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gh-121040: Use __attribute__((fallthrough)) (#121044)

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Fix warnings when using -Wimplicit-fallthrough compiler flag.

Annotate explicitly "fall through" switch cases with a new
_Py_FALLTHROUGH macro which uses __attribute__((fallthrough)) if
available. Replace "fall through" comments with _Py_FALLTHROUGH.

Add _Py__has_attribute() macro. No longer define __has_attribute()
macro if it's not defined. Move also _Py__has_builtin() at the top
of pyport.h.

Co-Authored-By: Nikita Sobolev <mail@sobolevn.me>
This commit is contained in:
Victor Stinner 2024-06-27 11:58:44 +02:00 • committed by GitHub
parent 4999e0bda0
commit 12af8ec864
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29 changed files with 131 additions and 104 deletions
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Python/getargs.c
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@ -2676,7 +2676,7 @@ skipitem(const char **p_format, va_list *p_va, int flags)
goto err;
format++;
}
/* fall through */
_Py_FALLTHROUGH;
case 's': /* string */
case 'z': /* string or None */