How to strip trailing whitespace in CMake variable?

Question

We are trying to improve the makefiles produced by CMake. For Clang, GCC and ICC, we want to add -march=native. The block to do so looks like:

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Answer 1

Adding dollar sign and curly braces, ${UNAME_MACHINE}, results in the same original problem (the newline is still present).

If you use curly braces you also need quote marks. EG:

string(STRIP "${UNAME_MACHINE}" UNAME_MACHINE)