From 08c1a81b29f710c252dceda2d702b71d1f595cab Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alex=20R=C3=B8nne=20Petersen?= <alex@alexrp.com>
Date: Mon, 5 Oct 2026 03:23:56 +0200
Subject: [PATCH] cbe: apply zig_mangled() on extern variable forward decls

---
 src/codegen/c.zig | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/codegen/c.zig b/src/codegen/c.zig
index 4e58ede308fcaefe9b58ee073b3f1b21eaba8e76..c871f2d765bea5eac10790eebb9c4cff53276832 100644
--- a/src/codegen/c.zig
+++ b/src/codegen/c.zig
@@ -2552,6 +2552,13 @@ pub fn genDeclFwd(dg: *DeclGen, w: *Writer) Error!void {
                     .{ .@"const" = nav.resolved.?.@"const" },
                     nav.resolved.?.@"align",
                 );
+                const extern_name = nav.name.toSlice(ip);
+                const is_mangled = isMangledIdent(extern_name, true);
+                if (is_mangled) {
+                    try w.print(" zig_mangled({f}, {f})", .{
+                        fmtIdentSolo(extern_name), fmtStringLiteral(extern_name, null),
+                    });
+                }
                 try w.writeAll(";\n");
                 return;
             },
-- 
2.54.0