# This file handles building LLVM runtime sub-projects.
cmake_minimum_required(VERSION 3.20.0)
# Add path for custom and the LLVM build's modules to the CMake module path.
set(LLVM_COMMON_CMAKE_UTILS "${CMAKE_CURRENT_SOURCE_DIR}/../cmake")
include(${LLVM_COMMON_CMAKE_UTILS}/Modules/CMakePolicy.cmake
NO_POLICY_SCOPE)
include(${LLVM_COMMON_CMAKE_UTILS}/Modules/LLVMVersion.cmake)
project(Runtimes C CXX ASM)
set(LLVM_SUBPROJECT_TITLE "Runtimes")
set_property(GLOBAL PROPERTY USE_FOLDERS ON)
list(INSERT CMAKE_MODULE_PATH 0
"${CMAKE_CURRENT_SOURCE_DIR}/cmake"
"${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules"
"${LLVM_COMMON_CMAKE_UTILS}"
"${LLVM_COMMON_CMAKE_UTILS}/Modules"
"${CMAKE_CURRENT_SOURCE_DIR}/../llvm/cmake"
"${CMAKE_CURRENT_SOURCE_DIR}/../llvm/cmake/modules"
)
# We order libraries to mirror roughly how they are layered, except that compiler-rt can depend
# on libc++, so we put it after.
set(LLVM_DEFAULT_RUNTIMES "libc;libunwind;libcxxabi;pstl;libcxx;compiler-rt;openmp;offload")
set(LLVM_SUPPORTED_RUNTIMES "${LLVM_DEFAULT_RUNTIMES};llvm-libgcc")
set(LLVM_ENABLE_RUNTIMES "" CACHE STRING
"Semicolon-separated list of runtimes to build, or \"all\" (${LLVM_DEFAULT_RUNTIMES}). Supported runtimes are ${LLVM_SUPPORTED_RUNTIMES}.")
if(LLVM_ENABLE_RUNTIMES STREQUAL "all" )
set(LLVM_ENABLE_RUNTIMES ${LLVM_DEFAULT_RUNTIMES})
endif()
include(SortSubset)
sort_subset("${LLVM_SUPPORTED_RUNTIMES}" "${LLVM_ENABLE_RUNTIMES}" LLVM_ENABLE_RUNTIMES)
foreach(proj ${LLVM_ENABLE_RUNTIMES})
set(proj_dir "${CMAKE_CURRENT_SOURCE_DIR}/../${proj}")
if(IS_DIRECTORY ${proj_dir} AND EXISTS ${proj_dir}/CMakeLists.txt)
list(APPEND runtimes ${proj_dir})
else()
message(FATAL_ERROR "LLVM_ENABLE_RUNTIMES requests ${proj} but directory not found: ${proj_dir}")
endif()
string(TOUPPER "${proj}" canon_name)
STRING(REGEX REPLACE "-" "_" canon_name ${canon_name})
set(LLVM_EXTERNAL_${canon_name}_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../${proj}")
endforeach()
function(runtime_register_component name)
set_property(GLOBAL APPEND PROPERTY SUB_COMPONENTS ${name})
endfunction()
find_package(LLVM PATHS "${LLVM_BINARY_DIR}" NO_DEFAULT_PATH NO_CMAKE_FIND_ROOT_PATH)
find_package(Clang PATHS "${LLVM_BINARY_DIR}" NO_DEFAULT_PATH NO_CMAKE_FIND_ROOT_PATH)
set(LLVM_THIRD_PARTY_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../third-party")
# If building standalone by pointing CMake at this runtimes directory,
# LLVM_BINARY_DIR isn't set, find_package(LLVM) will fail and these
# intermediate paths are unset.
if (NOT LLVM_BINARY_DIR)
set(LLVM_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR})
endif()
if (NOT LLVM_FOUND)
set(LLVM_TOOLS_BINARY_DIR ${LLVM_BINARY_DIR}/bin)
set(LLVM_INCLUDE_DIR ${CMAKE_CURRENT_BINARY_DIR}/include)
set(LLVM_LIBRARY_DIR ${CMAKE_CURRENT_BINARY_DIR}/lib)
endif()
