Running configure specifically for apidox

[Adriaan de Groot]

The attached patch adds a configure option "--enable-apidox" (not _really_ a 
good name, since it's more like "--enable-ignore-do-not-compile-for-apidox" 
or "--disable-no-compile"). The purpose here is to make it possible to build 
apidox for an entire module _even without the dependencies_ that would 
otherwise cause parts of the apidox to be omitted. It does this by just 
zeroing out the DO_NOT_COMPILE before writing out the (TOP)SUBDIRS.

Consider ktown. It doesn't have pilot-link installed, so KPilot ends up in 
DO_NOT_COMPILE; as a consequence the apidox for KPilot aren't built there 
either since the apidox targer uses SUBDIRS which is generated by subtracting 
DO_NOT_COMPILE from the available subdirs. This is kind of inconvenient when 
the apidox on ktown are supposed to be complete.

One problem I can see with this patch is that it is _possible_ to configure 
with --enable-apidox and then run "make" and have the build fail because of 
something that would otherwise be DO_NOT_COMPILE. I don't see how to make the 
"all" target after such a configure point to apidox instead of the all-am, 
though. Hints?

Is this OK to commit? Renaming is fine by me, I'd probably go with 
--disable-no-compile in the commit version. It'd improve some of the apidox 
immediately (consider again, hosting apidox on ktown or some other server 
without every possible dependency of each module installed).

-- 
These are your friends - Adem
    GPG: FEA2 A3FE Adriaan de Groot
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