From f0cee6b14f19dfe88aa502d123e11c0ba117b439 Mon Sep 17 00:00:00 2001
From: Matthew Bauer <mjbauer95@gmail.com>
Date: Sat, 3 Nov 2018 14:03:34 -0500
Subject: [PATCH] grpc: only set -Wno-error on clang

Apparently GCC errors on this:

https://hydra.nixos.org/build/83561519/
---
 pkgs/development/libraries/grpc/default.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/development/libraries/grpc/default.nix b/pkgs/development/libraries/grpc/default.nix
index e568ea9eb650..f4145c85199b 100644
--- a/pkgs/development/libraries/grpc/default.nix
+++ b/pkgs/development/libraries/grpc/default.nix
@@ -26,7 +26,7 @@ stdenv.mkDerivation rec {
     rm -vf BUILD
   '';
 
-  NIX_CFLAGS_COMPILE = "-Wno-error=unknown-warning-option";
+  NIX_CFLAGS_COMPILE = stdenv.lib.optionalString stdenv.cc.isClang "-Wno-error=unknown-warning-option";
 
   enableParallelBuilds = true;