From 7b7ffc4999ba4b38f8090aab48a78ace0eb3424a Mon Sep 17 00:00:00 2001
From: Joe Hermaszewski <git@monoid.al>
Date: Wed, 26 Apr 2017 14:01:35 +0000
Subject: [PATCH] LLVM-3.9: disable shared libraries in cross builds

The current cc-wrapper script seems to have trouble setting the rpath
correctly. Hopefully #25047 will fix this.
---
 pkgs/development/compilers/llvm/3.9/llvm.nix | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/pkgs/development/compilers/llvm/3.9/llvm.nix b/pkgs/development/compilers/llvm/3.9/llvm.nix
index 380abc0b9b47..96efc97323c6 100644
--- a/pkgs/development/compilers/llvm/3.9/llvm.nix
+++ b/pkgs/development/compilers/llvm/3.9/llvm.nix
@@ -15,13 +15,15 @@
 , compiler-rt_src
 , libcxxabi
 , debugVersion ? false
-, enableSharedLibraries ? true
+, enableSharedLibraries ? (buildPlatform == hostPlatform)
 , darwin
 , buildPackages
 , buildPlatform
 , hostPlatform
 }:
 
+assert (hostPlatform != buildPlatform) -> !enableSharedLibraries;
+
 let
   src = fetch "llvm" "1vi9sf7rx1q04wj479rsvxayb6z740iaz3qniwp266fgp5a07n8z";
   shlib = if stdenv.isDarwin then "dylib" else "so";
@@ -84,12 +86,6 @@ in stdenv.mkDerivation rec {
   preBuild = ''
     mkdir -p $out/
     ln -sv $PWD/lib $out
-  ''
-  + # This is a good candidate for using the `placeholder` primitive when it's released
-    # This should hopefully be unnecessary once
-    # https://github.com/NixOS/nixpkgs/pull/25047 is merged
-    stdenv.lib.optionalString (buildPlatform != hostPlatform && enableSharedLibraries) ''
-    export NIX_CROSS_LDFLAGS="-rpath $lib/lib -rpath $lib/lib64 $NIX_CROSS_LDFLAGS"
   '';
 
   cmakeFlags = with stdenv; [