Add logging to done_acquiring

[NobodyXu]

No description provided.

[NobodyXu]

@chen-hongzhi can you try this patch and provide me with the output of build.rs please?

Thank you!

[chen-hongzhi]

I believe the issue is here:

cc-rs/src/parallel/stderr.rs

Line 28 in 022f729

if unsafe { libc::fcntl(fd, libc::F_SETFL, flags | libc::O_NONBLOCK) } == -1 {

It leads to no unset O_NONBLOCK.

[NobodyXu]

Thank you so much, looks like I forgot to update it when copy pasing the code!

We really need more maintainers for cc, to spot the mistakes I'm making.