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Set isdefined bit in local declarations

All the local definitions are definitions, excepts if they are
labelled as extern.

--- a/cc1/decl.c

+++ b/cc1/decl.c

@@ -400,21 +400,24 @@

 	int8_t sclass;

 	tp = specifier(&sclass);

-	if (yytoken != ';') {

-		do {

-			sym = declarator(tp, ID_EXPECTED);

-			switch (sclass) {

-			case REGISTER: sym->s.isregister = 1; break;

-			case STATIC: sym->s.isstatic = 1; break;

-			case EXTERN: /* TODO: */; break;

-			case TYPEDEF: /* TODO: */;break;

-			case AUTO: default: sym->s.isauto = 1;

-			}

-			if (accept('='))

-				initializer(sym);

-			emitdcl(sym);

-		} while (accept(','));

-	}

+	if (accept(';'))

+		return;

+

+	do {

+		sym = declarator(tp, ID_EXPECTED);

+		sym->s.isdefined = 1;

+		switch (sclass) {

+		case REGISTER: sym->s.isregister = 1; break;

+		case STATIC: sym->s.isstatic = 1; break;

+		case EXTERN: sym->s.isdefined = 0; break;

+		case TYPEDEF: /* TODO: */;break;

+		case AUTO: default: sym->s.isauto = 1;

+		}

+		if (accept('='))

+			initializer(sym);

+		emitdcl(sym);

+	} while (accept(','));

+

 	expect(';');

 }