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Date: Tue, 31 Oct 2023 13:33:59 +0100
From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: Bruno Haible <bruno@clisp.org>
Cc: cygwin@cygwin.com
Subject: Re: feraiseexcept does not raise traps in Cygwin
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Hi Bruno,

On Oct 25 11:21, Bruno Haible via Cygwin wrote:
> Hi,
> 
> Seen on
>   - Cygwin 3.4.6 or 2.9.0 on x86_64.
>   - Cygwin 2.9.0 on i386.
> 
> According to ISO C 23 § 7.6.4.3
>   "The feraiseexcept function attempts to raise the supported floating-point
>    exceptions represented by its argument. 266)
>    Footnote 266) The effect is intended to be similar to that of floating-point
>    exceptions raised by arithmetic operations. Hence, implementation extensions
>    associated with raising a floating-point exception (for example, enabled
>    traps or IEC 60559 alternate exception handling) should be honored."
> 
> This does not work. How to reproduce:
> [...]

Thanks for the report and the simple testcase.  I checked in a patch.
It will be in the test build cygwin-3.5.0-0.450.g2ef627c46eb2 in an
hour or two, if you want to give it a try.


Thanks again,
Corinna