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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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GPG key ID: B5690EEEBB952194
29 changed files with 131 additions and 104 deletions
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4
Modules/_csv.c
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@ -731,7 +731,7 @@ parse_process_char(ReaderObj *self, _csvstate *module_state, Py_UCS4 c)
}
/* normal character - handle as START_FIELD */
self->state = START_FIELD;
/* fallthru */
_Py_FALLTHROUGH;
case START_FIELD:
/* expecting field */
self->unquoted_field = true;
@ -785,7 +785,7 @@ parse_process_char(ReaderObj *self, _csvstate *module_state, Py_UCS4 c)
case AFTER_ESCAPED_CRNL:
if (c == EOL)
break;
/*fallthru*/
_Py_FALLTHROUGH;
case IN_FIELD:
/* in unquoted field */