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To: cygwin AT cygwin DOT com
Subject: tfind missing a const qualifier.
Date: Wed, 23 Apr 2025 20:28:03 -0700
Message-ID: <87tt6exmpo.fsf@gmail.com>
User-Agent: Gnus/5.13 (Gnus v5.13)
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From: Collin Funk via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Collin Funk <collin DOT funk1 AT gmail DOT com>
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Sender: "Cygwin" <cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com>

Hi,

While testing gnulib I noticed that tfind on cygwin is defined like:

    void *tfind (const void *, void **,
                 int (*) (const void *, const void *));

But POSIX requires [1] (*):

    void *tfind (const void *key, void *const *rootp,
                int (*compar) (const void *, const void *));

For programs written expecting the POSIX prototype, there will be many
warnings that 'rootp' has it's const qualifier discarded.

Collin

[1] https://pubs.opengroup.org/onlinepubs/9799919799/functions/tfind.html

(*) Ignoring the fact that POSIX.1-2024 added the requirement for
'typedef void posix_tnode;'.

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