Paulo Jorge Guedes wrote:
>> -----Original Message-----
>> From: Paulo Jorge Guedes [mailto:[EMAIL PROTECTED]
>> Sent: terça-feira, 20 de Junho de 2006 19:16
>> To: [email protected]
>> Subject: RE: Suggested patch for FindOpenGL.cmake
>>
>>> -----Original Message-----
>>> From: David Faure [mailto:[EMAIL PROTECTED]
>>> Sent: terça-feira, 20 de Junho de 2006 9:27
>>> To: [email protected]
>>> Subject: Re: Suggested patch for FindOpenGL.cmake
>>>
>>> On Monday 19 June 2006 22:12, Alexander Neundorf wrote:
>>>> On Monday 19 June 2006 00:14, David Faure wrote:
>>>>> Why look for X11 again, if we did so already before?
>>>>> [e.g. due to FindQt4.cmake]
>>>>> This should save a bit of time in reconfiguring, since FindX11 has a
>>> rather
>>>>> large set of checks (it's even larger in kde's version of it, due to
>>>>> additional libs), and since FindX11 doesn't have a fast path when
>>> things
>>>>> are in the cache already (it rechecks every time).
>>>> Does this have a measurable effect ?
>>> It has at least the effect that I dont see "Xpm not found" 4 times in
>>> kdebase :)
>>>
>>>> Detecting the stuff (the find_xxx() calls) automatically uses the
>> cache.
>>> Take a look at our FindX11.cmake - there is a lot going on there, not
>> just
>>> find_xxx.
>> I think this is screaming to be automated. It would be great if cmake
>> could offer some mechanism to do this checking automatically.
>> Perhaps some list where we could add the variables that would define if
>> the checking for a particular module is completed, e.g.:
>>
>> FindX11.cmake:
>>
>> set_required_vars(X11_FOUND)
>>
>> Then, cmake would automatically check the required vars at the beginning
>> of each module and would return if they were satisfied, and the user could
>> happily try to find the packages without worrying about performance or
>> output.
>>
>> What do you think?
> 
> Maybe this could be even easier. 
> It seems to be a standard to define a variable named "FOOBAR_FOUND" for a 
> "FindFoobar.cmake" module. This means that "FOOBAR_FOUND" could be 
> automatically added to the required variable list so that, in the majority of 
> the cases, the user shouldn't have to write any code at all (if he follows 
> this standard).

FindOpenGL.cmake could use the line

   FIND_PACKAGE(X11)

to look for the X11 package.  We could add a short-cut in FIND_PACKAGE 
to skip doing anything if X11_FOUND is already set to true.  Does this 
do what you want?

-Brad
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