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Bug#740397: busybox: please add support for parallel building



Ian Campbell <ijc@hellion.org.uk> (2014-03-01):
> On Sat, 2014-03-01 at 03:17 +0100, Cyril Brulebois wrote:
> > -       $(MAKE) -C ${DIR} install docs/busybox.1 \
> > +       $(MAKE) -j$(NUMJOBS) -C ${DIR} install docs/busybox.1 \
> 
> If parallel build is not set then won't this end up passing a bare "-j"
> which will run an unlimited number of jobs...
> 
> https://www.debian.org/doc/debian-policy/ch-source.html suggests:
> 
>      ifneq (,$(filter parallel=%,$(DEB_BUILD_OPTIONS)))
>          NUMJOBS = $(patsubst parallel=%,%,$(filter parallel=%,$(DEB_BUILD_OPTIONS)))
>          MAKEFLAGS += -j$(NUMJOBS)
>      endif
> 
> to avoid this.

Well I didn't want to set MAKEFLAGS unconditionally (not sure how other
$(MAKE) calls deal with parallelism), so I've written crap instead; oops
thanks for catching. If following policy's suggestion isn't possible, we
could add "else\nNUMJOBS = 1" to avoid what you spotted.

Mraw,
KiBi.

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