From 492b600d29b12edc0ad654414887484e51492cf4 Mon Sep 17 00:00:00 2001
From: t-karatsu <49965247+t-karatsu@users.noreply.github.com>
Date: Wed, 29 Jan 2020 06:06:37 +0900
Subject: [PATCH] =?UTF-8?q?diffutils:=20Changed=20the=20handling=20of=20un?=
 =?UTF-8?q?declared=20functions=20from=20warning=20=E2=80=A6=20(#14593)?=
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* diffutils: Changed the handling of undeclared functions from warning to error.

* diffutils: Change the handling of warnings or error

* Delete '-Werror=implicit-function-declaration'

* Add '-Qunused-arguments'
---
 var/spack/repos/builtin/packages/diffutils/package.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/var/spack/repos/builtin/packages/diffutils/package.py b/var/spack/repos/builtin/packages/diffutils/package.py
index b87c9174d9..c8f2dca83f 100644
--- a/var/spack/repos/builtin/packages/diffutils/package.py
+++ b/var/spack/repos/builtin/packages/diffutils/package.py
@@ -19,3 +19,8 @@ class Diffutils(AutotoolsPackage, GNUMirrorPackage):
     build_directory = 'spack-build'
 
     depends_on('libiconv')
+
+    def setup_build_environment(self, env):
+        if self.spec.satisfies('%fj'):
+            env.append_flags('CFLAGS',
+                             '-Qunused-arguments')