From: Thomas Weißschuh Date: Wed, 18 Mar 2026 16:12:42 +0000 (+0100) Subject: tools/nolibc: avoid -Wundef warning for __STDC_VERSION__ X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=3eb97c4cbd4d874e7e327ec512f6169934e12b8a;p=thirdparty%2Fkernel%2Flinux.git tools/nolibc: avoid -Wundef warning for __STDC_VERSION__ 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 --- diff --git a/tools/include/nolibc/compiler.h b/tools/include/nolibc/compiler.h index f03f84cfadce2..1c410a62c5289 100644 --- a/tools/include/nolibc/compiler.h +++ b/tools/include/nolibc/compiler.h @@ -47,6 +47,12 @@ # define __nolibc_fallthrough do { } while (0) #endif /* __nolibc_has_attribute(fallthrough) */ +#if defined(__STDC_VERSION__) +# define __nolibc_stdc_version __STDC_VERSION__ +#else +# define __nolibc_stdc_version 0 +#endif + #define __nolibc_version(_major, _minor, _patch) ((_major) * 10000 + (_minor) * 100 + (_patch)) #ifdef __GNUC__ @@ -63,7 +69,7 @@ # define __nolibc_clang_version 0 #endif /* __clang__ */ -#if __STDC_VERSION__ >= 201112L || \ +#if __nolibc_stdc_version >= 201112L || \ __nolibc_gnuc_version >= __nolibc_version(4, 6, 0) || \ __nolibc_clang_version >= __nolibc_version(3, 0, 0) # define __nolibc_static_assert(_t) _Static_assert(_t, "")