TODO
+The most difficult part of adding LLVM to the build of a project + is to determine the set of LLVM libraries corresponding to the set + of required LLVM features. What follows is an example of how to + obtain this information:
+ +
+ # A convenience variable:
+ set(LLVM_ROOT "" CACHE PATH "Root of LLVM install.")
+ # A bit of a sanity check:
+ if( NOT EXISTS ${LLVM_ROOT}/include/llvm )
+ message(FATAL_ERROR "LLVM_ROOT (${LLVM_ROOT}) is not a valid LLVM install")
+ endif()
+ # We incorporate the CMake features provided by LLVM:
+ set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${LLVM_ROOT}/share/llvm/cmake")
+ include(LLVM)
+ # Now set the header and library paths:
+ include_directories( ${LLVM_ROOT}/include )
+ link_directories( ${LLVM_ROOT}/lib )
+ # Let's suppose we want to build a JIT compiler with support for
+ # binary code (no interpreter):
+ llvm_map_components_to_libraries(REQ_LLVM_LIBRARIES jit native)
+ # Finally, we link the LLVM libraries to our executable:
+ target_link_libraries(mycompiler ${REQ_LLVM_LIBRARIES})
+
+ This assumes that LLVM_ROOT points to an install of LLVM. The + procedure works too for uninstalled builds although we need to take + care to add an include_directories for the location of the + headers on the LLVM source directory (if we are building + out-of-source.)