From: "Thomas Weißschuh" <linux@weissschuh.net>
To: Arnd Bergmann <arnd@arndb.de>,
Nathan Chancellor <nathan@kernel.org>,
Nicolas Schier <nsc@kernel.org>
Cc: linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org,
"David Howells" <dhowells@redhat.com>,
"Thomas Weißschuh" <linux@weissschuh.net>
Subject: [PATCH RFC 4/5] kbuild: uapi: provide a C++ compatible dummy definition of NULL
Date: Sun, 08 Mar 2026 22:24:04 +0100 [thread overview]
Message-ID: <20260308-kbuild-uapi-c-v1-4-86aae09a7f1d@weissschuh.net> (raw)
In-Reply-To: <20260308-kbuild-uapi-c-v1-0-86aae09a7f1d@weissschuh.net>
NULL works differently in C++ compared to C.
To allow testing the UAPI headers against C++ compilers, provide
a variant of NULL which works with those.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
---
usr/dummy-include/stddef.h | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/usr/dummy-include/stddef.h b/usr/dummy-include/stddef.h
index a61703d1c896..525489daffe2 100644
--- a/usr/dummy-include/stddef.h
+++ b/usr/dummy-include/stddef.h
@@ -3,6 +3,11 @@
#define _DUMMY_STDDEF_H
#define offsetof(TYPE, MEMBER) __builtin_offsetof(TYPE, MEMBER)
+
+#ifdef __cplusplus
+#define NULL 0
+#else
#define NULL ((void *)0)
+#endif
#endif /* _DUMMY_STDDEF_H */
--
2.53.0
next prev parent reply other threads:[~2026-03-08 21:24 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-08 21:24 [PATCH RFC 0/5] kbuild: uapi: also test UAPI headers against C++ compilers Thomas Weißschuh
2026-03-08 21:24 ` [PATCH RFC 1/5] kbuild: uapi: move some compiler arguments out of the command definition Thomas Weißschuh
2026-03-08 21:24 ` [PATCH RFC 2/5] kbuild: uapi: move all include path flags together Thomas Weißschuh
2026-03-08 21:24 ` [PATCH RFC 3/5] kbuild: uapi: handle UML in architecture-specific exclusion lists Thomas Weißschuh
2026-03-08 21:24 ` Thomas Weißschuh [this message]
2026-03-08 21:24 ` [PATCH RFC 5/5] kbuild: uapi: also test UAPI headers against C++ compilers Thomas Weißschuh
2026-03-12 8:15 ` Nathan Chancellor
2026-03-12 8:16 ` [PATCH RFC 0/5] " Nathan Chancellor
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