**LLVM_ENABLE_THREADS**:BOOL
Build with threads support, if available. Defaults to ON.
+**LLVM_ENABLE_CXX11**:BOOL
+ Build in C++11 mode, if available. Defaults to OFF.
+
**LLVM_ENABLE_ASSERTIONS**:BOOL
Enables code assertions. Defaults to OFF if and only if ``CMAKE_BUILD_TYPE``
is *Release*.