[CMake] problems with cache and findvtk

[Dominik Szczerba]

No, I do not have any cache files in the whole source tree.

The easiest - and the most suspicious - way to reproduce is:

1) cmake -C ~/src/mesh/CMakeInitialCache-x60.cmake ~/src/mesh
(this configures correctly, values from the cache are taken, I see them
displayed with MESSAGE. Now "make whatever" would work as expected.
2) ccmake .
(just this, no reconfigure, no re-generate, just run and quit)
3) cmake -C ~/src/mesh/CMakeInitialCache-x60.cmake ~/src/mesh
This now does not work anymore. Some snippets from the output:

loading initial cache
file /home/domel/src/mesh/CMakeInitialCache-x60.cmake
(...)
-- IDIR_HDF5: /home/domel/pack/hdf5-1.8.3/src (several variables *ARE*
correctly there
(...)
Warning: CMake is forcing CMAKE_CXX_COMPILER to "/usr/bin/c++" to match
that imported from VTK.  This is required because C++ projects must use
the same compiler.  If this message appears for more than one imported
project, you have conflicting C++ compilers and will have to re-build
one of those projects. Was set to /usr/bin/g++
(...)
-- IMESH: QT_QMAKE_EXECUTABLE: /usr/bin/qmake (still several more
variables are OK)
(...)
-- Configuring done
You have changed variables that require your cache to be deleted.
Configure will be re-run and you may have to reset some variables.
The following variables have changed:
CMAKE_CXX_COMPILER= /usr/bin/c++
(so the cache is deleted!!! why??? Now the configuration re-starts and
ALL variables are gone:)
-- IDIR_HDF5: (empty...)

CMake Error at /usr/local/share/cmake-2.6/Modules/FindVTK.cmake:134
(MESSAGE):
  VTK not found.  Set the VTK_DIR cmake cache entry to the directory
  containing VTKConfig.cmake.  This is either the root of the build
tree, or
  PREFIX/lib/vtk for an installation.  For VTK 4.0, this is the location
of
  UseVTK.cmake.  This is either the root of the build tree or
  PREFIX/include/vtk for an installation.
Call Stack (most recent call first):
  CMakeLists.txt:80 (FIND_PACKAGE)


Any ideas why no action whatsoever causes the failure?
Many thanks!
-- Dominik

On Thu, 2009-07-23 at 06:57 -0400, David Cole wrote:
> Something's not right... This should work.
> 
> Is there a CMakeCache.txt file in the source tree? If so, delete it
> and start with a clean source tree.
> 
> Are you getting configure errors?
> 
> Steps to reproduce the issue might help to diagnose the problem.
> 
> 
> 
> On Thu, Jul 23, 2009 at 6:22 AM, Dominik Szczerba
> <dominik at itis.ethz.ch> wrote:
>         Some moredebugging info: cmake versions 2.6.2 and 2.6.4. Re:
>         point 2)
>         running cmake -C path/to/initcache.cmake PATH does NOT resolve
>         the
>         problem.
>         
>         Is it a bug case or expected bahvior?
>         
>         Dominik
>         
>         
>         On Thu, 2009-07-23 at 10:33 +0200, Dominik Szczerba wrote:
>         > Hi,
>         > I have several frustrating problems using cmake initial
>         cache file with
>         > some variables in combination with using findvtk in my
>         CMakeLists.txt.
>         >
>         > 1) ccmake . in the build dir invalidates the whole dir:
>         findvtk
>         > complains about missing VTK_Dir, which *WAS* in the initial
>         cache. I
>         > have to delete the whole tree and run cmake -C
>         path/to/initcache.cmake
>         > PATH again
>         >
>         > 2) indentical symptoms are when CMakeLists.txt has changed:
>         VTK_DIR and
>         > CMAKE_BUILD_TYPE are not there.
>         >
>         > How to resolve it?
>         >
>         > Dominik
>         >
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