Fix #1481 - use stricter compilation flags

Makefile

@@ -1,7 +1,7 @@
 SRCS = mongoose.c test/unit_test.c test/packed_fs.c
 HDRS = $(wildcard src/*.h)
 DEFS ?= -DMG_MAX_HTTP_HEADERS=7 -DMG_ENABLE_LINES -DMG_ENABLE_PACKED_FS=1
-WARN ?= -W -Wall -Werror -Wshadow -Wdouble-promotion -fno-common -Wconversion -Wundef
+WARN ?= -W -Wall -Werror -Wshadow -Wdouble-promotion -Wmissing-prototypes -Wstrict-prototypes -fno-common -Wconversion -Wundef
 OPTS ?= -O3 -g3
 INCS ?= -Isrc -I.
 SSL ?= MBEDTLS
@@ -62,7 +62,7 @@ unpacked:
 	$(CC) -I. mongoose.c test/unit_test.c -o unit_test
 
 fuzzer: mongoose.c mongoose.h Makefile test/fuzz.c
-	clang mongoose.c test/fuzz.c $(WARN) $(INCS) -DMG_ENABLE_LINES -DMG_ENABLE_LOG=0 -fsanitize=fuzzer,signed-integer-overflow,address -g -o $@
+	clang++ mongoose.c test/fuzz.c $(WARN) $(INCS) $(TFLAGS) $(EXTRA) -DMG_ENABLE_LINES -DMG_ENABLE_LOG=0 -fsanitize=fuzzer,signed-integer-overflow,address -Wno-deprecated -o $@
 
 fuzz: fuzzer
 	$(RUN) ./fuzzer

mongoose.c

@@ -632,6 +632,7 @@ struct packed_file {
 
 const char *mg_unpack(const char *path, size_t *size, time_t *mtime);
 const char *mg_unlist(size_t no);
+
 #if MG_ENABLE_PACKED_FS
 #else
 const char *mg_unpack(const char *path, size_t *size, time_t *mtime) {

mongoose.h

@@ -562,6 +562,7 @@ size_t mg_asprintf(char **, size_t, const char *fmt, ...) PRINTF_LIKE(3, 4);
 size_t mg_vasprintf(char **buf, size_t size, const char *fmt, va_list ap);
 int mg_check_ip_acl(struct mg_str acl, uint32_t remote_ip);
 int64_t mg_to64(struct mg_str str);
+size_t mg_lld(char *buf, int64_t val, bool is_signed, bool is_hex);
 
 
 
@@ -1141,7 +1142,6 @@ void mg_resolve_cancel(struct mg_connection *);
 bool mg_dns_parse(const uint8_t *buf, size_t len, struct mg_dns_message *);
 size_t mg_dns_parse_rr(const uint8_t *buf, size_t len, size_t ofs,
                        bool is_question, struct mg_dns_rr *);
-size_t mg_dns_decode_name(const uint8_t *, size_t, size_t, char *, size_t);
 
 #ifdef __cplusplus
 }

src/dns.h

@@ -36,4 +36,3 @@ void mg_resolve_cancel(struct mg_connection *);
 bool mg_dns_parse(const uint8_t *buf, size_t len, struct mg_dns_message *);
 size_t mg_dns_parse_rr(const uint8_t *buf, size_t len, size_t ofs,
                        bool is_question, struct mg_dns_rr *);
-size_t mg_dns_decode_name(const uint8_t *, size_t, size_t, char *, size_t);

src/fs_packed.c

@@ -9,6 +9,7 @@ struct packed_file {
 
 const char *mg_unpack(const char *path, size_t *size, time_t *mtime);
 const char *mg_unlist(size_t no);
+
 #if MG_ENABLE_PACKED_FS
 #else
 const char *mg_unpack(const char *path, size_t *size, time_t *mtime) {

src/str.h

@@ -41,3 +41,4 @@ size_t mg_asprintf(char **, size_t, const char *fmt, ...) PRINTF_LIKE(3, 4);
 size_t mg_vasprintf(char **buf, size_t size, const char *fmt, va_list ap);
 int mg_check_ip_acl(struct mg_str acl, uint32_t remote_ip);
 int64_t mg_to64(struct mg_str str);
+size_t mg_lld(char *buf, int64_t val, bool is_signed, bool is_hex);

test/mongoose_custom.c

@@ -33,5 +33,6 @@ struct mg_connection *mg_mkpipe(struct mg_mgr *mgr, mg_event_handler_t fn,
   return NULL;
 }
 
+void _fini(void);
 void _fini(void) {
 }

test/pack.c

@@ -25,6 +25,8 @@
 #include <sys/stat.h>
 
 static const char *code =
+    "const char *mg_unpack(const char *path, size_t *size, time_t *mtime);\n"
+    "const char *mg_unlist(size_t no);\n"
     "const char *mg_unlist(size_t no) {\n"
     "  return packed_files[no].name;\n"
     "}\n"