[CMake] Getting the source file list for an executable fails

[Campbell Barton]

Hi, I would expect this would work from reading the docs but it gives

	add_executable(mytarget ${SRC})
	get_property(TESTPROP_A TARGET mytarget PROPERTY SOURCE)
        get_target_property(TESTPROP_B mytarget SOURCE)
	message(FATAL_ERROR "Testing ${TESTPROP_A}, ${TESTPROP_B}")

The output I get is:

Testing '', 'TESTPROP_B-NOTFOUND'

This is odd since properties "TYPE" and "LOCATION" are found

Obviously in this case ${SRC} is already available, but I'm just
trying to figure out why it fails.

tested on cmake 2.8.5

-- 
- Campbell