+
+# Add external project that may want to be built as part of llvm such as Clang,
+# lld, and Polly. This adds two options. One for the source directory of the
+# project, which defaults to ${CMAKE_CURRENT_SOURCE_DIR}/${name}. Another to
+# enable or disable building it with everthing else.
+macro(add_llvm_external_project name)
+ string(TOUPPER ${name} nameUPPER)
+ set(LLVM_EXTERNAL_${nameUPPER}_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/${name}"
+ CACHE PATH "Path to ${name} source directory")
+ if (NOT ${LLVM_EXTERNAL_${nameUPPER}_SOURCE_DIR} STREQUAL ""
+ AND EXISTS ${LLVM_EXTERNAL_${nameUPPER}_SOURCE_DIR}/CMakeLists.txt)
+ option(LLVM_EXTERNAL_${nameUPPER}_BUILD
+ "Whether to build ${name} as part of LLVM" ON)
+ if (LLVM_EXTERNAL_${nameUPPER}_BUILD)
+ add_subdirectory(${LLVM_EXTERNAL_${nameUPPER}_SOURCE_DIR} ${name})
+ endif()
+ endif()
+endmacro(add_llvm_external_project)