Compiler-rt for Hexagon

Hello All,

I was trying to build Compiler-rt for Hexagon target but I was not
able to build.
By default it is getting built for x86 target even after specifying
DLLVM_TARGETS_TO_BUILD="Hexagon".

Here are the cmake messages:
-- Compiler-RT supported architectures: x86_64;i386
-- Performing Test COMPILER_RT_HAS_VISIBILITY_HIDDEN_FLAG
-- Performing Test COMPILER_RT_HAS_VISIBILITY_HIDDEN_FLAG - Success
-- Performing Test COMPILER_RT_HAS_OMIT_FRAME_POINTER_FLAG
-- Performing Test COMPILER_RT_HAS_OMIT_FRAME_POINTER_FLAG - Success
-- Performing Test COMPILER_RT_HAS_FREESTANDING_FLAG
-- Performing Test COMPILER_RT_HAS_FREESTANDING_FLAG - Success
-- Performing Test COMPILER_RT_HAS_XRAY_COMPILER_FLAG
-- Performing Test COMPILER_RT_HAS_XRAY_COMPILER_FLAG - Failed
-- Performing Test COMPILER_RT_HAS_ATOMIC_KEYWORD
-- Performing Test COMPILER_RT_HAS_ATOMIC_KEYWORD - Success
-- Builtin supported architectures: i386;x86_64

Please let me know how to proceed.

Thanks
Nagaraju