[bug #57242] Non-recursive command passes invalid jobserver file descriptors

[John Regehr]

Follow-up Comment #6, bug #57242 (project make):

I can't speak about the broader situation but Paul's "much simpler" option
would certainly be sufficient for my use case.

Something else that would be useful to us is a way to force make to consider
some or all subprograms to be recursive make invocations. The "+" convention
does not work well for us because we're working with third party (and usually
auto-generated) makefiles and it's no fun to mark these up with "+"
characters. I'm currently working around this using a one-line patch to make,
but that isn't something that I can generally expect other people to do.

Regarding the named pipe, I assume this would also solve the issue where
there's some uncertainty about the inherited jobserver fds being blocking vs.
non-blocking, because every client would simply open the pipe in whatever mode
suited it? If so, then I'm all for it.

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