Follow-up Comment #2, bug #57242 (project make):
[comment #1 comment #1:]
> Stefan, the behavior you described is intended.
> make closes the pipe unless the command has + or (MAKE) or {MAKE}.
> This is necessary, because a command can mess up job server operation or a
command may expect a specific fd to be available.
Then at least the information should be consistent and the MAKEFLAGS should
not mention jobserver FDs.
As is, it already messes up make itself - a make process invocated indirectly
may get valid filedescriptors *not* belonging to the jobserver, and start busy
looping on the "read(rfd, 1)" call (when the other end is closed and read
returns 0).
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