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+# This file handles building LLVM runtime sub-projects.
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+
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+# Runtimes are different from tools or other drop-in projects because runtimes
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+# should be built with the LLVM toolchain from the build directory. This file is
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+# a first step to formalizing runtime build interfaces.
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+
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+# In the current state this file only works with compiler-rt, other runtimes
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+# will work as the runtime build interface standardizes.
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+
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+# Find all subdirectories containing CMake projects
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+file(GLOB entries *)
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+foreach(entry ${entries})
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+ if(IS_DIRECTORY ${entry} AND EXISTS ${entry}/CMakeLists.txt)
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+ list(APPEND runtimes ${entry})
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+ endif()
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+endforeach()
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+
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+# If this file is acting as a top-level CMake invocation, this code path is
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+# triggered by the external project call for the runtimes target below.
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+if(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_CURRENT_SOURCE_DIR})
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+
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+ cmake_minimum_required(VERSION 3.4.3)
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+
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+ # Add the root project's CMake modules, and the LLVM build's modules to the
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+ # CMake module path.
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+ list(INSERT CMAKE_MODULE_PATH 0
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+ "${CMAKE_CURRENT_SOURCE_DIR}/../cmake"
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+ "${CMAKE_CURRENT_SOURCE_DIR}/../cmake/Modules"
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+ "${LLVM_BINARY_DIR}/lib/cmake/llvm"
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+ )
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+
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+ # LLVMConfig.cmake contains a bunch of CMake variables from the LLVM build.
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+ # This file is installed as part of LLVM distributions, so this can be used
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+ # either from a build directory or an installed LLVM.
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+ include(LLVMConfig)
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+
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+ # Setting these variables will allow the sub-build to put their outputs into
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+ # the library and bin directories of the top-level build.
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+ set(LLVM_LIBRARY_OUTPUT_INTDIR ${LLVM_LIBRARY_DIR})
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+ set(LLVM_RUNTIME_OUTPUT_INTDIR ${LLVM_BINARY_DIR})
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+
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+ foreach(entry ${runtimes})
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+ get_filename_component(projName ${entry} NAME)
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+
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+ # TODO: Clean this up as part of an interface standardization
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+ string(REPLACE "-" "_" canon_name ${projName})
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+ string(TOUPPER ${canon_name} canon_name)
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+ # The subdirectories need to treat this as standalone builds
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+ set(${canon_name}_STANDALONE_BUILD On)
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+
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+ add_subdirectory(${projName})
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+ endforeach()
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+
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+else() # if this is included from LLVM's CMake
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+ include(LLVMExternalProjectUtils)
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+
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+ # If compiler-rt is present we need to build the builtin libraries first. This
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+ # is required because the other runtimes need the builtin libraries present
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+ # before the just-built compiler can pass the configuration tests.
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+ if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/compiler-rt)
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+ llvm_ExternalProject_Add(builtins
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+ ${CMAKE_CURRENT_SOURCE_DIR}/compiler-rt/lib/builtins
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+ PASSTHROUGH_PREFIXES COMPILER_RT
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+ USE_TOOLCHAIN)
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+ set(deps builtins)
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+ endif()
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+
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+ # We create a list the names of all the runtime projects in all uppercase and
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+ # with dashes turned to underscores. This gives us the CMake variable prefixes
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+ # for all variables that will apply to runtimes.
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+ foreach(entry ${runtimes})
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+ get_filename_component(projName ${entry} NAME)
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+ string(REPLACE "-" "_" canon_name ${projName})
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+ string(TOUPPER ${canon_name} canon_name)
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+ list(APPEND prefixes ${canon_name})
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+ endforeach()
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+
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+ if(runtimes)
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+ # Create a runtimes target that uses this file as its top-level CMake file.
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+ # The runtimes target is a configuration of all the runtime libraries
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+ # together in a single CMake invocaiton.
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+ llvm_ExternalProject_Add(runtimes
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+ ${CMAKE_CURRENT_SOURCE_DIR}
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+ DEPENDS ${deps} llvm-config
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+ # Builtins were built separately above
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+ CMAKE_ARGS -DCOMPILER_RT_BUILD_BUILTINS=Off
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+ PASSTHROUGH_PREFIXES ${prefixes}
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+ USE_TOOLCHAIN)
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+ endif()
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+endif()
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Chris Bieneman