[CMake] Meaning of CTEST_ENVIRONMENT

[NoRulez]

Hello,

in an example i saw that CTEST_ENVIRONMENT is used to set specific paths.
I tried the same in my CTestScript, but this doesn't work. Can anybody explain me why variant 1 is working and variant 2 is not?

1.Variant:
set(ENV{QTDIR} "C:\\Qt")
set(ENV{PATH} "$ENV{QTDIR};$ENV{QTDIR}\\bin;$ENV{PATH}")

2.Variant:
set(CTEST_ENVIRONMENT "QTDIR=C:\\Qt"
                      "PATH=%QTDIR%\;%QTDIR%\\bin\;%PATH%"
)

Thanks in advance

Best Regards
NoRulez
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