From 45feade38ec3e8e30086dedc6ee81cbf816293e3 Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Thu, 26 Aug 2021 17:36:03 +0200
Subject: [PATCH] Add -Wno-error=unused-but-set-variable when building with
 Clang 13+

This warning triggers many times while building world. Downgrade it to a
warning until all occurrences have been fixed. Once the Clang warnings
have been fixed we should be able to turn it on for GCC as well. See
also f4fed768bba45a406f73ed1491d7e52fd1a8711d which did the same for the
kernel builds.

Reviewed by:	arichardson, imp
MFC after:	3 days
Differential Revision: https://reviews.freebsd.org/D31927
---
 share/mk/bsd.sys.mk | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/share/mk/bsd.sys.mk b/share/mk/bsd.sys.mk
index a4bb54e1989..304d8dd7d24 100644
--- a/share/mk/bsd.sys.mk
+++ b/share/mk/bsd.sys.mk
@@ -80,6 +80,9 @@ CWARNFLAGS+=	-Wno-pointer-sign
 .if ${WARNS} <= 6
 CWARNFLAGS.clang+=	-Wno-empty-body -Wno-string-plus-int
 CWARNFLAGS.clang+=	-Wno-unused-const-variable
+.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 130000
+CWARNFLAGS.clang+=	-Wno-error=unused-but-set-variable
+.endif
 .endif # WARNS <= 6
 .if ${WARNS} <= 3
 CWARNFLAGS.clang+=	-Wno-tautological-compare -Wno-unused-value\