Date: Tue, 16 Dec 2025 20:22:41 +0000 From: Alex Richardson <arichardson@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: 802c6d5d61d1 - main - cdefs.h: Introduce __nonstring attribute Message-ID: <6941bf91.36d57.28d9764b@gitrepo.freebsd.org>
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The branch main has been updated by arichardson: URL: https://cgit.FreeBSD.org/src/commit/?id=802c6d5d61d15494a54a386dc2ffbcfefc68c8ab commit 802c6d5d61d15494a54a386dc2ffbcfefc68c8ab Author: Alex Richardson <arichardson@FreeBSD.org> AuthorDate: 2025-12-16 18:03:44 +0000 Commit: Alex Richardson <arichardson@FreeBSD.org> CommitDate: 2025-12-16 20:21:45 +0000 cdefs.h: Introduce __nonstring attribute This attribute can be used to annotate char arrays that are not supposed to be terminated with a NUL char and is needed to silence clang's new -Wunterminated-string-initialization warning. The name matches linuxkpi. Reviewed by: emaste, jhb MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D52565 --- sys/sys/cdefs.h | 7 +++++++ tools/build/cross-build/include/common/sys/cdefs.h | 8 ++++++++ 2 files changed, 15 insertions(+) diff --git a/sys/sys/cdefs.h b/sys/sys/cdefs.h index 3bc4389346d2..ea6a92ad0056 100644 --- a/sys/sys/cdefs.h +++ b/sys/sys/cdefs.h @@ -394,6 +394,13 @@ #define __printf0like(fmtarg, firstvararg) #endif +/* To silence warnings about null terminator not fitting into an array. */ +#if __has_attribute(__nonstring__) +#define __nonstring __attribute__((__nonstring__)) +#else +#define __nonstring +#endif + #define __strong_reference(sym,aliassym) \ extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym))) #ifdef __STDC__ diff --git a/tools/build/cross-build/include/common/sys/cdefs.h b/tools/build/cross-build/include/common/sys/cdefs.h index faad5eccb3af..c7e453394478 100644 --- a/tools/build/cross-build/include/common/sys/cdefs.h +++ b/tools/build/cross-build/include/common/sys/cdefs.h @@ -100,6 +100,14 @@ __attribute__((__format__(__printf0__, fmtarg, firstvararg))) #endif +#ifndef __nonstring +#if __has_attribute(__nonstring__) +#define __nonstring __attribute__((__nonstring__)) +#else +#define __nonstring +#endif +#endif + #ifndef __predict_true #define __predict_true(exp) __builtin_expect((exp), 1) #endifhelp
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