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From: Philipp Stephani <p.stephani2@gmail.com>
To: 32924@debbugs.gnu.org
Subject: bug#32924: 27.0.50; Error building master on macOS Mojave
Date: Wed, 3 Oct 2018 22:44:25 +0200	[thread overview]
Message-ID: <CAArVCkS8V02sQ5b9QdZ63xvovzp5hOV-XT6TqO49cB2ikVfLFw@mail.gmail.com> (raw)
In-Reply-To: <m25zyilrjk.fsf@gmail.com>

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Philipp <p.stephani2@gmail.com> schrieb am Mi., 3. Okt. 2018 um 22:12 Uhr:

>
> ./globals.h:1075:1: error: arithmetic on a null pointer treated as a cast
> from integer to pointer is a GNU extension
> [-Werror,-Wnull-pointer-arithmetic]
> ./lisp.h:835:53: note: expanded from macro 'TAG_PTR'
>   LISP_INITIALLY ((Lisp_Word) ((untagged_ptr) (ptr) + LISP_WORD_TAG (tag)))
>

Some discussion around this topic:
http://releases.llvm.org/6.0.0/tools/clang/docs/ReleaseNotes.html#improvements-to-clang-s-diagnostics
, https://reviews.llvm.org/D37042,
http://lists.llvm.org/pipermail/llvm-dev/2017-July/115053.html. Given that
the TAG_PTR implementation is technically undefined behavior, would it be
possible to change the definition (e.g. to use intptr_t instead of char*)?

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  reply	other threads:[~2018-10-03 20:44 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-03 20:10 bug#32924: 27.0.50; Error building master on macOS Mojave Philipp
2018-10-03 20:44 ` Philipp Stephani [this message]
2018-10-09 18:19 ` Paul Eggert

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