From 8fbae77770a77ccd645054e06baab45b03c8befd Mon Sep 17 00:00:00 2001
From: LemonBoy <thatlemon@gmail.com>
Date: Sat, 7 Sep 2019 11:17:12 +0200
Subject: Force LLVM to generate byte-aligned packed unions

Sometimes the frontend and LLVM would disagree on the ABI alignment of a
packed union. Solve the problem by telling LLVM we're gonna manage the
struct layout by ourselves.

Closes #3184
---
 test/stage1/behavior/union.zig | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'test')

diff --git a/test/stage1/behavior/union.zig b/test/stage1/behavior/union.zig
index 7c5c653275..21308b0ea2 100644
--- a/test/stage1/behavior/union.zig
+++ b/test/stage1/behavior/union.zig
@@ -482,3 +482,15 @@ test "comparison between union and enum literal" {
     testComparison();
     comptime testComparison();
 }
+
+test "packed union generates correctly aligned LLVM type" {
+    const U = packed union {
+        f1: fn () void,
+        f2: u32,
+    };
+    var foo = [_]U{
+        U{ .f1 = doTest },
+        U{ .f2 = 0 },
+    };
+    foo[0].f1();
+}
-- 
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