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Date:	Mon, 31 Mar 2025 11:28:44 +0200
To:	cygwin AT cygwin DOT com
Subject:	Re: Crashes in cmake subprocesses since 3.6.0
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	<7eaea471-d453-efc7-19cc-58e0ee187af0 AT jdrake DOT com>
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From:	Corinna Vinschen via Cygwin <cygwin AT cygwin DOT com>
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Cc:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
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On Mar 30 22:58, Jeremy Drake via Cygwin wrote:
> On Mon, 31 Mar 2025, Christoph Reiter via Cygwin wrote:
> 
> > Starting with 3.6.0 when cmake calls into make/ninja/gcc there is a chance of
> > that failing, for example like this:
> >
> > CMake Error: Generator: build tool execution failed, command was:
> > /usr/bin/cmake.exe -E env VERBOSE=1 /usr/bin/make.exe -f Makefile
> > cmTC_c87e2/fast
> >
> > * Problem starts with cygwin 3.6.0
> 
> I've also reproduced this with cygwin 3.7.0-0.19.g6c5537c0298e, but it
> doesn't reproduce as readily as with cygwin 3.6.0-1.

Yes, I can reproduce fails as well, but I don't see an easy way to
debug this.  Your testcase just fails but runs along afterwards.

I'm completely cmake-illiterate, which isn't a great help either.

Two points:

- It's unlikely that this occurs only with 3.6.0-1 and later.  It's more
  likely that it occurs on the way from 3.5 to 3.6.  Unfortunately the
  remaining 3.6.0 test builds are only going back to patchlevel 429 or
  so.

  Any chance one of you could bisect Cygwin and find out which commit
  introduced the problem?

- Also, since this seems to affect certain cmake versions only, can the
  cmake maintainers help here, perhaps?


Thanks,
Corinna

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