[CMake] EXTERNALPROJECT_ADD and AlwaysCreate

[David Cole]

Using:

  UPDATE_COMMAND ""

is perfectly correct, and is working as intended.

You should see text like this in your output, which verifies that
UPDATE_COMMAND "" is working:
1>  No update step for 'SAF-ext'
1>  No patch step for 'SAF-ext'

However, this seems to be some sort of "Visual Studio 10"-only problem... I
have reproduced your problem with Visual Studio 10, but do not see the same
problem when using Visual Studio 9.

Attached to this new bug regarding this thread is a smaller project (smaller
than ITK == not hard to do) that demonstrates the issue if anybody else
wants to try it out:

  http://public.kitware.com/Bug/view.php?id=11927


Thanks for the report,
David


On Fri, Mar 4, 2011 at 4:06 AM, Yves Martelli <ymartelli at cistib.upf.edu>wrote:

> Dear All,
>
> Sorry to repost but I am still stuck with this, would anyone have
> suggestions? Anyone had the same experience with the UPDATE_COMMAND not
> working?
>
> Thanks,
>
> Yves
>
>
>
> *From:* Yves Martelli
> *Sent:* lunes, 21 de febrero de 2011 15:00
> *To:* 'cmake at cmake.org'
> *Subject:* EXTERNALPROJECT_ADD and AlwaysCreate
>
>
>
> Dear All,
>
> I’m trying to use the ExternalProject functionality. I'm under Microsoft
> Windows 7 and using Microsoft Visual Studio 2010 with CMake 2.8.4. It's a
> simple test, trying to compile some classes that need ITK, so I have an:
>
>
>
>     EXTERNALPROJECT_ADD(
>
>         ITK-ext
>
>         GIT_REPOSITORY "http://itk.org/ITK.git"
>
>         GIT_TAG "v3.20.0"
>
>         CMAKE_ARGS
>
>             -DBUILD_SHARED_LIBS:BOOL=ON
>
>             -DBUILD_TESTING:BOOL=OFF
>
>             -DBUILD_EXAMPLES:BOOL=OFF
>
>             -DITK_USE_OPTIMIZED_REGISTRATION_METHODS:BOOL=ON
>
>             -DITK_USE_REVIEW:BOOL=ON
>
>         INSTALL_COMMAND ""
>
>         UPDATE_COMMAND ""
>
>     )
>
>
>
> My problem is that it works fine the first time (download and compile ITK
> and my project). But every time after, when I build, it tries to download
> ITK again, which I do not want (only the first time is enough). The output
> of visual studio is:
>
>
>
> 1>------ Build started: Project: ITK-ext, Configuration: Debug x64 ------
>
> 1>Build started 21/02/2011 14:31:54.
>
> 1>InitializeBuildStatus:
>
> 1>  Creating "x64\Debug\ITK-ext\ITK-ext.unsuccessfulbuild" because
> "AlwaysCreate" was specified.
>
> 1>CustomBuild:
>
> 1>  Creating directories for 'ITK-ext'
>
> 1>  Performing download step (git clone) for 'ITK-ext'
>
> ...
>
>
>
> I thought that the UPDATE_COMMAND "" would solve this but it does not. Can
> I deactivate this "AlwaysCreate"?
>
>
>
> Thanks,
> Yves
>
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