Make kernel config options available to module load, and use them to solve some problems.

[imp]

Summary

Populate new KERN_OPTS from all the opt_*.h files in
KERNBUILDDIR. Come up with some sensible defaults (though listing them
in kmod.mk may be unwise -- we have no easy way to know what are the
best sensible defaults for everything so we just catch.the big stuff).
Append SRCS.${opt} for each option in KERN_OPTS to SRCS to allow easy
conditional compilation. Append any notion of KERN_OPTS_EXTRA to the
list of kernel opts.

Use this feature to clean up INET, INTE6, EISA stuff in the tree, as
well as enhance the ed module to be more flexible as an example.

[adrian]

Hm, gotta be careful with IEEE80211_DEBUG - it changes the API and modules don't load. :(

[imp]

I just listed the ones already in kmod.mk

[jhb]

I like the concept certainly. I would probably vote for committing the infrastructure as one change and then using followups for cleanups and adding more uses of SRCS.<foo>

sys/conf/options

400 ↗

(On Diff #3187)

Might as well put this in opt_pci.h instead of opt_global.h? (I.e. I would err on not putting things in opt_global.h if possible)

sys/modules/ep/Makefile

15 ↗

(On Diff #3187)

Perhaps leave the commented out mca line for now. Removing that probably warrants being done in a separate commit?

sys/modules/if_gif/Makefile

14 ↗

(On Diff #3187)

You can't use SRCS.INET here?

sys/modules/si/Makefile

9 ↗

(On Diff #3187)

Seems like we should be making use of SRCS.DEV_ISA and SRCS.DEV_PCI as well?

[imp]

Closed by commit rS278958 (authored by @imp).