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From: Richard Purdie <richard.purdie@linuxfoundation.org>
To: "biannm@cn.fujitsu.com" <biannm@cn.fujitsu.com>
Date: Mon, 04 Aug 2014 11:24:02 +0100
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Cc: "poky@yoctoproject.org" <poky@yoctoproject.org>
Subject: Re: [Question]Does poky rebuild source when only makefile was modified
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On Mon, 2014-08-04 at 10:01 +0000, biannm@cn.fujitsu.com wrote:
> Hi,
> 
>  Usually, if only makefile is modified, "make" will not rebuild source.
>  Does poky rebuild source in the following case.
> 
>  1. build a recipe
>  2. modify the bb file of this recipe, which will cause only makefile to be modified.
>     Ex. set a new path to libdir
>  3. rebuild this recipe without doing cleansstate before

This change to libdir would change the checksum of the configure task
and the configure task would execute. Assuming this is an autotools
recipe (where B != S is supported), it would wipe out ${B} due to the
change and rebuild everything from the configure step onwards.

Cheers,

Richard