scc

commit 8c478f26e5b418f2ac6039c25ab3ac67554f5e63
parent 81ce26fac7e8ea5221092d6bf21c8495b38e1090
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Wed,  1 Jan 2025 21:44:54 +0100

cc1: Accept extern addresses as constants

Only local variables have non constant addresses, and we were
only the following cases:

	- SGLOBAL: Global symbol defined in this translation unit
	- SLOCAL: Local symbol to some function
	- SPRIVATE: Private symbol defined in this translation unit

but we were forgetting extern symbols defined in some other
translation unit.

Diffstat:
M
src/cmd/scc-cc/cc1/expr.c
 | 
4
+++-

1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/src/cmd/scc-cc/cc1/expr.c b/src/cmd/scc-cc/cc1/expr.c
@@ -218,7 +218,9 @@ chklvalue(Node *np)
 static Node *
 chkconstaddr(Node *var, Node *addr)
 {
-	if (var->sym && var->sym->flags & (SGLOBAL|SLOCAL|SPRIVATE)
+	unsigned mask = SGLOBAL|SLOCAL|SPRIVATE|SEXTERN;
+
+	if (var->sym && var->sym->flags & mask
 	|| var->op == OFIELD && var->left->op == OSYM
 	|| var->op == OFIELD && (var->left->flags & NCONST)) {
 		addr->flags |= NCONST;