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.eggle...@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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