[CMake] Usage of export(PACKAGE ...)

[David Cole]

If <PROJECT_NAME>_DIR is given and has a correct value, it is a bug if 
find_package finds the project anywhere else. Whether that's generally 
true or not, I sort of doubt it. It probably depends on the project 
itself, and the find and/or config files involved.

I second Stephen's request for steps to reproduce.

If it's true, it's a bug that should be fixed, not something where we 
should deprecate export(PACKAGE or add warnings...


Just my opinion,
David C.




-----Original Message-----
From: Stephen Kelly <steveire at gmail.com>
To: cmake <cmake at cmake.org>
Sent: Thu, Mar 28, 2013 5:12 pm
Subject: Re: [CMake] Usage of export(PACKAGE ...)


Jean-Christophe Fillion-Robin wrote:

> Hi Folks,
>
> I would like to discussed the usable of "export(PACKAGE ...)" 
statement.
>
> Based on my experience, it turns out that exporting the build tree in 
the
> system package registry is a bad idea when building the same package
> multiple time as it is done on a dashboard client or a developer
> workstation trying out multiple configurations. Indeed, when
> "find_package" is used in "CONFIG" (or "NO_MODULE") mode, by default 
CMake
> will search into the CMAKE_SYSTEM_PACKAGE_REGISTRY and will resolve 
to an
> already generated build tree instead of the one passed using
> <PROJECT_NAME>_DIR.
>
> What do you think ? Should we deprecate the use of "export(PACKAGE 
..)" or
> add a warning in the documentation ?
>
> Reference:
> http://www.cmake.org/cmake/help/v2.8.10/cmake.html#command:export
>

I filed http://public.kitware.com/Bug/view.php?id=13747 about this some 
time
ago, but I haven't tried to reproduce it since, and I don't have a 
testplan
for it. Could you describe a reliable way to reproduce the problem?

Thanks,

Steve.


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