From f7b49ea2af1342ea3ff0d32e9048c17ac122bceb Mon Sep 17 00:00:00 2001
From: sternenseemann <0rpkxez4ksa01gb3typccl0i@systemli.org>
Date: Thu, 13 May 2021 18:57:03 +0200
Subject: [PATCH] llvmPackages_12.lld: make sure llvm libunwind is passed
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lld needs LLVM's libunwind for its headers. That libunwind is not part
of the tools scope in pkgs/development/compilers/llvm/12/default.nix,
which means that lld previously received libunwind from top-level pkgs
which of course doesn't have the required headers.

To resolve this pass libunwind from the libraries scope — platform
concerns don't really mattern as only libunwind.src is used.

libunwind was initially passed correctly, but that was removed in
e830db4320ac3b38c648d492b3d04c71a0860a54. This regression was likely
introduced accidentally.
---
 pkgs/development/compilers/llvm/12/default.nix | 1 +
 1 file changed, 1 insertion(+)

diff --git a/pkgs/development/compilers/llvm/12/default.nix b/pkgs/development/compilers/llvm/12/default.nix
index db43c5bd00bd..4b71a458eb73 100644
--- a/pkgs/development/compilers/llvm/12/default.nix
+++ b/pkgs/development/compilers/llvm/12/default.nix
@@ -96,6 +96,7 @@ let
 
     lld = callPackage ./lld {
       inherit llvm_meta;
+      inherit (libraries) libunwind;
     };
 
     lldb = callPackage ./lldb {