From cb97e26158c6b894a95ccf03fbd82eca77f185cc Mon Sep 17 00:00:00 2001
From: Ryan Burns <rtburns@protonmail.com>
Date: Thu, 4 Jan 2024 17:29:18 -0800
Subject: [PATCH] libunwind: populate bad platforms

Musl targets need platform-specific asm for getcontext/setcontext
implementations, so only certain musl platforms are supported.
---
 pkgs/development/libraries/libunwind/default.nix | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/libraries/libunwind/default.nix b/pkgs/development/libraries/libunwind/default.nix
index 0c8f4f70fe27..879f6f449b3c 100644
--- a/pkgs/development/libraries/libunwind/default.nix
+++ b/pkgs/development/libraries/libunwind/default.nix
@@ -50,7 +50,19 @@ stdenv.mkDerivation rec {
     description = "A portable and efficient API to determine the call-chain of a program";
     maintainers = with maintainers; [ orivej ];
     # https://github.com/libunwind/libunwind#libunwind
-    platforms = [ "aarch64-linux" "armv5tel-linux" "armv6l-linux" "armv7a-linux" "armv7l-linux" "i686-freebsd13" "i686-linux" "mips64el-linux" "mipsel-linux" "powerpc64-linux" "powerpc64le-linux" "riscv64-linux" "x86_64-freebsd13" "x86_64-linux" "x86_64-solaris" ];
+    platforms = [ "aarch64-linux" "armv5tel-linux" "armv6l-linux" "armv7a-linux" "armv7l-linux" "i686-freebsd13" "i686-linux" "mips64el-linux" "mipsel-linux" "powerpc64-linux" "powerpc64le-linux" "riscv64-linux" "s390x-linux" "x86_64-freebsd13" "x86_64-linux" "x86_64-solaris" ];
+    # libunwind relies on getcontext/setcontext,
+    # and only has a musl implementation for some platforms
+    # https://github.com/libunwind/libunwind/issues/33
+    # https://github.com/libunwind/libunwind/issues/69
+    badPlatforms = [ {
+      isAarch64 = false;
+      isRiscV64 = false;
+      isS390x = false;
+      isx86_64 = false;
+      isMusl = true;
+      parsed = {};
+    } ];
     license = licenses.mit;
   };
 }