# Setting these variables will allow the sub-build to put their outputs into
# the library and bin directories of the top-level build.
set(LLVM_LIBRARY_OUTPUT_INTDIR ${LLVM_LIBRARY_DIR})
set(LLVM_RUNTIME_OUTPUT_INTDIR ${LLVM_TOOLS_BINARY_DIR})
# This variable makes sure that e.g. llvm-lit is found.
set(LLVM_MAIN_SRC_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../llvm)
set(LLVM_CMAKE_DIR ${LLVM_MAIN_SRC_DIR}/cmake/modules)
# This variable is used by individual runtimes to locate LLVM files.
set(LLVM_PATH ${CMAKE_CURRENT_SOURCE_DIR}/../llvm)
include(CheckLibraryExists)
include(LLVMCheckCompilerLinkerFlag)
include(CheckCCompilerFlag)
include(CheckCXXCompilerFlag)
# CMake omits default compiler include paths, but in runtimes build, we use
# -nostdinc and -nostdinc++ and control include paths manually so this behavior
# is undesirable. Filtering CMAKE_{LANG}_IMPLICIT_INCLUDE_DIRECTORIES to remove
# paths that are inside the build directory disables this behavior.
#
# See https://gitlab.kitware.com/cmake/cmake/-/issues/19227 for further details.
function(filter_prefixed list prefix outvar)
foreach(str ${list})
string(FIND "${str}" "${prefix}" out)
if(NOT "${out}" EQUAL 0)
list(APPEND result ${str})
endif()
endforeach()
set(${outvar} ${result} PARENT_SCOPE)
endfunction()
filter_prefixed("${CMAKE_C_IMPLICIT_INCLUDE_DIRECTORIES}" ${LLVM_BINARY_DIR} CMAKE_C_IMPLICIT_INCLUDE_DIRECTORIES)
filter_prefixed("${CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES}" ${LLVM_BINARY_DIR} CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES)
filter_prefixed("${CMAKE_ASM_IMPLICIT_INCLUDE_DIRECTORIES}" ${LLVM_BINARY_DIR} CMAKE_ASM_IMPLICIT_INCLUDE_DIRECTORIES)
# The compiler driver may be implicitly trying to link against libunwind,
# which might not work if libunwind doesn't exist yet. Try to check if
# --unwindlib=none is supported, and use that if possible.
#
# TODO: Note that this is problematic when LLVM_USE_SANITIZER is used
# because some sanitizers require the unwinder and so the combination of
# -fsanitize=... --unwindlib=none will always result in a linking error.
# Currently, we counteract this issue by adding -fno-sanitize=all flag in
# the project specific code within */cmake/config-ix.cmake files but that's
# brittle. We should ideally move this to runtimes/CMakeLists.txt.
llvm_check_compiler_linker_flag(C "--unwindlib=none" CXX_SUPPORTS_UNWINDLIB_EQ_NONE_FLAG)
if (CXX_SUPPORTS_UNWINDLIB_EQ_NONE_FLAG)
set(ORIG_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} --unwindlib=none")
# TODO: When we can require CMake 3.14, we should use
# CMAKE_REQUIRED_LINK_OPTIONS here. Until then, we need a workaround:
# When using CMAKE_REQUIRED_FLAGS, this option gets added both to
# compilation and linking commands. That causes warnings in the
# compilation commands during cmake tests. This is normally benign, but
# when testing whether -Werror works, that test fails (due to the
# preexisting warning).
#
# Therefore, before we can use CMAKE_REQUIRED_LINK_OPTIONS, check if we
# can use --start-no-unused-arguments to silence the warnings about
# --unwindlib=none during compilation.
#
# We must first add --unwindlib=none to CMAKE_REQUIRED_FLAGS above, to
# allow this subsequent test to succeed, then rewrite CMAKE_REQUIRED_FLAGS
# below.
check_c_compiler_flag("--start-no-unused-arguments" C_SUPPORTS_START_NO_UNUSED_ARGUMENTS)
if (C_SUPPORTS_START_NO_UNUSED_ARGUMENTS)
set(CMAKE_REQUIRED_FLAGS "${ORIG_CMAKE_REQUIRED_FLAGS} --start-no-unused-arguments --unwindlib=none --end-no-unused-arguments")
endif()
endif()
