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include(ExternalProject)
# llvm_ExternalProject_BuildCmd(out_var target)
# Utility function for constructing command lines for external project targets
function(llvm_ExternalProject_BuildCmd out_var target bin_dir)
if (CMAKE_GENERATOR MATCHES "Make")
# Use special command for Makefiles to support parallelism.
set(${out_var} "$(MAKE)" "-C" "${BINARY_DIR}" "${target}" PARENT_SCOPE)
else()
set(${out_var} ${CMAKE_COMMAND} --build ${bin_dir} --target ${target}
--config $<CONFIGURATION> PARENT_SCOPE)
endif()
endfunction()
# llvm_ExternalProject_Add(name source_dir ...
# USE_TOOLCHAIN
# Use just-built tools (see TOOLCHAIN_TOOLS)
# EXCLUDE_FROM_ALL
# Exclude this project from the all target
# NO_INSTALL
# Don't generate install targets for this project
# ALWAYS_CLEAN
# Always clean the sub-project before building
# CMAKE_ARGS arguments...
# Optional cmake arguments to pass when configuring the project
# TOOLCHAIN_TOOLS targets...
# Targets for toolchain tools (defaults to clang;lld)
# DEPENDS targets...
# Targets that this project depends on
# EXTRA_TARGETS targets...
# Extra targets in the subproject to generate targets for
# PASSTHROUGH_PREFIXES prefix...
# Extra variable prefixes (name is always included) to pass down
# )
function(llvm_ExternalProject_Add name source_dir)
cmake_parse_arguments(ARG
"USE_TOOLCHAIN;EXCLUDE_FROM_ALL;NO_INSTALL;ALWAYS_CLEAN"
"SOURCE_DIR"
"CMAKE_ARGS;TOOLCHAIN_TOOLS;RUNTIME_LIBRARIES;DEPENDS;EXTRA_TARGETS;PASSTHROUGH_PREFIXES"
${ARGN})
canonicalize_tool_name(${name} nameCanon)
if(NOT ARG_TOOLCHAIN_TOOLS)
set(ARG_TOOLCHAIN_TOOLS clang lld)
endif()
foreach(tool ${ARG_TOOLCHAIN_TOOLS})
if(TARGET ${tool})
list(APPEND TOOLCHAIN_TOOLS ${tool})
list(APPEND TOOLCHAIN_BINS $<TARGET_FILE:${tool}>)
endif()
endforeach()
if(NOT ARG_RUNTIME_LIBRARIES)
set(ARG_RUNTIME_LIBRARIES compiler-rt libcxx)
endif()
foreach(lib ${ARG_RUNTIME_LIBRARIES})
if(TARGET ${lib})
list(APPEND RUNTIME_LIBRARIES ${lib})
endif()
endforeach()
if(ARG_ALWAYS_CLEAN)
set(always_clean clean)
endif()
list(FIND TOOLCHAIN_TOOLS clang FOUND_CLANG)
if(FOUND_CLANG GREATER -1)
set(CLANG_IN_TOOLCHAIN On)
endif()
if(RUNTIME_LIBRARIES AND CLANG_IN_TOOLCHAIN)
list(APPEND TOOLCHAIN_BINS ${RUNTIME_LIBRARIES})
endif()
set(STAMP_DIR ${CMAKE_CURRENT_BINARY_DIR}/${name}-stamps/)
set(BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR}/${name}-bins/)
add_custom_target(${name}-clear
COMMAND ${CMAKE_COMMAND} -E remove_directory ${BINARY_DIR}
COMMAND ${CMAKE_COMMAND} -E remove_directory ${STAMP_DIR}
COMMENT "Clobbering ${name} build and stamp directories"
USES_TERMINAL
)
# Find all variables that start with a prefix and propagate them through
get_cmake_property(variableNames VARIABLES)
list(APPEND ARG_PASSTHROUGH_PREFIXES ${nameCanon})
foreach(prefix ${ARG_PASSTHROUGH_PREFIXES})
foreach(variableName ${variableNames})
if(variableName MATCHES "^${prefix}")
