CMAKE: fixed cflags check for build type Martin Gerhardy wrote: If there is a variable named test, then cmake does variable-value comparison: if (test STREQUAL "") is equivalent to: if ("${test}" STREQUAL "") If there is no variable named test, then cmake does string literal comparison: if (test STREQUAL "") is equivalent to: if ("test" STREQUAL "") That means basically - the current stuff works - but is not how it should be done. Fixes https://github.com/libsdl-org/SDL/issues/2100