From dc0b4094abf6784bf1a9492c2fea3fb91116b014 Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Thu, 21 Dec 2023 23:41:57 +0100
Subject: [PATCH] Silence VLA extension warnings in fusefs tests

Building tests/sys/fs/fusefs with clang 18 results the following
warning:

  tests/sys/fs/fusefs/cache.cc:145:14: error: variable length arrays in C++ are a Clang extension [-Werror,-Wvla-cxx-extension]
    145 |         uint8_t buf[bufsize];
        |                     ^~~~~~~

Because we do not particularly care that this is a clang extension,
suppress the warning.

MFC after:	3 days
---
 tests/sys/fs/fusefs/Makefile | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tests/sys/fs/fusefs/Makefile b/tests/sys/fs/fusefs/Makefile
index 6b0a6ef366b0..f45f2f93e1c0 100644
--- a/tests/sys/fs/fusefs/Makefile
+++ b/tests/sys/fs/fusefs/Makefile
@@ -83,6 +83,10 @@ CXXWARNFLAGS+=	-Wno-class-memaccess
 CXXWARNFLAGS.gcc+= -Wno-unused-but-set-variable
 # Suppress warnings about deprecated implicit copy constructors in gtest.
 CXXWARNFLAGS+=  -Wno-deprecated-copy
+.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 180000
+# clang 18.0.0 introduces a new warning about variable length arrays in C++.
+CXXWARNFLAGS+=	-Wno-vla-cxx-extension
+.endif
 CXXFLAGS+=	-I${SRCTOP}/tests
 CXXFLAGS+=	-I${FUSEFS}
 CXXFLAGS+=	-I${MOUNT}