oddly, in the current YP kernel dev manual, i don't see the phrase "is not set" explained anywhere in the entire doc, which is weird since it seems like it would be important.
first, just to confirm *i* know what it's used for, it's not just a comment -- it's used explicitly by the kernel config process to stipulate that we are aware of a kernel config setting, and we don't want it. that is, if we have a kernel .config file used as the basis of a "make *config" command, and there is no mention whatever of a reachable config variable, the config process will stop and ask us about it. am i right so far? this means that, once the kernel config process completes and the .config file is generated, every single *available* and *settable* kernel config option should be listed in the .config file, to avoid being asked about it the next time we do a kernel configuration. oh, and about that "reachable" thing, we don't need a line regarding every single kernel config setting, just the ones that are available to be set given the current config settings. how am i doing so far? given all that, my understanding is that, when one is writing kernel config fragments, it is necessary to explicitly deselect ("# ... is not set") *only* those kernel config options that would be selected based on other config settings we selected. do i have that right? for instance, here's kernel Kbuild file net/Kconfig: ... menuconfig NETFILTER bool "Network packet filtering framework (Netfilter)" ... snip ... if NETFILTER config NETFILTER_DEBUG bool "Network packet filtering debugging" depends on NETFILTER help You can say Y here if you want to get additional messages useful in debugging the netfilter code. as a test, i added a single-line frgament file: CONFIG_NETFILTER=y however, even though NETFILTER_DEBUG was then selectable, because it wasn't *explicitly* selected, what i got in my final .config file was: ... CONFIG_NETFILTER=y # CONFIG_NETFILTER_DEBUG is not set ... however, because the very next Kconfig stanza was "default y": config NETFILTER_ADVANCED bool "Advanced netfilter configuration" depends on NETFILTER default y i *did* get the line in the final .config: CONFIG_NETFILTER_ADVANCED=y does all this sound right? i always thought it was pretty straightforward, but i'm willing to be convinced i never really understood it. and it does seem odd that it's not described anywhere in the YP kernel dev manual. rday -- ======================================================================== Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday ======================================================================== -- _______________________________________________ Openembedded-core mailing list Openembedded-core@lists.openembedded.org http://lists.openembedded.org/mailman/listinfo/openembedded-core