From 39331eb95234e43f55d1caebb99f3a4ca65ce15d Mon Sep 17 00:00:00 2001
From: tyfkda <tyfkda@gmail.com>
Date: Mon, 16 Dec 2024 06:34:18 +0900
Subject: [PATCH] Allow empty bracket for primitive initializer

C2X
---
 src/cc/frontend/initializer.c | 11 +++++++++++
 tests/valtest.c               |  3 +++
 2 files changed, 14 insertions(+)

diff --git a/src/cc/frontend/initializer.c b/src/cc/frontend/initializer.c
index ba64fc9b4..ebef2c189 100644
--- a/src/cc/frontend/initializer.c
+++ b/src/cc/frontend/initializer.c
@@ -516,6 +516,17 @@ Initializer *flatten_initializer(Type *type, Initializer *init) {
   } else {
     switch (init->kind) {
     case IK_MULTI:
+      if (init->multi->len == 0) {
+        init->kind = IK_SINGLE;
+#ifndef __NO_FLONUM
+        if (is_flonum(type)) {
+          init->single = new_expr_flolit(type, init->token, 0);
+          break;
+        }
+#endif
+        init->single = new_expr_fixlit(type, init->token, 0);
+        break;
+      }
       if (init->multi->len != 1 || ((Initializer*)init->multi->data[0])->kind != IK_SINGLE) {
         parse_error(PE_NOFATAL, init->token, "Requires scaler");
         break;
diff --git a/tests/valtest.c b/tests/valtest.c
index 540fb13b7..2c0030240 100644
--- a/tests/valtest.c
+++ b/tests/valtest.c
@@ -714,6 +714,9 @@ TEST(all) {
   {
     char buf[3] = {};
     EXPECT("char array with empty initializer", 0, buf[0]);
+
+    int z = {};
+    EXPECT("primitive with empty initializer", 0, z);
   }
   {
     struct {int x; int y;} s = {3};