On 12:24 Tue 05 Oct , matt mooney wrote: > On 16:29 Tue 05 Oct , Sam Ravnborg wrote: > > On Sun, Sep 26, 2010 at 02:00:47PM -0700, matt mooney wrote: > > > I have been doing cleanup of makefiles, namely replacing the older style > > > compilation flag variables with the newer style. While doing this, I > > > noticed that the majority of drivers in the media subsystem seem to rely > > > on a few core header files: > > > > > > -Idrivers/media/video > > > -Idrivers/media/common/tuners > > > -Idrivers/media/dvb/dvb-core > > > -Idrivers/media/dvb/frontends > > > > > > This patch removes them from the individual makefiles and puts them in > > > the main makefile under media. > > Using subdir-ccflags-y has one drawback you need to be aware of. > > The variable is _not_ picked up if you build individual drivers like > > this: > > > > > > make drivers/media/dvb/b2c2/ > > > > So with this patch applied it is no longer possible to do so. > > It is better to accept the duplication rather than breaking > > the build of individual drivers. > > Ah, I was not aware of that, and I forgot to test for that case. > > > > > > > If neither idea is considered beneficial, I will go ahead and replace > > > the older variables with the newer ones as is. > > > > This is the right approach. > > > > You could consider to do a more general cleanup: > > 1) replace EXTRA_CFLAGS with ccflags-y (the one you suggest) > > 2) replace use of <module>-objs with <module>-y > > 3) break continued lines into several assignments > > People very often uses '\' to break long lines, where a > > simple += would be much more readable. > > But this topic may be personal - I never uses "\" in my .c code unless in macros, > > and I have applied the same rule for Makefiles. > > An ugly example is drivers/media/Makefile > > 4) In general use ":=" instead of "=". > > Add using "+=" as first assignment is OK - but it just looks plain wrong > > 5) some files has a mixture of spaces/tabs (are red in my vim) > > dvb-core/Makefile is one such example > > 6) remove useless stuff > > siano/Makefile has some strange assignments to EXTRA_CFLAGS > > 7) Likely a few more items to look after... > > > > This is more work - but then you finish a Makefile rather than doing a simple > > conversion. > > I agree with all your points above; however, I was unsure of whether a wholesale > cleanup would be welcomed because I would then end up touching numerous lines > (and in some cases, possibly all lines). I did notice, though, the need for > quite a bit of cleanup like you have mentioned, and I have a few patches queued > up that make a second pass on some files changing <module>-objs to > <module>-y. You know better than I do, so if you feel I should cleanup the whole > file in one patch, then that is what I will do although this will take some > time. > > Is the use of <module>-objs deprecated? Some people might wonder why I am > changing that when they are not building a multisource object. I just realized I stated that wrong. I meant when they are not using a conditional inclusion of sources. Thanks, mfm -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