string(REPLACE ";" "\;" value "${${variableName}}")
list(APPEND PASSTHROUGH_VARIABLES
-D${variableName}=${value})
endif()
endforeach()
endforeach()
if(ARG_USE_TOOLCHAIN)
if(CLANG_IN_TOOLCHAIN)
set(compiler_args -DCMAKE_C_COMPILER=${LLVM_RUNTIME_OUTPUT_INTDIR}/clang
-DCMAKE_CXX_COMPILER=${LLVM_RUNTIME_OUTPUT_INTDIR}/clang++)
endif()
list(APPEND ARG_DEPENDS ${TOOLCHAIN_TOOLS})
endif()
add_custom_command(
OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${name}-clobber-stamp
DEPENDS ${ARG_DEPENDS}
COMMAND ${CMAKE_COMMAND} -E touch ${BINARY_DIR}/CMakeCache.txt
COMMAND ${CMAKE_COMMAND} -E touch ${STAMP_DIR}/${name}-mkdir
COMMAND ${CMAKE_COMMAND} -E touch ${CMAKE_CURRENT_BINARY_DIR}/${name}-clobber-stamp
COMMENT "Clobbering bootstrap build and stamp directories"
)
add_custom_target(${name}-clobber
DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${name}-clobber-stamp)
if(ARG_EXCLUDE_FROM_ALL)
set(exclude EXCLUDE_FROM_ALL 1)
endif()
ExternalProject_Add(${name}
DEPENDS ${ARG_DEPENDS}
${name}-clobber
PREFIX ${CMAKE_BINARY_DIR}/projects/${name}
SOURCE_DIR ${source_dir}
STAMP_DIR ${STAMP_DIR}
BINARY_DIR ${BINARY_DIR}
${exclude}
CMAKE_ARGS ${${nameCanon}_CMAKE_ARGS}
${compiler_args}
-DCMAKE_INSTALL_PREFIX=${CMAKE_INSTALL_PREFIX}
-DLLVM_BINARY_DIR=${PROJECT_BINARY_DIR}
-DLLVM_CONFIG_PATH=$<TARGET_FILE:llvm-config>
-DLLVM_ENABLE_WERROR=${LLVM_ENABLE_WERROR}
-DPACKAGE_VERSION=${PACKAGE_VERSION}
-DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
-DCMAKE_MAKE_PROGRAM=${CMAKE_MAKE_PROGRAM}
${ARG_CMAKE_ARGS}
${PASSTHROUGH_VARIABLES}
INSTALL_COMMAND ""
STEP_TARGETS configure build
BUILD_ALWAYS 1
USES_TERMINAL_CONFIGURE 1
USES_TERMINAL_BUILD 1
USES_TERMINAL_INSTALL 1
)
if(ARG_USE_TOOLCHAIN)
set(force_deps DEPENDS ${TOOLCHAIN_BINS})
endif()
llvm_ExternalProject_BuildCmd(run_clean clean ${BINARY_DIR})
ExternalProject_Add_Step(${name} clean
COMMAND ${run_clean}
COMMENT "Cleaning ${name}..."
DEPENDEES configure
${force_deps}
WORKING_DIRECTORY ${BINARY_DIR}
EXCLUDE_FROM_MAIN 1
USES_TERMINAL 1
)
ExternalProject_Add_StepTargets(${name} clean)
if(ARG_USE_TOOLCHAIN)
add_dependencies(${name}-clean ${name}-clobber)
set_target_properties(${name}-clean PROPERTIES
SOURCES ${CMAKE_CURRENT_BINARY_DIR}/${name}-clobber-stamp)
endif()
if(NOT ARG_NO_INSTALL)
install(CODE "execute_process\(COMMAND \${CMAKE_COMMAND} -DCMAKE_INSTALL_PREFIX=\${CMAKE_INSTALL_PREFIX} -P ${BINARY_DIR}/cmake_install.cmake \)"
COMPONENT ${name})
add_custom_target(install-${name}
DEPENDS ${name}
COMMAND "${CMAKE_COMMAND}"
-DCMAKE_INSTALL_COMPONENT=${name}
-P "${CMAKE_BINARY_DIR}/cmake_install.cmake"
USES_TERMINAL)
endif()
# Add top-level targets
foreach(target ${ARG_EXTRA_TARGETS})
llvm_ExternalProject_BuildCmd(build_runtime_cmd ${target} ${BINARY_DIR})
add_custom_target(${target}
COMMAND ${build_runtime_cmd}
DEPENDS ${name}-configure
WORKING_DIRECTORY ${BINARY_DIR}
VERBATIM
USES_TERMINAL)
endforeach()
endfunction()
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