[CMake] [PATCH] support for CTEST_INITIAL_CACHE in new-style ctest script

[Alexander Neundorf]

Hi,

the attached patch adds support for the CTEST_INITIAL_CACHE variable when 
using new-style ctest commands.
Now ctest_configure() checks the CTEST_INITIAL_CACHE variable and if it is not 
empty, AND there is no CMakeCache.txt yet, it writes the initial 
CMakeCache.txt
I had a look at the code of the old-style ctest script, it seems there any 
existing CMakeCache.txt is overwritten if CTEST_INITIAL_CACHE is set. Is this 
correct ? Is this behaviour also wanted for the new-style commands ?
I think it is not necessary, because if I want to have a fresh cmake run, I 
can use ctest_empty_binary_directory() before, then I will also get the 
initial cache again.

What do you think ?
Ok to commit ?

Alex
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