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tools/nolibc: avoid -Wundef warning for __STDC_VERSION__

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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: 37219aa5b1 ("tools/nolibc: add __nolibc_static_assert()")
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://patch.msgid.link/20260318-nolibc-wundef-v1-1-fcb7f9ac7298@weissschuh.net
This commit is contained in:
Thomas Weißschuh
2026-03-18 17:12:42 +01:00
parent 9da0f529c0
commit 3eb97c4cbd
1 changed files with 7 additions and 1 deletions
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8
tools/include/nolibc/compiler.h
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@@ -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, "")