From: Junio C Hamano <gitster@pobox.com>
To: "René Scharfe" <l.s.r@web.de>
Cc: Git List <git@vger.kernel.org>
Subject: Re: [PATCH v2 2/4] do full type check in BARF_UNLESS_COPYABLE
Date: Sun, 08 Jan 2023 16:28:48 +0900 [thread overview]
Message-ID: <xmqqy1qdxz67.fsf@gitster.g> (raw)
In-Reply-To: <4f161041-b299-f79a-e01b-cc00e2880850@web.de> ("René Scharfe"'s message of "Sun, 1 Jan 2023 22:11:20 +0100")
René Scharfe <l.s.r@web.de> writes:
> Use __builtin_types_compatible_p to perform a full type check if
> possible. Otherwise fall back to the old size comparison, but add a
> non-evaluated assignment to catch more type mismatches. It doesn't flag
> copies between arrays with different signedness, but that's as close to
> a full type check as it gets without the builtin, as far as I can see.
This seems to unfortunately break builds for compat/mingw.c
cf. https://github.com/git/git/actions/runs/3865788736/jobs/6589504628#step:4:374
1848 | COPY_ARRAY(&argv2[1], &argv[1], argc);
where the two arrays are "char *const *argv" in the parameter list, and
a local variable
#ifndef _MSC_VER
const
#endif
char **argv2;
It seems that (const char **) and (char **) are compatible but the
pointers themselves being const breaks the type compatibility?
Perhaps the latter should be "(optionally const) char *const *argv2"?
next prev parent reply other threads:[~2023-01-08 7:28 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-30 21:51 [PATCH 0/3] COPY_ARRAY, MOVE_ARRAY, DUP_ARRAY René Scharfe
2022-12-30 21:56 ` [PATCH 1/3] do full type check in COPY_ARRAY and MOVE_ARRAY René Scharfe
2023-01-01 3:03 ` Junio C Hamano
2023-01-01 3:59 ` Junio C Hamano
2023-01-01 7:41 ` René Scharfe
2023-01-01 10:45 ` René Scharfe
2023-01-01 12:11 ` Junio C Hamano
2023-01-01 12:32 ` René Scharfe
2023-01-01 12:46 ` Junio C Hamano
2022-12-30 22:02 ` [PATCH 2/3] add DUP_ARRAY René Scharfe
2022-12-30 22:03 ` [PATCH 3/3] use DUP_ARRAY René Scharfe
2023-01-01 21:05 ` [PATCH v2 0/4] COPY_ARRAY, MOVE_ARRAY, DUP_ARRAY René Scharfe
2023-01-01 21:08 ` [PATCH v2 1/4] factor out BARF_UNLESS_COPYABLE René Scharfe
2023-01-01 21:11 ` [PATCH v2 2/4] do full type check in BARF_UNLESS_COPYABLE René Scharfe
2023-01-08 7:28 ` Junio C Hamano [this message]
2023-01-08 10:10 ` René Scharfe
2023-01-09 4:27 ` Junio C Hamano
2023-01-09 18:08 ` Jeff Hostetler
2023-01-01 21:14 ` [PATCH v2 3/4] add DUP_ARRAY René Scharfe
2023-01-01 21:16 ` [PATCH v2 4/4] use DUP_ARRAY René Scharfe
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