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

[Dmitry Goncharov]

Follow-up Comment #2, bug #60774 (project make):

Thanks for your report, Mike.

make uses file locking on stdout to synchronize output.

int fd = fileno(STDOUT);
fcntl (fd, F_SETLKW, &fl);

After fcntl return make prints its output.

In your case another process has /dev/null locked. With make's stdout
redirected to /dev/null, make blocks in this call to fcntl.

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