# Disable use of the installed C++ standard library when building runtimes.
# Check for -nostdlib++ first; if there's no C++ standard library yet,
# all check_cxx_compiler_flag commands will fail until we add -nostdlib++
# (or -nodefaultlibs).
llvm_check_compiler_linker_flag(CXX "-nostdlib++" CXX_SUPPORTS_NOSTDLIBXX_FLAG)
if (CXX_SUPPORTS_NOSTDLIBXX_FLAG)
set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -nostdlib++")
endif()
check_cxx_compiler_flag(-nostdinc++ CXX_SUPPORTS_NOSTDINCXX_FLAG)
if (CXX_SUPPORTS_NOSTDINCXX_FLAG)
set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -nostdinc++")
endif()
# Avoid checking whether the compiler is working.
set(LLVM_COMPILER_CHECKED ON)
# This can be used to detect whether we're targeting a GPU architecture.
if("${LLVM_RUNTIMES_TARGET}" MATCHES "^amdgcn" OR
"${LLVM_RUNTIMES_TARGET}" MATCHES "^nvptx64")
set(LLVM_RUNTIMES_GPU_BUILD ON)
endif()
# Handle common options used by all runtimes.
include(AddLLVM)
include(HandleLLVMOptions)
# Loot at the PATH first to avoid a version mismatch between the command-line
# python and the CMake-found version
set(Python3_FIND_REGISTRY LAST)
find_package(Python3 REQUIRED COMPONENTS Interpreter)
# Host triple is used by tests to check if they are running natively.
include(GetHostTriple)
get_host_triple(LLVM_HOST_TRIPLE)
message(STATUS "LLVM host triple: ${LLVM_HOST_TRIPLE}")
# TODO: We shouldn't be using LLVM_DEFAULT_TARGET_TRIPLE for runtimes since we
# aren't generating code, LLVM_TARGET_TRIPLE is a better fit.
set(LLVM_DEFAULT_TARGET_TRIPLE "${LLVM_HOST_TRIPLE}" CACHE STRING
"Default target for which the runtimes will be built.")
message(STATUS "LLVM default target triple: ${LLVM_DEFAULT_TARGET_TRIPLE}")
set(LLVM_TARGET_TRIPLE "${LLVM_DEFAULT_TARGET_TRIPLE}")
if(CMAKE_C_COMPILER_ID MATCHES "Clang")
set(option_prefix "")
if (CMAKE_C_SIMULATE_ID MATCHES "MSVC")
set(option_prefix "/clang:")
endif()
set(print_target_triple ${CMAKE_C_COMPILER} ${option_prefix}--target=${LLVM_DEFAULT_TARGET_TRIPLE} ${option_prefix}-print-target-triple)
execute_process(COMMAND ${print_target_triple}
RESULT_VARIABLE result
OUTPUT_VARIABLE output
OUTPUT_STRIP_TRAILING_WHITESPACE)
if(result EQUAL 0)
set(LLVM_DEFAULT_TARGET_TRIPLE ${output})
else()
string(REPLACE ";" " " print_target_triple "${print_target_triple}")
# TODO(#97876): Report an error.
message(WARNING "Failed to execute `${print_target_triple}` to normalize target triple.")
endif()
endif()
option(LLVM_INCLUDE_TESTS "Generate build targets for the runtimes unit tests." ON)
option(LLVM_INCLUDE_DOCS "Generate build targets for the runtimes documentation." ON)
option(LLVM_ENABLE_SPHINX "Use Sphinx to generate the runtimes documentation." OFF)
# Use libtool instead of ar if you are both on an Apple host, and targeting Apple.
if(CMAKE_HOST_APPLE AND APPLE)
include(UseLibtool)
endif()
# This can be used to detect whether we're in the runtimes build.
set(LLVM_RUNTIMES_BUILD ON)
foreach(entry ${runtimes})
get_filename_component(projName ${entry} NAME)
# TODO: Clean this up as part of an interface standardization
string(REPLACE "-" "_" canon_name ${projName})
string(TOUPPER ${canon_name} canon_name)
