stage2: implement var args

1 files changed, 7 insertions, 2 deletions

diff --git a/src/codegen/c.zig b/src/codegen/c.zig
index a885b984ac..1a323441d9 100644
--- a/src/codegen/c.zig
+++ b/src/codegen/c.zig
@@ -215,8 +215,9 @@ pub const DeclGen = struct {
         try dg.renderType(w, tv.ty.fnReturnType());
         const decl_name = mem.span(dg.decl.name);
         try w.print(" {s}(", .{decl_name});
-        var param_len = tv.ty.fnParamLen();
-        if (param_len == 0)
+        const param_len = tv.ty.fnParamLen();
+        const is_var_args = tv.ty.fnIsVarArgs();
+        if (param_len == 0 and !is_var_args)
             try w.writeAll("void")
         else {
             var index: usize = 0;
@@ -228,6 +229,10 @@ pub const DeclGen = struct {
                 try w.print(" a{d}", .{index});
             }
         }
+        if (is_var_args) {
+            if (param_len != 0) try w.writeAll(", ");
+            try w.writeAll("...");
+        }
         try w.writeByte(')');
     }