[yocto] Incremental rebuild doesn't pick up FILES changes.

[Richard Purdie]

On Tue, 2019-03-05 at 18:28 -0800, Kaz Kylheku (poky) wrote:
> Hi,
> 
> I'm working in a Yocto 2.5 environment.
> 
> In my own layer, I added a bbappend targeting python which does this:
> 
>    FILES_${PN}_remove = "${libdir}/python2.7/encodings"
> 
> Now this didn't take effect as I expected. I had to do a "bitbake -c 
> cleanall python" to rebuild the package.
> 
> In any case, all I have in the image now, as I expected, is these
> four 
> files, vastly reduced from dozens:
> 
>    /usr/lib/python2.7/encodings/{aliases,utf-8}.{py,pyc}
> 
> Now, if I comment out this FILES_${PN}_remove variable assignment, I 
> cannot get the previously removed encoding modules to re-appear in
> my 
> image! I tried "bitbake -c cleanall" on python, and blowing away its 
> build directory. It didn't work; still there are just those four
> files.
> 
> How do we get Yocto to react to FILES changes, short of blowing away
> the entire build tree?

Maybe related to this change:

http://git.yoctoproject.org/cgit.cgi/poky/commit/bitbake/lib/bb/data_smart.py?id=f7f5e30667e1ad8e1ca76ee331be2843f2976bfa

?

Cheers,

Richard