Re: Compiling in mingw-ucrt runtime

[Eli Zaretskii]

> From: Bruno Haible <bruno@clisp.org>
> Cc: emacs-devel@gnu.org
> Date: Sun, 25 Feb 2024 15:11:22 +0100
> 
> Eli Zaretskii wrote:
> > > > OK, but I asked also about the value of errno _after_ fclose is called
> > > > and fails.  It's important for understanding why it fails.
> 
> On native Windows, the value of errno, after fclose() fails, is undefined.
> See here in the Gnulib documentation:
> https://www.gnu.org/software/gnulib/manual/html_node/fclose.html
> 
> and here in the Microsoft documentation:
> https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/fclose-fcloseall
> (it sets errno only if the argument was a NULL pointer).

Strange that they claim that, because their sources tell a different
story, both for MSVCRT and for UCRT.  Or maybe your interpretation of
what they say there is inaccurate?

> > Why does fclose fail, leaving errno at -1?
> 
> I cannot tell why fclose() failed in the first place.

Right, that was part of my question ;-)