Added a few missing copts, and made some functions proper prototypes.

examples/bazel/BUILD

@@ -17,4 +17,5 @@ cc_binary(
     name = "test_binary",
     srcs = ["test_binary.c"],
     deps = [":foo_upbproto"],
+    copts = ["-std=c99"],
 )

tests/BUILD

@@ -50,6 +50,7 @@ upb_proto_library(
 cc_test(
     name = "test_generated_code",
     srcs = ["test_generated_code.c"],
+    copts = UPB_DEFAULT_COPTS,
     deps = [
         ":empty_upbdefs_proto",
         ":test_messages_proto3_proto_upb",

tests/bindings/lua/BUILD

@@ -2,6 +2,10 @@ load(
     "//upb/bindings/lua:lua_proto_library.bzl",
     "lua_proto_library",
 )
+load(
+    "//bazel:build_defs.bzl",
+    "UPB_DEFAULT_COPTS",
+)
 
 licenses(["notice"])
 
@@ -20,6 +24,7 @@ cc_test(
         "@com_google_protobuf//:conformance_proto",
         "@com_google_protobuf//:descriptor_proto",
     ],
+    copts = UPB_DEFAULT_COPTS,
     linkstatic = 1,
     deps = [
         "//upb/bindings/lua:lupb",

tests/bindings/lua/main.c

@@ -34,7 +34,7 @@ const char *init =
     "upb/bindings/lua/?.lua"
   "'";
 
-int main() {
+int main(int argc, char **argv) {
   int ret = 0;
   L = luaL_newstate();
   luaL_openlibs(L);

tests/test_generated_code.c

@@ -24,7 +24,7 @@ const int32_t test_int32_2 = -20;
 const int32_t test_int32_3 = 30;
 const int32_t test_int32_4 = -40;
 
-static void test_scalars() {
+static void test_scalars(void) {
   upb_arena *arena = upb_arena_new();
   protobuf_test_messages_proto3_TestAllTypesProto3 *msg =
       protobuf_test_messages_proto3_TestAllTypesProto3_new(arena);
@@ -117,7 +117,7 @@ static void check_string_map_one_entry(
   ASSERT(!const_ent);
 }
 
-static void test_string_double_map() {
+static void test_string_double_map(void) {
   upb_arena *arena = upb_arena_new();
   upb_strview serialized;
   upb_test_MapTest *msg = upb_test_MapTest_new(arena);
@@ -141,7 +141,7 @@ static void test_string_double_map() {
   upb_arena_free(arena);
 }
 
-static void test_string_map() {
+static void test_string_map(void) {
   upb_arena *arena = upb_arena_new();
   protobuf_test_messages_proto3_TestAllTypesProto3 *msg =
       protobuf_test_messages_proto3_TestAllTypesProto3_new(arena);
@@ -259,7 +259,7 @@ static void check_int32_map_one_entry(
   ASSERT(!const_ent);
 }
 
-static void test_int32_map() {
+static void test_int32_map(void) {
   upb_arena *arena = upb_arena_new();
   protobuf_test_messages_proto3_TestAllTypesProto3 *msg =
       protobuf_test_messages_proto3_TestAllTypesProto3_new(arena);
@@ -328,7 +328,7 @@ static void test_int32_map() {
   upb_arena_free(arena);
 }
 
-void test_repeated() {
+void test_repeated(void) {
   upb_arena *arena = upb_arena_new();
   protobuf_test_messages_proto3_TestAllTypesProto3 *msg =
       protobuf_test_messages_proto3_TestAllTypesProto3_new(arena);
@@ -347,7 +347,7 @@ void test_repeated() {
   upb_arena_free(arena);
 }
 
-void test_null_decode_buf() {
+void test_null_decode_buf(void) {
   upb_arena *arena = upb_arena_new();
   protobuf_test_messages_proto3_TestAllTypesProto3 *msg =
       protobuf_test_messages_proto3_TestAllTypesProto3_parse(NULL, 0, arena);
@@ -359,7 +359,7 @@ void test_null_decode_buf() {
   upb_arena_free(arena);
 }
 
-void test_status_truncation() {
+void test_status_truncation(void) {
   int i, j;
   upb_status status;
   upb_status status2;