From d32e0e6b1b6c308c28f954685cf63cf176db02af Mon Sep 17 00:00:00 2001
From: Divam <dfordivam@gmail.com>
Date: Thu, 23 Sep 2021 09:17:31 +0900
Subject: [PATCH] llvmPackages_13.lld: add postPatch to fix Darwin build

---
 pkgs/development/compilers/llvm/13/lld/default.nix | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/pkgs/development/compilers/llvm/13/lld/default.nix b/pkgs/development/compilers/llvm/13/lld/default.nix
index 34ac265f4bfd..2b5e9e965d07 100644
--- a/pkgs/development/compilers/llvm/13/lld/default.nix
+++ b/pkgs/development/compilers/llvm/13/lld/default.nix
@@ -18,6 +18,14 @@ stdenv.mkDerivation rec {
     ./gnu-install-dirs.patch
   ];
 
+  # On Darwin the llvm-config is perhaps not working fine as the
+  # LLVM_MAIN_SRC_DIR is not getting set correctly, and the build fails as the
+  # include path is not correct.
+  postPatch = lib.optionalString stdenv.isDarwin ''
+    substituteInPlace MachO/CMakeLists.txt --replace \
+      '(''${LLVM_MAIN_SRC_DIR}/' '(../'
+  '';
+
   nativeBuildInputs = [ cmake ];
   buildInputs = [ libllvm libxml2 ];