From 2505aa51a449e5237808b2b6dc6a90105da90caa Mon Sep 17 00:00:00 2001
From: Matthew Glazar <strager.nds@gmail.com>
Date: Sun, 15 Apr 2018 21:08:24 -0700
Subject: [PATCH] clang: fix install on Darwin

As of Nix 2.0, building the `user-environment` package on macOS (Darwin)
fails because LLVMgold.so is a broken symlink. Fix the issue by not
creating the symlink in the first place, since it wouldn't be used on
Darwin anyway.
---
 pkgs/development/compilers/llvm/5/clang/default.nix | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/compilers/llvm/5/clang/default.nix b/pkgs/development/compilers/llvm/5/clang/default.nix
index 8a25db3ef41..36f09a42308 100644
--- a/pkgs/development/compilers/llvm/5/clang/default.nix
+++ b/pkgs/development/compilers/llvm/5/clang/default.nix
@@ -52,7 +52,9 @@ let
 
     postInstall = ''
       # Clang expects to find LLVMgold in its own prefix
-      ln -sv ${llvm}/lib/LLVMgold.so $out/lib
+      if [ -e ${llvm}/lib/LLVMgold.so ]; then
+        ln -sv ${llvm}/lib/LLVMgold.so $out/lib
+      fi
       # Clang expects to find sanitizer libraries in its own prefix
       ln -sv ${llvm}/lib/clang/${release_version}/lib $out/lib/clang/${release_version}/
       ln -sv $out/bin/clang $out/bin/cpp