linux-kernel - [PATCH 1/6] tools/nolibc: add __nolibc_has

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Message-Id: <20250416-nolibc-ubsan-v1-1-c4704bb23da7@weissschuh.net>
Date: Wed, 16 Apr 2025 20:40:16 +0200
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Willy Tarreau <w@....eu>, "Paul E. McKenney" <paulmck@...nel.org>, 
 Shuah Khan <shuah@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH 1/6] tools/nolibc: add __nolibc_has_feature()

Certain compiler features are signaled via the __has_feature()
preprocessor builtin.

Add a nolibc wrapper for it, similar to __nolibc_has_attribute().

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 tools/include/nolibc/compiler.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/include/nolibc/compiler.h b/tools/include/nolibc/compiler.h
index fa1f547e7f13d151ea98b9c585b36659d2d27324..e6d6dc116e43aa69b37eca02ed1590fc09486bdb 100644
--- a/tools/include/nolibc/compiler.h
+++ b/tools/include/nolibc/compiler.h
@@ -12,6 +12,12 @@
 #  define __nolibc_has_attribute(attr) 0
 #endif

+#if defined(__has_feature)
+#  define __nolibc_has_feature(feature) __has_feature(feature)
+#else
+#  define __nolibc_has_feature(feature) 0
+#endif
+
 #if __nolibc_has_attribute(naked)
 #  define __nolibc_entrypoint __attribute__((naked))
 #  define __nolibc_entrypoint_epilogue()

-- 
2.49.0