = NULL;