Re: [Question]Does poky rebuild source when only makefile was modified

[Richard Purdie <richard.purdie@linuxfoundation.org>]

On Tue, 2014-08-05 at 10:23 +0000, biannm@cn.fujitsu.com wrote:
> > On Tue, 2014-08-05 at 05:57 +0000, biannm@cn.fujitsu.com wrote:
> > > If $B != $S is supported, there is not a problem.
> > > When we rebuild a recipe where $B != $S is not supported, although
> > > tasks will be redone, the source files will not be rebuild if we just
> > change the libdir.
> > 
> > It depends on the Makefiles. Some work well, some don't.
> 
> Yes, i think so too.
> And, does you mean this is not the problem of yocto, we don't need care it?

Well, you could force the build system to wipe out and reconstruct ${S}
any time there was a change. For better or worse we've effectively
decided that its too much overhead for day to day use. If you need that
level of determinism, you can wipe TMPDIR.

> > > Does you mean that we just make this recipe to support  $B != $S in this
> > case.
> > 
> > Yes, that would be one way to solve the problem.
> 
> But how can i divide those recipe from normal one,
> it's not easy to understand for yocto developer because the rebuild will not report any message in this case.

Its a limitation of the software we're building so its not something its
easy for "Yocto" to fix...

Cheers,

Richard