[CMake] Problem with get_filename_component() and CMAKE_CXX_COMPILER when finding Qt4

[Petr Kmoch]

Hi all.

I'm using CMake 2.8.10.2 to do a Visual Studio 2010 64-bit build, and I
encountered a weird problem with the CMake configure step failing, with the
following output:

CMake Error at C:/Program Files (x86)/CMake
2.8/share/cmake-2.8/Modules/CMakeCXXInformation.cmake:37
(get_filename_component):
  get_filename_component called with incorrect number of arguments
Call Stack (most recent call first):
  CMakeLists.txt:2 (PROJECT)

I managed to pinpoint this to an issue with try_compile in FindQt4. I am
attaching a minimal test case as well as output of cmake --trace. The
CMakeList is just this:

#
cmake_minimum_required(VERSION 2.8.10.2)
project(MyTest C CXX)

find_package(Qt4 COMPONENTS QtCore REQUIRED)
#

The C and CXX compilers are discovered OK, but then the find reports the
error.

I've seen similar errors related to Visual Studio 2010 & 2012 parallel
installs, but the machine has never had 2012 installed on it; it just has
2005 and 2010.

Would anyone have any ideas how to fix this? Thanks in advance for any
pointers.

Petr
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