[yocto] Preventing a variable from being cached

[Alexander Kanavin]

On 12/07/2017 10:30 PM, Paul Knopf wrote:
> Use a SRC_URI for another recip? Let me show you my recipe.
> 
> SUMMARY = "Puts a file in the image that contains the application version."
> DESCRIPTION = "Puts a file in the image that contains the application 
> version."

Openembedded isn't really designed for this. The principle is that the 
output of a recipe is determined entirely by what is in the recipe and 
the source code it pulls in (and dependencies). If a task has 
successfully completed, it should not be run again if nothing has changed.

So you need to udpate the necessary files with an external script before 
you run bitbake, and then pull them in via SRC_URI and file fetcher.

Alex