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[2001:14ba:6e:3100:e3bd:e249:333e:6a5a]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-59301f83c96sm1773523e87.101.2025.10.26.12.58.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 26 Oct 2025 12:58:54 -0700 (PDT) From: =?UTF-8?q?Hanne-Lotta=20M=C3=A4enp=C3=A4=C3=A4?= To: akpm@linux-foundation.org Cc: kees@kernel.org, gustavoars@kernel.org, skhan@linuxfoundation.org, david.hunter.linux@gmail.com, linux-kernel@vger.kernel.org, linux-kernel-mentees@lists.linux.dev, =?UTF-8?q?Hanne-Lotta=20M=C3=A4enp=C3=A4=C3=A4?= Subject: [PATCH] headers: Add check for C standard version Date: Sun, 26 Oct 2025 21:58:46 +0200 Message-ID: <20251026195846.69740-1-hannelotta@gmail.com> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: linux-kernel-mentees@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Compiling the kernel with GCC 15 results in errors, as with GCC 15 the default language version for C compilation has been changed from -std=gnu17 to -std=gnu23 - unless the language version has been changed using KBUILD_CFLAGS += -std=gnu17 or earlier. C23 includes new keywords 'bool', 'true' and 'false', which cause compilation errors in Linux headers: ./include/linux/types.h:30:33: error: ‘bool’ cannot be defined via ‘typedef’ ./include/linux/stddef.h:11:9: error: cannot use keyword ‘false’ as enumeration constant Add check for C Standard's version in the header files to be able to compile the kernel with C23. Signed-off-by: Hanne-Lotta Mäenpää --- include/linux/stddef.h | 2 ++ include/linux/types.h | 2 ++ 2 files changed, 4 insertions(+) diff --git a/include/linux/stddef.h b/include/linux/stddef.h index 80b6bfb944f0..aa2cb3db3c06 100644 --- a/include/linux/stddef.h +++ b/include/linux/stddef.h @@ -7,10 +7,12 @@ #undef NULL #define NULL ((void *)0) +#if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 202311L enum { false = 0, true = 1 }; +#endif #undef offsetof #define offsetof(TYPE, MEMBER) __builtin_offsetof(TYPE, MEMBER) diff --git a/include/linux/types.h b/include/linux/types.h index 6dfdb8e8e4c3..931db48a7a09 100644 --- a/include/linux/types.h +++ b/include/linux/types.h @@ -32,7 +32,9 @@ typedef __kernel_timer_t timer_t; typedef __kernel_clockid_t clockid_t; typedef __kernel_mqd_t mqd_t; +#if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 202311L typedef _Bool bool; +#endif typedef __kernel_uid32_t uid_t; typedef __kernel_gid32_t gid_t; -- 2.51.0