Support file-scope functions

chibicc.h

@@ -201,6 +201,7 @@ struct Function {
   Function *next;
   char *name;
   VarList *params;
+  bool is_static;
 
   Node *node;
   VarList *locals;

codegen.c

@@ -574,6 +574,7 @@ void emit_text(Program *prog) {
   printf(".text\n");
 
   for (Function *fn = prog->fns; fn; fn = fn->next) {
+    if (!fn->is_static)
       printf(".global %s\n", fn->name);
     printf("%s:\n", fn->name);
     funcname = fn->name;

parse.c

@@ -575,6 +575,7 @@ Function *function() {
   // Construct a function object
   Function *fn = calloc(1, sizeof(Function));
   fn->name = name;
+  fn->is_static = ty->is_static;
   expect("(");
   fn->params = read_func_params();
 

tests

@@ -96,6 +96,8 @@ int param_decay(int x[]) { return x[0]; }
 
 void voidfn(void) {}
 
+static int static_fn(void) {}
+
 int main() {
   assert(8, ({ int a=3; int z=5; a+z; }), "int a=3; int z=5; a+z;");