Re: [cmake-developers] CMake "find_package" command on a package that is not installed is unexpectedly successful

2019-02-05 Thread Timothy Wrona
Is there an easy way to clean the user package registry (with a CMake
command or something similar) instead of manually making edits to the
Windows registry?

After moving this package around a few times I've realized I have a bunch
of junk entries in the user package registry.

On Tue, Feb 5, 2019 at 3:15 PM Timothy Wrona  wrote:

> Thank you! I didn't know it would make a registry entry, that was the
> missing link!
>
> On Tue, Feb 5, 2019 at 2:46 PM Brad King  wrote:
>
>> On 2/5/19 2:37 PM, Timothy Wrona wrote:
>> > Can anyone explain to me how "find_package" is able to find the Eigen
>> libraries
>> > even though they are just pasted into some arbitrary location that I
>> never told
>> > the example project about?
>>
>> Eigen uses the CMake package registry feature:
>>
>>
>> https://bitbucket.org/eigen/eigen/src/a3be57987f/CMakeLists.txt?at=default=file-view-default#CMakeLists.txt-602:604
>>
>> See docs here:
>>
>>
>> https://cmake.org/cmake/help/v3.13/manual/cmake-packages.7.html#package-registry
>>
>> and step 6 of the find_package search procedure:
>>
>>
>> https://cmake.org/cmake/help/v3.13/command/find_package.html#search-procedure
>>
>> -Brad
>>
>
-- 

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Re: [cmake-developers] CMake "find_package" command on a package that is not installed is unexpectedly successful

2019-02-05 Thread Timothy Wrona
Thank you! I didn't know it would make a registry entry, that was the
missing link!

On Tue, Feb 5, 2019 at 2:46 PM Brad King  wrote:

> On 2/5/19 2:37 PM, Timothy Wrona wrote:
> > Can anyone explain to me how "find_package" is able to find the Eigen
> libraries
> > even though they are just pasted into some arbitrary location that I
> never told
> > the example project about?
>
> Eigen uses the CMake package registry feature:
>
>
> https://bitbucket.org/eigen/eigen/src/a3be57987f/CMakeLists.txt?at=default=file-view-default#CMakeLists.txt-602:604
>
> See docs here:
>
>
> https://cmake.org/cmake/help/v3.13/manual/cmake-packages.7.html#package-registry
>
> and step 6 of the find_package search procedure:
>
>
> https://cmake.org/cmake/help/v3.13/command/find_package.html#search-procedure
>
> -Brad
>
-- 

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Re: [cmake-developers] CMake "find_package" command on a package that is not installed is unexpectedly successful

2019-02-05 Thread Brad King via cmake-developers
On 2/5/19 2:37 PM, Timothy Wrona wrote:
> Can anyone explain to me how "find_package" is able to find the Eigen 
> libraries
> even though they are just pasted into some arbitrary location that I never 
> told
> the example project about?

Eigen uses the CMake package registry feature:

  
https://bitbucket.org/eigen/eigen/src/a3be57987f/CMakeLists.txt?at=default=file-view-default#CMakeLists.txt-602:604

See docs here:

  
https://cmake.org/cmake/help/v3.13/manual/cmake-packages.7.html#package-registry

and step 6 of the find_package search procedure:

  https://cmake.org/cmake/help/v3.13/command/find_package.html#search-procedure

-Brad
-- 

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[cmake-developers] CMake "find_package" command on a package that is not installed is unexpectedly successful

2019-02-05 Thread Timothy Wrona
I am working my way through the "CMake Cookbook" by Radovan Bast and
Roberto Di Remigio and got to an example that required the Eigen C++
libraries. (chapter-02/recipe-06)

I downloaded the ".zip" for the Eigen libraries and unzipped it to an
arbitrary location. Then I ran CMake on it (but I did not build or install
it). After doing this, magically the example code was able to find it and
the example built successfully even though I never told it where to look
for the Eigen libraries.

A detailed description of my experience is in this stack overflow post:
https://stackoverflow.com/questions/54541261/cmake-find-package-command-on-a-package-that-was-not-installed-is-unexpectedly?noredirect=1#comment95884208_54541261

Can anyone explain to me how "find_package" is able to find the Eigen
libraries even though they are just pasted into some arbitrary location
that I never told the example project about?

As far as I can tell from the documentation on "find_package" it should not
work.

Thanks,
Tim
-- 

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