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Better handling if parent closes REDO_CHEATFDS or MAKEFLAGS fds.

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Silently recover if REDO_CHEATFDS file descriptors are closed, because
they aren't completely essential and MAKEFLAGS-related warnings already
get printed if all file descriptors have been closed.

If MAKEFLAGS --jobserver-auth flags are closed, improve the error
message so that a) it's a normal error instead of an exception and b)
we link to documentation about why it happens.  Also write some more
detailed documentation about what's going on here.
This commit is contained in:
Avery Pennarun 2019-01-18 00:06:18 +00:00
commit 3dbdfbc06f
16 changed files with 136 additions and 47 deletions
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/rodir