[CMake] FIND_PATH issue in FindQt4.cmake

[Harinarayan Krishnan]

Hi All,

Any thoughts on this subject? or should I file a bug report and see what
happens?

Thanks,
Hari


On Tue, Feb 15, 2011 at 10:59 AM, Harinarayan Krishnan <hkrishnan at lbl.gov>wrote:

> Hi All,
>
> I reran my code using cmake 2.8.4rc and still get the same issue where
> FIND_PATH is picking the system directory for QT_CORE over my install
> directory passed through HINTS ${qt_headers}. If this is not related to
> CMAKE_FIND_FRAMEWORK should I file a bug report on this?
>
> Thanks,
> Hari
>
>
> On Tue, Feb 15, 2011 at 10:23 AM, Andreas Pakulat <apaku at gmx.de> wrote:
>
>> On 15.02.11 06:34:07, Harinarayan Krishnan wrote:
>> > Hi All,
>> >
>> > Thanks for the help so far, I will check and see if CMake 2.8.4rc has
>> the
>> > same issue meanwhile I noticed that FIND_PATH seems to have special
>> > instructions for Darwin machines with the use of CMAKE_FIND_FRAMEWORK on
>> > page
>> http://www.cmake.org/cmake/help/cmake-2-8-docs.html#command:find_path
>> >
>> > The notes are a little confusing: it says CMAKE_FIND_FRAMEWORK defaults
>> to
>> > "FIRST" on Darwin systems which I can interpret one of two ways.
>> >
>> > First, If a standard library and a framework are found in the same
>> search
>> > order then CMAKE will use this variable to determine which to pick
>> first.
>> >
>> > Second, if a framework is found regardless of where it is in the search
>> > order it will be picked. I suspect the choice is the first one. However,
>> in
>> > my test I found that if I set CMAKE_FIND_FRAMEWORK to be "LAST" then
>> CMAKE
>> > picks the proper path. This would make me think the second option is at
>> play
>> > or it is just pure coincidence that this option happened to give me the
>> > correct result.
>> >
>> > Any of you know what the correct option is? To me it would make sense
>> that
>> > FIND_PATH honors the search order which would mean that the HINTS option
>> in
>> > FindQt4 should have higher precedence than the Framework in the
>> > CMAKE_SYSTEM_FRAMEWORK_PATH.
>>
>> This cannot be answered without looking at the source code (as its not
>> documented properly) to check what exactly the algorithm does. That is
>> wether it iterates of the individual path in each of the steps and then
>> checks for framework and afterwards for standard headers in that path or
>> if it first checks all paths in a step for frameworks and then again
>> checks all paths for standard headers. Depending on which of the two it
>> is, the outcome of a find_path may depend on the order of the input
>> path-variables (like CMAKE_PREFIX_PATH) or not.
>>
>> Andreas
>>
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