Re: [bug #61409] The code used to create sub-processes on Windows triggers the spawnve() issue

[David Boyce]

> The only thing that is guaranteed to work is to always create the children processes with a NULL environment ...

This has been stated twice as an absolute fact but it leaves an obvious question: why can't GNU make dig up these special "=" env vars on its own and add them to its custom "envp" environment?

On Mon, Nov 29, 2021 at 5:38 AM Liviu Ionescu <INVALID.NOREPLY@gnu.org> wrote:

Follow-up Comment #8, bug #61409 (project make):

> Your suggestion to modify the Make's own environment also won't work well,
because Make invokes programs asynchronously, i.e. it doesn't wait for the
child to exit, and so modifying Make's environment will affect Make itself

I'm not sure this is accurate, my understanding is that the environment is
copied to the child, so once the child is created, the parent can further
change its own environment unhindered.

> report this bug to Microsoft

I'm currently investigating on how to report this to Microsoft, but, as I
said, even if Microsoft fixes the bug, millions of older installs will fail.

> and to MinGW64 folks, and hope that they fix it in a future release.

The folks at Mingw-w64 helped with the detailed diagnose. There is not much
they can do. The only thing that is guaranteed to work is to always create the
children processes with a NULL environment, and this is up to the
application.

Remember, the BusyBox sh.exe, which was the first UCRT program to fail when
invoked by make.exe, so the same sh.exe binary works just fine when invoked
from cmd.exe. I'd bet that cmd.exe creates the process with a NULL
environment.

So, when I report this to Microsoft, they might very well reply that cmd.exe
works, and if make.exe doesn't, I should report this to GNU make folks. ;-)




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