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Handle extern in external symbols

--- a/cc1/decl.c

+++ b/cc1/decl.c

@@ -240,6 +240,7 @@

 	error("invalid type specification");

 }

+/* TODO: check storage class and correctness of the initializator  */

 static struct node *

 initializer(register Type *tp)

 {

@@ -443,13 +444,15 @@

 		do {

 			sym = declarator(base, ID_EXPECTED);

 			tp = sym->type;

-			if (!(sclass & STATIC))

+			sym->s.isstatic = 1;

+

+			if (sclass != STATIC)

 				sym->s.isglobal = 1;

+			else if (sclass != EXTERN)

+				sym->s.isdefined = 1;

+

 			if (BTYPE(tp) != FTN) {

-				sym->s.isstatic = 1;

-				if (sclass & EXTERN)

-					; /* TODO: handle extern */

-				else if (accept('='))

+				if (accept('='))

 					initializer(tp);

 				emitdcl(sym);

 			} else if (yytoken == '{') {