From d98aee819fd2a7593f26ec7a65deff379c0f4554 Mon Sep 17 00:00:00 2001
From: Franz Pletz <fpletz@fnordicwalking.de>
Date: Tue, 5 Nov 2019 01:55:45 +0100
Subject: [PATCH] linuxPackages.perf: fix build with gcc9

---
 pkgs/os-specific/linux/kernel/perf.nix | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/pkgs/os-specific/linux/kernel/perf.nix b/pkgs/os-specific/linux/kernel/perf.nix
index 1e5c987d508..21615f62a3d 100644
--- a/pkgs/os-specific/linux/kernel/perf.nix
+++ b/pkgs/os-specific/linux/kernel/perf.nix
@@ -50,10 +50,7 @@ stdenv.mkDerivation {
       "-Wno-error=bool-compare"
       "-Wno-error=deprecated-declarations"
       "-DOBJDUMP_PATH=\"${binutils}/bin/objdump\""
-    ]
-    # gcc before 6 doesn't know these options
-    ++ stdenv.lib.optionals (hasPrefix "gcc-6" stdenv.cc.cc.name) [
-      "-Wno-error=unused-const-variable" "-Wno-error=misleading-indentation"
+      "-Wno-error=stringop-truncation"
     ];
 
   doCheck = false; # requires "sparse"