# TODO: compiler-rt has to use standalone build for now. We tried to remove
# this in D57992 but this broke the build because compiler-rt assumes that
# LLVM and Clang are configured in the same build to set up dependencies. We
# should clean up the compiler-rt build and remove this eventually.
if ("${canon_name}" STREQUAL "COMPILER_RT")
set(${canon_name}_STANDALONE_BUILD ON)
endif()
if(LLVM_RUNTIMES_LIBDIR_SUBDIR)
set(${canon_name}_LIBDIR_SUBDIR "${LLVM_RUNTIMES_LIBDIR_SUBDIR}" CACHE STRING "" FORCE)
endif()
# Setting a variable to let sub-projects detect which other projects
# will be included under here.
set(HAVE_${canon_name} ON)
endforeach()
if(LLVM_INCLUDE_TESTS)
set(LIT_ARGS_DEFAULT "-sv --show-xfail --show-unsupported")
if (MSVC OR XCODE)
set(LIT_ARGS_DEFAULT "${LIT_ARGS_DEFAULT} --no-progress-bar")
endif()
set(LLVM_LIT_ARGS "${LIT_ARGS_DEFAULT}" CACHE STRING "Default options for lit")
umbrella_lit_testsuite_begin(check-runtimes)
endif()
# We do this in two loops so that HAVE_* is set for each runtime before the
# other runtimes are added.
foreach(entry ${runtimes})
get_filename_component(projName ${entry} NAME)
add_subdirectory(${entry} ${projName})
endforeach()
# Define runtimes-test-depends so the parent build can use it unconditionally.
add_custom_target(runtimes-test-depends)
if(LLVM_INCLUDE_TESTS)
# LLVM_RUNTIMES_LIT_DEPENDS is populated when lit tests are added between
# umbrella_list_testsuite begin and end. The bootstrap runtimes builds
# currently assumes this target exists.
get_property(LLVM_RUNTIMES_LIT_DEPENDS GLOBAL PROPERTY LLVM_RUNTIMES_LIT_DEPENDS)
if(LLVM_RUNTIMES_LIT_DEPENDS)
# add_dependencies complains if called with no dependencies
add_dependencies(runtimes-test-depends ${LLVM_RUNTIMES_LIT_DEPENDS})
endif()
# Add a global check rule now that all subdirectories have been traversed
# and we know the total set of lit testsuites.
umbrella_lit_testsuite_end(check-runtimes)
if (NOT HAVE_LLVM_LIT)
# If built by manually invoking cmake on this directory, we don't have
# llvm-lit. If invoked via llvm/runtimes, the toplevel llvm cmake
# invocation already generated the llvm-lit script.
add_subdirectory(${LLVM_MAIN_SRC_DIR}/utils/llvm-lit
${CMAKE_CURRENT_BINARY_DIR}/llvm-lit)
endif()
get_property(LLVM_RUNTIMES_LIT_TESTSUITES GLOBAL PROPERTY LLVM_RUNTIMES_LIT_TESTSUITES)
string(REPLACE ";" "\n" LLVM_RUNTIMES_LIT_TESTSUITES "${LLVM_RUNTIMES_LIT_TESTSUITES}")
file(WRITE ${CMAKE_CURRENT_BINARY_DIR}/lit.tests ${LLVM_RUNTIMES_LIT_TESTSUITES})
else()
# Create empty files so the parent build can use these unconditionally.
file(TOUCH ${CMAKE_CURRENT_BINARY_DIR}/lit.tests)
endif()
get_property(SUB_COMPONENTS GLOBAL PROPERTY SUB_COMPONENTS)
if(SUB_COMPONENTS)
list(REMOVE_DUPLICATES SUB_COMPONENTS)
foreach(component ${SUB_COMPONENTS})
if(NOT TARGET ${component})
message(SEND_ERROR "Missing target for runtime component ${component}!")
continue()
endif()
if(TARGET check-${component})
list(APPEND SUB_CHECK_TARGETS check-${component})
endif()
if(TARGET install-${component})
list(APPEND SUB_INSTALL_TARGETS install-${component})
endif()
endforeach()
if(LLVM_RUNTIMES_TARGET)
configure_file(
${CMAKE_CURRENT_SOURCE_DIR}/Components.cmake.in
${LLVM_BINARY_DIR}/runtimes/${LLVM_RUNTIMES_TARGET}/Components.cmake)
else()
configure_file(
${CMAKE_CURRENT_SOURCE_DIR}/Components.cmake.in
${LLVM_BINARY_DIR}/runtimes/Components.cmake)
endif()
endif()
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