Re: [dpdk-dev] [PATCH] mk: allow updates to build config on make install

["Richardson, Bruce" <bruce.richardson@intel.com>]

> -----Original Message-----
> From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> Sent: Wednesday, May 14, 2014 11:34 AM
> To: Richardson, Bruce
> Cc: dev@dpdk.org
> Subject: Re: [dpdk-dev] [PATCH] mk: allow updates to build config on make
> install
> 
> Hi Bruce
> 
> 2014-05-14 11:22, Bruce Richardson:
> > There was an issue with rebuilding the code following a change to one
> > of the config files inside the "config" directory. If one did a "make
> > install T=<target>" and then made a modification to the
> > defconfig_<target> file (or applied a patch which modified that file)
> > a subsequent re-run of the make install command would not rebuild the
> > .config file leading to either build failures or an incorrect build.
> > This change fixes that issue.
> 
> Your patch is reverting this one:
> 	mk: in install rule, don't overwrite .config if it already exists
> 	http://dpdk.org/browse/dpdk/commit/?id=1c858a7dfebd4e4092eb55
> As stated in the commit log,
> 	"This allows the user to prepare a configuration with make config
> 	before using make install."
> 
> So your patch is introducing a regression.
> 
> I think you are describing something which is not a bug.
> If you make a modification to the configuration template, you must explicitly
> call "make config".
> 
Ok, thanks for that Thomas. 
However, I still think we have a bug here, or at least we need some discussion on the correct behaviour we expect to have. From my point of view, the new behaviour is problematic, as every time I apply a patch or do a pull, I need to do a "make uninstall" or "make config" before doing "make install" just in case something has changed in the defconfig file, even if I have changed nothing on my end. This is not expected behaviour: if a change is made to the repository, doing a rebuild  should rebuild everything which needs to be built to take account of that change.

Regards,
/Bruce