Re: [spurious parallel build bug] make -j fails with: "mv: mv: cannot stat `perl.mak': No such file or directory"

* Junio C Hamano [off-list ref] wrote:

Ingo Molnar [off-list ref] writes:

quoted

I got this when i built v1.6.3-rc3 for the first time:

$ make -j
[...]
    CC builtin-annotate.o
    CC builtin-apply.o
    CC builtin-archive.o
    CC builtin-bisect--helper.o
mv: mv: cannot stat `perl.mak': No such file or directory
mv: cannot stat `perl.mak': No such file or directory
    CC builtin-blame.o
mv: cannot stat `perl.mak': No such file or directory
mv: cannot stat `perl.mak': No such file or directory
cannot stat `perl.mak': No such file or directory

a plain 'make' worked.

Interestingly, a second attempt to reproduce it after a 'make 
clean' failed to trigger the bug. So it's either timing 
sensitive or there's some other weirdness that caused this.

I've seen this a few times on the master machine at k.org but 
haven't seen it elsewhere, perhaps because I do not have an access 
to 8-way parallelism anywhere else.

btw, this happened on a plain dual-core box. But i couldnt reproduce 
after that.

	Ingo