Use zero variadic macro concatenation

GCCのエラーを消す必要がある：

```sh
src/wcc/wcc.c:767:26: error: passing no argument for the '...' parameter of a variadic
      macro is a C23 extension [-Werror,-Wvariadic-macro-arguments-omitted]
  767 |   VERBOSE("### Exports\n");
      |                          ^
```

Author: tyfkda

Makefile

@@ -35,7 +35,7 @@ CC1_BE_DIR:=$(CC1_DIR)/backend
 
 OPTIMIZE:=-O2 -g3
 CFLAGS:=-ansi -std=c11 -pedantic -MMD -Wall -Wextra -Werror -Wold-style-definition \
-	-Wno-missing-field-initializers -Wno-empty-body \
+	-Wno-missing-field-initializers -Wno-empty-body -Wno-variadic-macro-arguments-omitted \
 	-D_DEFAULT_SOURCE $(OPTIMIZE) -I$(UTIL_DIR)
 ifneq ("$(NO_FLONUM)","")
 CFLAGS+=-D__NO_FLONUM

src/wcc/emit_wasm.c

@@ -445,7 +445,7 @@ static void emit_elems_section(EmitWasm *ew) {
   data_open_chunk(&elems_section);
 
   // Enumerate imported functions.
-  VERBOSES("### Indirect functions\n");
+  VERBOSE("### Indirect functions\n");
   data_leb128(&elems_section, -1, 1);  // num elem segments
   data_leb128(&elems_section, -1, 0);  // segment flags
   data_push(&elems_section, OP_I32_CONST);
@@ -460,7 +460,7 @@ static void emit_elems_section(EmitWasm *ew) {
     data_leb128(&elems_section, -1, finfo->index);  // elem function index
   }
   data_close_chunk(&elems_section, -1);
-  VERBOSES("\n");
+  VERBOSE("\n");
 
   fputc(SEC_ELEM, ew->ofp);
   fwrite(elems_section.buf, elems_section.len, 1, ew->ofp);
@@ -526,7 +526,7 @@ static Vector *emit_data_section(EmitWasm *ew) {
   if (segments->len > 0) {
     reloc_data = new_vector();
 
-    VERBOSES("### Data\n");
+    VERBOSE("### Data\n");
     DataStorage datasec;
     data_init(&datasec);
     data_open_chunk(&datasec);
@@ -558,7 +558,7 @@ static Vector *emit_data_section(EmitWasm *ew) {
       }
     }
     data_close_chunk(&datasec, -1);
-    VERBOSES("\n");
+    VERBOSE("\n");
 
     fputc(SEC_DATA, ew->ofp);
     fwrite(datasec.buf, datasec.len, 1, ew->ofp);

src/wcc/traverse.c

@@ -1042,7 +1042,7 @@ static inline void assign_symbol_index(void) {
 
 static inline void assign_function_index(void) {
   // Enumerate functions.
-  VERBOSES("### Functions\n");
+  VERBOSE("### Functions\n");
   const Name *name;
   FuncInfo *finfo;
   int32_t index = 0;
@@ -1057,7 +1057,7 @@ static inline void assign_function_index(void) {
       VERBOSE("%2d: %.*s%s\n", finfo->index, NAMES(name), k == 0 ? "  (import)" : "");
     }
   }
-  VERBOSES("\n");
+  VERBOSE("\n");
 }
 
 static inline void assign_data_address(void) {

src/wcc/wcc.c

@@ -764,12 +764,12 @@ int main(int argc, char *argv[]) {
     add_inc_path(INC_AFTER, JOIN_PATHS(root, "include"));
   }
 
-  VERBOSES("### Exports\n");
+  VERBOSE("### Exports\n");
   const Name *name;
   for (int it = 0; (it = table_iterate(opts.exports, it, &name, NULL)) != -1; ) {
     VERBOSE("%.*s\n", NAMES(name));
   }
-  VERBOSES("\n");
+  VERBOSE("\n");
 
   if (opts.out_type >= OutExecutable) {
     vec_push(opts.lib_paths, JOIN_PATHS(root, "lib"));

src/wcc/wcc.h

@@ -199,8 +199,7 @@ extern Vector *tables;  // <TableInfo*>
 extern Vector *init_funcs;  // <Function*>
 extern int compile_unit_flag;
 
-#define VERBOSES(str)  do { if (verbose) printf("%s", str); } while (0)
-#define VERBOSE(fmt, ...)  do { if (verbose) printf(fmt, __VA_ARGS__); } while (0)
+#define VERBOSE(fmt, ...)  do { if (verbose) printf(fmt __VA_OPT__(,) __VA_ARGS__); } while (0)
 
 uint32_t get_indirect_function_index(const Name *name);
 GVarInfo *register_gvar_info(const Name *name, VarInfo *varinfo);