[CMake] CMP0054 and CMake Modules

[thoni56]

Also, this does not happen on MacOSX with Macports cmake. But does on Cygwin.
thoni56 wrote
> 
> Nils Gladitz-2 wrote
>> On 09/21/2015 09:37 AM, thoni56 wrote:
>>>    Quoted variables like "" will no longer be dereferenced when the
>>> policy is
>> 
>> You apparently have a variable whose name is the empty string.
>> 
>> ...
>> 
>> Since most cmake provided modules have to work with both the old and new 
>> behavior a common work around is e.g.
>> 
>> 	if("x${MYVAR}" STREQUAL "x")
>> 
>> This workaround however only works if by convention there are no 
>> variables starting with a lower case x in their name.
>> 
>> I think by that same reasoning you should avoid defining variables whose 
>> name is the empty string.
>> 
>> Nils
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