grpc: only set -Wno-error on clang

Apparently GCC errors on this:

https://hydra.nixos.org/build/83561519/
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Matthew Bauer 2018-11-03 14:03:34 -05:00 committed by GitHub
parent ef16e1fe03
commit f0cee6b14f
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@ -26,7 +26,7 @@ stdenv.mkDerivation rec {
rm -vf BUILD 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; enableParallelBuilds = true;