scc

commit b4d7213017daf1c0b5f7732df3f9d02b45ee2037
parent 5679ed45adb286c3e17e5db68d5b4a2a64b23fcf
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Fri,  5 Nov 2021 06:38:46 +0100

cc2/qbe: Use common symbols for tentative declarations

Common symbols allow multiple tentative definitions in
different symbols, which is a common extension of the C
language, specially in UNIX where C was born.

Diffstat:
M
src/cmd/cc/cc2/target/qbe/code.c
 | 
11
+++++++----

1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/src/cmd/cc/cc2/target/qbe/code.c b/src/cmd/cc/cc2/target/qbe/code.c
@@ -287,10 +287,13 @@ defglobal(Symbol *sym)
 		return;
 	if (sym->kind == SGLOB)
 		fputs("export ", stdout);
-	printf("data %s = align %d {\n", symname(sym), tp->align);
-	if (sym->type.flags & INITF)
-		return;
-	printf("\tz\t%lu\n}\n", tp->size);
+
+	printf("data %s = %s align %d {\n",
+	       symname(sym),
+	       (tp->flags & INITF) ? "" : "common",
+	       tp->align);
+	if ((tp->flags & INITF) == 0)
+		printf("\tz\t%lu\n}\n", tp->size);
 }
 
 void