[CMake] get_file_name_component - how to return true extension

[Brian Davis]

for a given file of the form:

openssl-0.9.8a.tar.gz

I call as an example:

 get_filename_component( TAR_EXT openssl-0.9.8a.tar.gz EXT )

and I get for TAR_EXT

.9.1.tar.gz

Which is not quite what I was expecting.

I was expecting .gz and with successive calls I would get  .tar

Is there a mechanism in CMake for getting the trailing extension?

-- 
Brian J. Davis
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