[CMake] Redundant linking when modifying shared libraries

[Itay Chamiel]

Sounds good. The FAQ has a question "Is there a way to skip checking
of dependent libraries when compiling?" - perhaps you can add one just
before that, something like "Is there a way to reduce the amount of
linking when building a large project?".or similar.

Thanks again,

itay

On Thu, Feb 14, 2019 at 11:26 PM Robert Maynard
<robert.maynard at kitware.com> wrote:
>
> I agree that we should document this property better.
> I recommend looking at the CMake wiki (
> https://gitlab.kitware.com/cmake/community/wikis/home ) and thinking
> maybe adding a new recipe for `optimizing redundant linking`.
>
> On Thu, Feb 14, 2019 at 3:11 PM Itay Chamiel <itay.chamiel at orcam.com> wrote:
> >
> > On Thu, Feb 14, 2019 at 8:08 PM Robert Maynard
> > <robert.maynard at kitware.com> wrote:
> > > By default CMake wants to get a correct build 100% of the time. There
> > > is nothing to stop people from having functions defined in a .cxx file
> > > with no corresponding header, and using manual forward deceleration is
> > > used in a consuming library/executable. By setting
> > > `LINK_DEPENDS_NO_SHARED` to `True` you will convert what was a link
> > > time error ( renaming the function in the .cxx ) to a run time error.
> >
> > First of all, thanks for the answer - it's good to understand the
> > rationale and to know that in our use case we can safely use this
> > setting.
> >
> > On the question of whether to set this as the default, I understand
> > your position and I personally disagree - but do not wish to start a
> > debate. However I will say that this simple change has, in a common
> > case, reduced my build time from 5 minutes to 15 seconds. At the very
> > least could you consider steps to make this setting more known and
> > accessible? (No one on Stack Overflow knew about it, and I think
> > that's saying something.) Perhaps put it in a FAQ, and/or more
> > prominently in the documentation.
> >
> > Kind regards,
> >
> > itay
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-- 
Itay Chamiel, Software Engineer
itay.chamiel at orcam.com | Office: +972-2-591-7800, ext. 7814
OrCam Technologies  www.orcam.com