[yocto] Changing default SDK path

[Isak Lichtenstein]

Hi

I'm building an SDK and decided to adapt the default SDK path for each release to allow users to have the SDK of multiple releases installed in parallel without them changing the path during installation.

According to the Yocto Reference Manual, this can be achieved via the SDKPATH variable. Unfortunately changing this variable breaks the generated SDK installer.

I'm using Yocto 1.7.1 and generate the SDK with the following command:
	MACHINE=my-machine bitbake core-image-myimage  -c populate_sdk 

First of all, when building the SDK from scratch (fresh build directory), the generated installer looks complete, but when trying to run it, I get the following error:
       	Enter target directory for SDK (default: /opt/mysdk-v2/): 
	You are about to install the SDK to "/ opt/mysdk-v2". Proceed[Y/n]?
	Extracting SDK...done
	Setting it up...ls: cannot access / opt/mysdk-v2/environment-setup-*: No such file or directory

Additionally, if I then decide to change the SDK path and generate it NOT from scratch, the SDK installer is much smaller, meaning some packages where build for the original SDK path only and therefore not installed, if the path changed.

Finally if I revert to use the default SDK path, but don't build it from scratch, the installer works, but the generated file is slightly smaller (~100K) than the SDK build from scratch.

Is this a bug or maybe SDKPATH isn't meant to be changed?

Best regards

Isak