[yocto] contradictory explanations of IMAGE_INSTALL in yocto manuals

[Rudolf Streif]

I don't think that there is a difference. At least not from my experience.
Every time I have the choice I tried both variants and then examined the
resulting variable e.g.

bitbake <recipe> -e | grep IMAGE_INSTALL

It looked the same. My conclusion is to use += and =+ for variables and
_append and _prepend for tasks. But I could possibly be wrong since there
are definitely many more cases than I have tried. Hence, it would probably
be prudent to dig into Bitbake's code to see how it handles _append and
_prepend. I have not had time to do that.

Rudi

On Fri, Mar 9, 2012 at 8:56 AM, Robert P. J. Day <rpjday at crashcourse.ca>wrote:

> On Fri, 9 Mar 2012, Rudolf Streif wrote:
>
> > I tried the versions _append and += as well as _prepend and =+ with
> > the IMAGE_INSTALL and other variables. So far I have not run into
> > any issues where one would behave differently from the other. The
> > only thing you have to remember with the _append and _prepend
> > versions is that you have to include a space at the beginning for
> > _append and at the end for _prepend. Although I have found that not
> > always to be consistent either. However, an additional space does
> > not hurt.
>
>   well, as i mentioned, the manual suggests quite strongly that there
> is a fundamental difference.  i'd just like to understand clearly what
> that is.
>
> rday
>
> --
>
> ========================================================================
> Robert P. J. Day                                 Ottawa, Ontario, CANADA
>                        http://crashcourse.ca
>
> Twitter:                                       http://twitter.com/rpjday
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