1 # This file handles building LLVM runtime sub-projects. 2 3 # Runtimes are different from tools or other drop-in projects because runtimes 4 # should be built with the LLVM toolchain from the build directory. This file is 5 # a first step to formalizing runtime build interfaces. 6 7 # In the current state this file only works with compiler-rt, other runtimes 8 # will work as the runtime build interface standardizes. 9 10 # Find all subdirectories containing CMake projects 11 file(GLOB entries *) 12 foreach(entry ${entries}) 13 if(IS_DIRECTORY ${entry} AND EXISTS ${entry}/CMakeLists.txt) 14 list(APPEND runtimes ${entry}) 15 endif() 16 endforeach() 17 18 # If this file is acting as a top-level CMake invocation, this code path is 19 # triggered by the external project call for the runtimes target below. 20 if(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_CURRENT_SOURCE_DIR}) 21 22 cmake_minimum_required(VERSION 3.4.3) 23 24 # Add the root project's CMake modules, and the LLVM build's modules to the 25 # CMake module path. 26 list(INSERT CMAKE_MODULE_PATH 0 27 "${CMAKE_CURRENT_SOURCE_DIR}/../cmake" 28 "${CMAKE_CURRENT_SOURCE_DIR}/../cmake/Modules" 29 "${LLVM_BINARY_DIR}/lib/cmake/llvm" 30 ) 31 32 # LLVMConfig.cmake contains a bunch of CMake variables from the LLVM build. 33 # This file is installed as part of LLVM distributions, so this can be used 34 # either from a build directory or an installed LLVM. 35 include(LLVMConfig) 36 37 # Setting these variables will allow the sub-build to put their outputs into 38 # the library and bin directories of the top-level build. 39 set(LLVM_LIBRARY_OUTPUT_INTDIR ${LLVM_LIBRARY_DIR}) 40 set(LLVM_RUNTIME_OUTPUT_INTDIR ${LLVM_BINARY_DIR}) 41 42 foreach(entry ${runtimes}) 43 get_filename_component(projName ${entry} NAME) 44 45 # TODO: Clean this up as part of an interface standardization 46 string(REPLACE "-" "_" canon_name ${projName}) 47 string(TOUPPER ${canon_name} canon_name) 48 # The subdirectories need to treat this as standalone builds 49 set(${canon_name}_STANDALONE_BUILD On) 50 51 add_subdirectory(${projName}) 52 endforeach() 53 54 else() # if this is included from LLVM's CMake 55 include(LLVMExternalProjectUtils) 56 57 # If compiler-rt is present we need to build the builtin libraries first. This 58 # is required because the other runtimes need the builtin libraries present 59 # before the just-built compiler can pass the configuration tests. 60 if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/compiler-rt) 61 llvm_ExternalProject_Add(builtins 62 ${CMAKE_CURRENT_SOURCE_DIR}/compiler-rt/lib/builtins 63 PASSTHROUGH_PREFIXES COMPILER_RT 64 USE_TOOLCHAIN) 65 set(deps builtins) 66 endif() 67 68 # We create a list the names of all the runtime projects in all uppercase and 69 # with dashes turned to underscores. This gives us the CMake variable prefixes 70 # for all variables that will apply to runtimes. 71 foreach(entry ${runtimes}) 72 get_filename_component(projName ${entry} NAME) 73 string(REPLACE "-" "_" canon_name ${projName}) 74 string(TOUPPER ${canon_name} canon_name) 75 list(APPEND prefixes ${canon_name}) 76 endforeach() 77 78 if(runtimes) 79 # Create a runtimes target that uses this file as its top-level CMake file. 80 # The runtimes target is a configuration of all the runtime libraries 81 # together in a single CMake invocaiton. 82 llvm_ExternalProject_Add(runtimes 83 ${CMAKE_CURRENT_SOURCE_DIR} 84 DEPENDS ${deps} llvm-config 85 # Builtins were built separately above 86 CMAKE_ARGS -DCOMPILER_RT_BUILD_BUILTINS=Off 87 PASSTHROUGH_PREFIXES ${prefixes} 88 USE_TOOLCHAIN) 89 endif() 90 endif() 91
