kernel/linux.git/tools/include/nolibc/compiler.h, branch v7.1

tools/nolibc: support UBSAN on gcc

2026-04-09T21:25:40+00:00

The UBSAN implementation in gcc requires a slightly different function attribute to skip instrumentation. Extend __nolibc_no_sanitize_undefined to also handle gcc. Signed-off-by: Thomas Weißschuh Link: https://patch.msgid.link/20260408-nolibc-gcc-15-v1-2-330d0c40f894@weissschuh.net

tools/nolibc: create __nolibc_no_sanitize_ubsan

2026-04-09T21:25:35+00:00

The logic to disable UBSAN will become a bit more complicated. Move it out into compiler.h, so crt.h stays readable. Signed-off-by: Thomas Weißschuh Link: https://patch.msgid.link/20260408-nolibc-gcc-15-v1-1-330d0c40f894@weissschuh.net

tools/nolibc: avoid -Wundef warning for __STDC_VERSION__

2026-03-22T10:03:58+00:00

With -std=c89 the macro __STDC_VERSION__ is not defined. While undefined identifiers in '#if' directives are assumed to be '0', with -Wundef a warning is emitted. Avoid the warning by explicitly falling back to '0' if __STDC_VERSION__ is not provided by the preprocessor. Fixes: 37219aa5b123 ("tools/nolibc: add __nolibc_static_assert()") Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260318-nolibc-wundef-v1-1-fcb7f9ac7298@weissschuh.net

tools/nolibc: Add _NOLIBC_OPTIMIZER_HIDE_VAR() to compiler.h

2026-03-20T16:46:06+00:00

Needed to stop compiler 'optimisations' bloating code. Equivalent to the definition in include/linux/compiler.h Signed-off-by: David Laight Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260308113742.12649-2-david.laight.linux@gmail.com Signed-off-by: Thomas Weißschuh

tools/nolibc: add __nolibc_static_assert()

2026-01-06T11:08:08+00:00

Add a wrapper for _Static_assert() to use within nolibc. While _Static_assert() itself was only standardized in C11, in GCC and clang dialects it is also available in older standards. Link: https://lore.kernel.org/lkml/20251203192330.GA12995@1wt.eu/ Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Reviewed-by: Arnd Bergmann Link: https://patch.msgid.link/20251220-nolibc-uapi-types-v3-13-c662992f75d7@weissschuh.net

tools/nolibc: add compiler version detection macros

2026-01-06T11:08:07+00:00

Some upcoming logic needs to depend on the version of GCC or clang. Add some helper macros to keep the conditionals readable. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Reviewed-by: Arnd Bergmann Link: https://patch.msgid.link/20251220-nolibc-uapi-types-v3-12-c662992f75d7@weissschuh.net

tools/nolibc: use fallthrough rather than fallthrough

2025-10-29T15:29:15+00:00

Use the version of the attribute with underscores to avoid issues if fallthrough has been defined by another header file already. Signed-off-by: Benjamin Berg Signed-off-by: Thomas Weißschuh

tools/nolibc: add __nolibc_aligned() and __nolibc_aligned_as()

2025-04-19T12:17:52+00:00

Provide a convenience macro around __attribute__((aligned)). Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://lore.kernel.org/r/20250419-nolibc-ubsan-v2-2-060b8a016917@weissschuh.net

tools/nolibc: add __nolibc_has_feature()

2025-04-19T12:17:46+00:00

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 Acked-by: Willy Tarreau Link: https://lore.kernel.org/r/20250419-nolibc-ubsan-v2-1-060b8a016917@weissschuh.net

tools/nolibc: compiler: add macro __nolibc_fallthrough

2024-10-07T19:56:18+00:00

Recent version of GCC and clang gained -Wimplicit-fallthrough, warning about implicit fall-through between switch labels. As nolibc does not control the compilation flags, this can trigger warnings for when built by the user. Make use of the "fallthrough" attribute to explicitly annotate the expected fall-throughs and silence the warning. Link: https://lore.kernel.org/r/20240930-nolibc-fallthrough-v2-1-2e8d10fe3430@weissschuh.net Signed-off-by: Thomas Weißschuh