Debug build error after Release build

[nolden]

This was reported by a MITK user, see http://bugs.mitk.org/show_bug.cgi?id=9382

Steps to reproduce:

1. Compile release superbuild
2. Compile debug superbuild

You will get a lot of compiler errors like:
-> Error 4 error LNK2038: mismatch detected for '_ITERATOR_DEBUG_LEVEL': value
'0' doesn't match value '2' in ctkCallback.obj
J:\MITK_MSVC2010_X64\MITK_GIT\5>2>Log4Qt.lib(logger.obj)

The problem is that visual studio tries to link a debug version of ctkcore with
a release version of log4qt.

In the cmake config ( J:/MITK_MSVC2010_X64/MITK_GIT/CTK-build/CTK-build ) one
can find the following entry:

LOG4Qt_LIBRARIES =
J:/MITK_MSVC2010_X64/MITK_GIT/CTK-build/Log4Qt-build/bin/Release/Log4Qt.lib

Note the "Release" directory in the pathname!

I think it is because of Log4QtConfig.camke.in. There, "FIND_LIBRARY" is used
as follows:

FIND_LIBRARY(Log4Qt_LIBRARIES Log4Qt
PATHS
"@CMAKE_RUNTIME_OUTPUT_DIRECTORY@/"
"@CMAKE_RUNTIME_OUTPUT_DIRECTORY@/Release"
"@CMAKE_RUNTIME_OUTPUT_DIRECTORY@/Debug"
NO_DEFAULT_PATH
)

I guess that after the library is found in .../Release the path is returned and
used. Thus, if a release version was already build, an error occours if one
tries to compile a debug version.

Workaround until a fix is available:
Manually change "LOG4Qt_LIBRARIES" in the cmake config and manually compile the
hierarchy upwards.