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This patch fixes a few CMake options that were set using incorrect mechanisms. CMake's man page for the -D <var>=<value> option states: If a command in the project sets the type to PATH or FILEPATH, then the <value> will be converted to an absolute path. That's not what we want for most of the paths we have as configuration options. Otherwise, using -D to set the configuration option results in an absolute path being used, which breaks things. option() denotes a boolean variable, but what was desired was a string/list variable. Fix this to prevent cmake from changing any non-empty user provided values to 'ON'. Differential Revision: https://reviews.llvm.org/D157926 (cherry picked from commit 760261a3daf98882ccbd177e3133fb4a058f47ad)