-snip- I do not think that this is necessary. CMake should overwrite the according values. -end snip-
IMHO clearing the cache and starting from scratch is the best approach if you are developing the build spec and not simply compiling 3rdParty source as the CACHE may contain variables you created used, deleted, and forgot to change their use.... there are in my experience *VERY* good reasons for deleting the Cache. I am a new user of CMake so take this with a grain of salt ... and some paprika... for flavor. B
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