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3fe6b38cf2
Summary: There are a few LLVM projects that produce runtime libraries. Ideally runtime libraries should be built differently than other projects, specifically they should be built using the just-built toolchain. There is support for building compiler-rt in this way from the clang build. Moving this logic into the LLVM build is interesting because it provides a simpler way to extend the just-built toolchain to include LLD and the LLVM object file tools. Once this functionality is better fleshed out and tested we’ll want to encapsulate it in a module that can be used for clang standalone builds, and we’ll want to make it the default way to build compiler-rt. With this patch applied there is no immediate change in the build. Moving compiler-rt out from llvm/projects into llvm/runtimes enables the functionality. This code has a few improvements over the method provided by LLVM_BUILD_EXTERNAL_COMPILER_RT. Specifically the sub-ninja command is always invoked, so changes to compiler-rt source files will get built properly, so this patch can be used for iterative development with just-built tools. This first patch only works with compiler-rt. Support for other runtime projects will be coming in follow-up patches. Reviewers: chandlerc, bogner Subscribers: kubabrecka, llvm-commits Differential Revision: http://reviews.llvm.org/D20992 llvm-svn: 273620
91 lines
3.7 KiB
CMake
91 lines
3.7 KiB
CMake
# This file handles building LLVM runtime sub-projects.
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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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# 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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# 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 ${entry})
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endif()
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endforeach()
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# If this file is acting as a top-level CMake invocation, this code path is
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# triggered by the external project call for the runtimes target below.
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if(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_CURRENT_SOURCE_DIR})
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cmake_minimum_required(VERSION 3.4.3)
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# Add the root project's CMake modules, and the LLVM build's modules to the
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# CMake module path.
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list(INSERT CMAKE_MODULE_PATH 0
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"${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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# 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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# 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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foreach(entry ${runtimes})
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get_filename_component(projName ${entry} NAME)
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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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add_subdirectory(${projName})
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endforeach()
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else() # if this is included from LLVM's CMake
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include(LLVMExternalProjectUtils)
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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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# 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 ${canon_name})
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endforeach()
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if(runtimes)
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# Create a runtimes target that uses this file as its top-level CMake file.
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# The runtimes target is a configuration of all the runtime libraries
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# together in a single CMake invocaiton.
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llvm_ExternalProject_Add(runtimes
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${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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