POCO: can not set the postfix

[zhang-qiang-github]

@ChrisJaquet

The file poco/DefinePlatformSpecifc.cmake at master · pocoproject/poco · GitHub seems to override the cached values:

Is that means that the changing in CMake GUI is useless?

If I want to set the CMAKE_RELWITHDEBINFO_POSTFIX as “rd”, should I change the DefinePlatformSpecifc.cmake rather than change the CMake GUI?