From 218f9ff34e94511489d42f41831bc249464ed853 Mon Sep 17 00:00:00 2001
From: Benjamin Feng <contact@fengb.me>
Date: Tue, 19 Nov 2019 20:55:55 -0600
Subject: Work around WASI's nonexistent @returnAddress()

---
 lib/std/debug.zig | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'lib/std/debug.zig')

diff --git a/lib/std/debug.zig b/lib/std/debug.zig
index 3cf4306ea5..86d6522247 100644
--- a/lib/std/debug.zig
+++ b/lib/std/debug.zig
@@ -213,7 +213,8 @@ pub fn assert(ok: bool) void {
 
 pub fn panic(comptime format: []const u8, args: ...) noreturn {
     @setCold(true);
-    const first_trace_addr = @returnAddress();
+    // TODO: remove conditional once wasi / LLVM defines __builtin_return_address
+    const first_trace_addr = if (builtin.os == .wasi) null else @returnAddress();
     panicExtra(null, first_trace_addr, format, args);
 }
 
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