[CMake] Infinite loop with cmake-2.8.10.2

[Jed Brown]

$ echo 'project (Test C)' > CMakeLists.txt
$  cmake -DCMAKE_C_COMPILER:FILEPATH=clang .
-- The C compiler identification is Clang 3.1.0
-- Check for working C compiler: /usr/bin/clang
-- Check for working C compiler: /usr/bin/clang -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Configuring done
-- Generating done
-- Build files have been written to: /tmp/jed/foo

Cool, what happens when we re-run the same command?

$ cmake -DCMAKE_C_COMPILER:FILEPATH=clang .
-- 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_C_COMPILER= clang

-- 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_C_COMPILER= clang

*[infinite loop]*

After this awful behavior, you have to manually delete the CMakeFiles
directory (not CMakeCache.txt) to recover.
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