[CMake] 138% progress when building both all and not-in-all target?

[Leif Walsh]

wow


On Fri, Jun 20, 2014 at 10:31 AM, Dan Kegel <dank at kegel.com> wrote:

> It occurs to me that invoking make on this cmake-generated makefile
> with two targets and -j4 has indeed triggered a more serious problem,
> and the build fails nondeterministically with an internal error in ld
> (presumably because the linker's being invoked twice in parallel on
> the same file?).
> See https://bugs.launchpad.net/ubuntu/+source/binutils/+bug/423756
>
> On Fri, Jun 20, 2014 at 6:45 AM, Dan Kegel <dank at kegel.com> wrote:
> > On Fri, Jun 20, 2014 at 3:02 AM, David Cole <dlrdave at aol.com> wrote:
> >>>> 138%
> >>>> make -j4 all examples_noinst
> >>
> >>> I've seen this too but never noticed a pattern about when it happens.
> >>
> >> Does it always happen when naming more than one target with make -j?
> >>
> >> I thought you were not supposed to name more than one target with make
> -j...
> >> (but I don't understand fully exactly why that's a bad thing...)
> >
> > make itself certainly doesn't have a bug along these lines; you can make
> -j
> > a hundred targets at once and it won't double-build -- if the Makefile
> > has proper dependencies.
> >
> > I could try to demonstrate the problem with a tiny CMakeLists.txt,
> > but I'm not sure when I'll have time.
> > - Dan
>



-- 
Cheers,
Leif
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