From 9d4a6d67aa3b85c64e0b2367d8ab30ae72f64834 Mon Sep 17 00:00:00 2001
From: Sebastian Ullrich <sebasti@nullri.ch>
Date: Mon, 30 Aug 2021 17:38:25 +0200
Subject: [PATCH] libunwind: fix unwinding through libunwind stack frames

Fixes #9591
---
 src/libunwind.zig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/libunwind.zig b/src/libunwind.zig
index 0d70854213..192f9ac2d2 100644
--- a/src/libunwind.zig
+++ b/src/libunwind.zig
@@ -71,6 +71,8 @@ pub fn buildStaticLib(comp: *Compilation) !void {
         try cflags.append("-Wa,--noexecstack");
         try cflags.append("-fvisibility=hidden");
         try cflags.append("-fvisibility-inlines-hidden");
+        // necessary so that libunwind can unwind through its own stack frames
+        try cflags.append("-funwind-tables");
 
         // This is intentionally always defined because the macro definition means, should it only
         // build for the target specified by compiler defines. Since we pass -target the compiler