[yocto] Concept clarification: can we deploy Yocto SDK to target?

[Jerry Lian]

Thanks Paul for your expert explanation, though I may not fully understand
yet.
Here is my scenario when raising my question:
* After deploying yocto image to hardware-target, I try build an
application (Autotools-based)
* The build stopped and asked for linux kernel source.

* So my image already contains compilers and linkers?
* So am I missing libraries, or just linux-headers?
* what is difference between libraries and headers?

Thanks!








On Wed, Nov 29, 2017 at 6:03 PM, Paul Eggleton <
paul.eggleton at linux.intel.com> wrote:

> Hi Jerry,
>
> On Thursday, 30 November 2017 10:35:32 AM NZDT Jerry Lian wrote:
> > I am confused about the concept of Yocto SDK:
> > * when we use "bitbake -c populate_sdk some_image", we obtain sysroots
> for
> > both target and host.
> > * But why do we need sysroot for host?
>
> The host sysroot actually contains the main part of the SDK - the cross-
> compiler and other tools that need to run on the host. The target part
> usually
> doesn't include any executable binaries, only libraries and debugging
> symbols.
>
> > * I know we can build application under target-sysroot (surely source the
> > environment), with fast speed.
> > * But can we deploy target-sysroot to hardware-target?
> > (Yes, I do want to compile/build application inside hardware-target, even
> > though it is slow)
>
> I would suggest an alternative - install the compiler and tools into your
> image. You could do this when building the image, or alternatively if you
> enable package management in the image you could install them after the
> fact.
> At the image level there's a "tools-sdk" IMAGE_FEATURES item that will
> install
> the appropriate packages; alternatively you can install
> packagegroup-core-sdk
> which is effectively the same thing or for something a little more
> lightweight
> there is packagegroup-core-buildessential (roughly equivalent to debian's
> build-essential).
>
> Cheers,
> Paul
>
> --
>
> Paul Eggleton
> Intel Open Source Technology Centre
>
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