On Fri, Sep 24, 2010 at 11:57:56PM -0700, Guy Harris wrote:
> Is it just me, or is CMake's "option" command of limited use?
It is a bit different, the rest is how I set the defaults, see below.
> For one thing, there appears to be no way to specify an option on the command
> line, unlike with autoconf, where you can specify --enable-XXX or
> --disable-XXX, or specify --withXXX with or without a value or specify
> --without=XXX?
Acutally, you can. You can override the defaults by running
cmake -DENABLE_CAP=ON/OFF
> For another thing, they appear to be purely Boolean - there's no way to have
> the default value for "with XXX" be "yeah, if XXX is available", with the
> user able to select "with XXX, and, if XXX isn't available, fail the
> configuration" or "without XXX, even if it's available"?
That's mostly true, but it should be doable: Right now, I collect a list of
packages to check for and then check them as REQUIRED, so things fail of course.
I should be able to add another value in addition to just ON/OFF like OPT(ional)
and not set the REQUIRED keyword in that case.
> The default behavior for, for example, libcap should be "use it if it's
> available, don't use it if it's not", so that on non-Linux systems (which
> probably don't have libcap), it Just Works, and for Linux systems that lack
> libcap, it Just Works (by not building with libcap), and, for Linux systems
> that have libcap, it Just Works (by building with libcap). It might be nice
> to allow the user to override that, but, if CMake doesn't make that easy, I'm
> inclined to make the default behavior the only available behavior (by
> explicitly setting CAP_OPTIONS to an empty string, so that REQUIRED is *NOT*
> one of the option).
Yes, that would be another solution, but being able to specifiy the stuff on the
command line might be another option.
If the ENABLE_feature way sounds OK, I'd go ahead and implement it. Just
let me know.
ciao
Joerg
--
Joerg Mayer <[email protected]>
We are stuck with technology when what we really want is just stuff that
works. Some say that should read Microsoft instead of technology.
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