"debug mode" for config(1)

[Paul Goyette <paul%whooppee.com@localhost>]

Is there a "debug" mode available for config?

I would like to know why a particular source file is being included in 
my kernel.  :)

The file in question is net/zlib.c and the only reference I can locate 
for this file is in sys/conf/files

file    net/zlib.c     (ppp & ppp_deflate) | opencrypto | vnd_compression

As I understand the configuration syntax, this means that the file is 
required when any of the other "conditions" are included in the kernel.

I don't have ppp or vnd in this kernel, and I can't seem to find any 
other component that would reference opencrypto.  I've searched through 
all of the "files", "files.*", "std", and "std.*" files within src/sys 
and nothing appears to bring in opencrypto.  (The only one that looked 
even remotely relevant was sys/netipsec/files.netipsec but I do not have 
IPSEC in this kernel, either.)

Yet, net/zlib and all the other opencrypto objects are part of the 
compiled kernel.

So, how do I find out why net/zlib is included in the kernel?


Why do I care, if everything works?  Well, VND_COMPRESSION is defined 
when building src/sys/modules/vnd/ and that appears to require access to 
the stuff in net/zlib.c.  But net/zlib.c is not linked as part of the 
module, so loading the module would/should fail if the appropriate 
symbols/routines are not available in the kernel.  So it would seem that 
some mechanism needs to exist to ensure that the zlib stuff can be made 
available, perhaps as a separate module (similar to the way that the 
dev/dksubr.c stuff is now available for use in the vnd, cgd, and ccd 
modules).



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