[OpenWrt-Devel] Unintended consequence of building all profiles for a target

Daniel Dickinson openwrt at daniel.thecshore.com
Sun Jan 17 15:28:33 EST 2016

Hi all,

I have noticed an unintended consequence of building all profiles for a 
single target at once: All profiles get all packages marked as 'y' as a 
consquence of dependencies of *any* profile being built.

This is true even before the code I'm doing to build multiple profiles 
and is a consequence of the way package selection works.  Because select 
<package> selects a package as y even if it only needed for one image, 
it becomes y for all images being built at the same time!

While I don't think there are any cases where that causes fatal negative 
consequences it is perhaps somewhat surprising and unexpected (and in 
the brcm47xx results is bloated images when built as a group).

The offending code is in package/Makefile:

         $(foreach pkg,$(sort $(package-y)), \
                 $(foreach variant, \
                         $(if $(strip $(package/$(pkg)/variants)), \
                                 $(package/$(pkg)/variants), \
                                 $(if $(package/$(pkg)/default-variant), \

$(package/$(pkg)/default-variant), \
                                         default \
                                 ) \
                         ), \
                         $(PKG_INFO_DIR)/$(lastword $(subst 
/,$(space),$(pkg))).$(variant).install \
                 ) \

Unfortunately solving this problem is non-trivial, especially since 
there is no easy way to disinguish between auto-y and intended-y or what 
would be intended of there were not auto.


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