[bug #60774] make hangs on fcntl lock when using -O and stdout is /dev/null

[Dmitry Goncharov]

Follow-up Comment #7, bug #60774 (project make):

The windows code, which passes down the semaphore to children is reused to
pass down the fd on unix.

> The way you propose to reuse the Windows code brings that Windows-specific
stuff back into view.

it is not clear to me what windows specific stuff you mean.
Let us go over it?

record_sync_mutex reads the value of the fd from the env variable. Reused
between unix and windows.

prepare_mutex_handle_string stores the value of the fd in makeflags. Reused
between unix and windows.

create_mutex is modified to return the value of the semaphore. Still windows
specific.

mutex_handle - global variable. Removed. Instead of mutex_handle and
sync_handle, there is only sync_handle.



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