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

[Paul D. Smith]

Update of bug #60774 (project make):

                  Status:                    None => Fixed                  
             Open/Closed:                    Open => Closed                 
       Component Version:                    None => 4.0                    
           Fixed Release:                    None => SCM                    
           Triage Status:                    None => Medium Effort          

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Follow-up Comment #10:

Thanks for the patch Dmitry.  I decided to do a major overhaul of this area of
the code and create os-specific implementations rather than continue to try to
emulate POSIX functions on Windows with fcntl.

On Windows the implementation uses a mutex, as before.

On POSIX systems we create a temporary file and then pass the filename to
child makes and all the makes lock that file instead of stdout.


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