Re: Optional sub-packages

On 25 May 2012 11:16, Daniel Pfeifer <daniel <at> pfeifer-mail.de> wrote:
> 2012/5/25 Thomas Leonard <talex5 <at> gmail.com>:
>> On May 24, 2012 10:15 PM, "Daniel Pfeifer" <daniel <at> pfeifer-mail.de> wrote:
[...]
>>> What most projects do, is let CMake find the project directory and
>>> check for <project>-<component>.cmake files inside that directory.
>>> This approach fails for 0nstall, because 0install hides each package
>>> in a custom directory.
>>>
>>> Problems:
>>>
>>> * We don't want to lose the package-component relationship, so
>>> providing one <>Config.cmake file per component is not a viable
>>> option.
>>>
>>> * We prefer not to complicate the <>Config.cmake files. It would be
>>> possible to check environment variables inside the config script, but
>>> that may have unwanted side effects when all components are actually
>>> installed to the same directory and some environment variable is set
>>> for some reason.
>>>
>>> * We want to support projects that have not been adapted for 0install.
>>>
>>> I hope that describes our concerns?
>>>
>>> cheers, Daniel
>>>
>>> [*] In C, the header files that represent the interface to a library,
>>> so the develop component usually depends on the binary component. In
>>> C++, this is not necessarily the case: many of our C++ libraries are
>>> header-only for most cases, but provide an optional binary for some
>>> exotic cases.
>>
>> What about having 0compile (or some build wrapper) locate all the project
>> files being used in this build and link/copy them into the "build"
>> directory?
>
> That would mean to copy the complete 0install cache to another layout
> in most cases.

Does that mean that all the component's files have to be in the same
directory as the .cmake file? i.e. you can't have a build/foo.cmake
that just points at the real one?

Also, how does it handle the common case where you have
distribution-provided files in /usr, site-local packages installed to
/usr/local, /opt/*, and user packages in $HOME?

Doesn't cmake have some kind of search path (like $PKG_CONFIG_PATH)?

--

-- 
Dr Thomas Leonard        http://0install.net/
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