From 192f4171d8a9cb7f2e675b4b96f16770bcf2bd15 Mon Sep 17 00:00:00 2001
From: Jan Tojnar <jtojnar@gmail.com>
Date: Mon, 24 Dec 2018 15:38:52 +0100
Subject: [PATCH] llvm: allow passing arbitrary targets

Mesa requires AMDGPU target but previously, we only allowed a pre-defined set
of targets.
---
 pkgs/development/compilers/llvm/common.nix | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/compilers/llvm/common.nix b/pkgs/development/compilers/llvm/common.nix
index e4f55963a6f..27f48ff3f11 100644
--- a/pkgs/development/compilers/llvm/common.nix
+++ b/pkgs/development/compilers/llvm/common.nix
@@ -2,7 +2,9 @@
 
 rec {
   llvmBackend = platform:
-    if platform.parsed.cpu.family == "x86" then
+    if builtins.typeOf platform == "string" then
+      platform
+    else if platform.parsed.cpu.family == "x86" then
       "X86"
     else if platform.parsed.cpu.name == "aarch64" then
       "AArch64"