Hi Igor,
At this point it's really not a CMake question, but a GNU Make one... The
answer is actually right there in the first warning that you got.
make[4]: warning: jobserver unavailable: using -j1. Add `+' to parent make
rule.
I have to admit that I'm not absolutely sure about all the subtleties of this,
but I defined my own build rules in the past that call make themselves, like:
core::
+(cd core; make)
With this, GNU Make is able to distribute the jobs between the subdirectories.
(I have a number of such targets in my main Makefile.)
Cheers,
Attila
> On 14 Dec 2015, at 07:34, Igor Sobinov <sl...@mail.ru> wrote:
>
> Hello Bill,
>
> Thanks, that's clear.
>
> So, If I write in makefile
>
>
> build_release: $(RELEASE_DIR)
> @cd $(RELEASE_DIR); $(MAKE) release
>
> I got an error
>
> Also if I write
>
> build_release: $(RELEASE_DIR)
> $(MAKE) release -C $(RELEASE_DIR)
>
> I got an error too
>
> But this is successfull command:
> # cd $RELEASE_DIR; make release -j10
>
> Why make doesn't support jobs for subdirs?
>
>
> Пятница, 11 декабря 2015, 14:14 -05:00 от Bill Hoffman
> <bill.hoff...@kitware.com>:
>
> On 12/11/2015 7:24 AM, Igor Sobinov wrote:
> > Hello Bill,
> >
> > yes, make release is a custom command but that's not important.
> > I do the following:
> > # cd /home/igor/build_root/release_target
> > # make release -j5
> Yes, it is important, it is the reason it is not working. The custom
> command needs to use $(MAKE) and not make to call make or you will get
> this error. Child make calls need environment variables to get parallel
> builds to work. The MAKE env var is used to pass them around.
>
> -Bill
>
>
>
> Bye, Igor
>
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