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llvm-project/libc/cmake/modules/LLVMLibCObjectRules.cmake

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CMake
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set(OBJECT_LIBRARY_TARGET_TYPE "OBJECT_LIBRARY")
function(_get_compile_options_from_flags output_var)
set(compile_options "")
if(LIBC_TARGET_ARCHITECTURE_IS_RISCV64 OR(LIBC_CPU_FEATURES MATCHES "FMA"))
check_flag(ADD_FMA_FLAG ${FMA_OPT_FLAG} ${flags})
endif()
check_flag(ADD_SSE4_2_FLAG ${ROUND_OPT_FLAG} ${flags})
check_flag(ADD_EXPLICIT_SIMD_OPT_FLAG ${EXPLICIT_SIMD_OPT_FLAG} ${flags})
if(LLVM_COMPILER_IS_GCC_COMPATIBLE)
if(ADD_FMA_FLAG)
if(LIBC_TARGET_ARCHITECTURE_IS_X86)
list(APPEND compile_options "-mavx2")
list(APPEND compile_options "-mfma")
elseif(LIBC_TARGET_ARCHITECTURE_IS_RISCV64)
list(APPEND compile_options "-D__LIBC_RISCV_USE_FMA")
endif()
endif()
if(ADD_SSE4_2_FLAG)
list(APPEND compile_options "-msse4.2")
endif()
if(ADD_EXPLICIT_SIMD_OPT_FLAG)
list(APPEND compile_options "-D__LIBC_EXPLICIT_SIMD_OPT")
endif()
elseif(MSVC)
if(ADD_FMA_FLAG)
list(APPEND compile_options "/arch:AVX2")
endif()
if(ADD_EXPLICIT_SIMD_OPT_FLAG)
list(APPEND compile_options "/D__LIBC_EXPLICIT_SIMD_OPT")
endif()
endif()
set(${output_var} ${compile_options} PARENT_SCOPE)
endfunction(_get_compile_options_from_flags)
function(_get_common_compile_options output_var flags)
_get_compile_options_from_flags(compile_flags ${flags})
set(compile_options ${LIBC_COMPILE_OPTIONS_DEFAULT} ${compile_flags})
if(LLVM_COMPILER_IS_GCC_COMPATIBLE)
list(APPEND compile_options "-fpie")
if(LLVM_LIBC_FULL_BUILD)
# Only add -ffreestanding flag in full build mode.
list(APPEND compile_options "-ffreestanding")
endif()
if(LIBC_COMPILER_HAS_FIXED_POINT)
list(APPEND compile_options "-ffixed-point")
endif()
list(APPEND compile_options "-fno-builtin")
list(APPEND compile_options "-fno-exceptions")
list(APPEND compile_options "-fno-lax-vector-conversions")
list(APPEND compile_options "-fno-unwind-tables")
list(APPEND compile_options "-fno-asynchronous-unwind-tables")
list(APPEND compile_options "-fno-rtti")
if (LIBC_CC_SUPPORTS_PATTERN_INIT)
list(APPEND compile_options "-ftrivial-auto-var-init=pattern")
endif()
list(APPEND compile_options "-Wall")
list(APPEND compile_options "-Wextra")
# -DLIBC_WNO_ERROR=ON if you can't build cleanly with -Werror.
if(NOT LIBC_WNO_ERROR)
list(APPEND compile_options "-Werror")
endif()
list(APPEND compile_options "-Wconversion")
list(APPEND compile_options "-Wno-sign-conversion")
list(APPEND compile_options "-Wimplicit-fallthrough")
list(APPEND compile_options "-Wwrite-strings")
list(APPEND compile_options "-Wextra-semi")
if(NOT CMAKE_COMPILER_IS_GNUCXX)
list(APPEND compile_options "-Wnewline-eof")
list(APPEND compile_options "-Wnonportable-system-include-path")
list(APPEND compile_options "-Wstrict-prototypes")
list(APPEND compile_options "-Wthread-safety")
list(APPEND compile_options "-Wglobal-constructors")
endif()
elseif(MSVC)
list(APPEND compile_options "/EHs-c-")
list(APPEND compile_options "/GR-")
endif()
if (LIBC_TARGET_ARCHITECTURE_IS_GPU)
list(APPEND compile_options "-nogpulib")
list(APPEND compile_options "-fvisibility=hidden")
list(APPEND compile_options "-fconvergent-functions")
# Manually disable all standard include paths and include the resource
# directory to prevent system headers from being included.
list(APPEND compile_options "-isystem${COMPILER_RESOURCE_DIR}/include")
list(APPEND compile_options "-nostdinc")
endif()
set(${output_var} ${compile_options} PARENT_SCOPE)
endfunction()
# Obtains NVPTX specific arguments for compilation.
# The PTX feature is primarily based on the CUDA toolchain version. We want to
# be able to target NVPTX without an existing CUDA installation, so we need to
# set this manually. This simply sets the PTX feature to the minimum required
# for the features we wish to use on that target. The minimum PTX features used
# here roughly corresponds to the CUDA 9.0 release.
# Adjust as needed for desired PTX features.
function(get_nvptx_compile_options output_var gpu_arch)
set(nvptx_options "")
list(APPEND nvptx_options "-march=${gpu_arch}")
list(APPEND nvptx_options "-Wno-unknown-cuda-version")
list(APPEND nvptx_options "SHELL:-mllvm -nvptx-emit-init-fini-kernel=false")
if(${gpu_arch} STREQUAL "sm_35")
list(APPEND nvptx_options "--cuda-feature=+ptx63")
elseif(${gpu_arch} STREQUAL "sm_37")
list(APPEND nvptx_options "--cuda-feature=+ptx63")
elseif(${gpu_arch} STREQUAL "sm_50")
list(APPEND nvptx_options "--cuda-feature=+ptx63")
elseif(${gpu_arch} STREQUAL "sm_52")
list(APPEND nvptx_options "--cuda-feature=+ptx63")
elseif(${gpu_arch} STREQUAL "sm_53")
list(APPEND nvptx_options "--cuda-feature=+ptx63")
elseif(${gpu_arch} STREQUAL "sm_60")
list(APPEND nvptx_options "--cuda-feature=+ptx63")
elseif(${gpu_arch} STREQUAL "sm_61")
list(APPEND nvptx_options "--cuda-feature=+ptx63")
elseif(${gpu_arch} STREQUAL "sm_62")
list(APPEND nvptx_options "--cuda-feature=+ptx63")
elseif(${gpu_arch} STREQUAL "sm_70")
list(APPEND nvptx_options "--cuda-feature=+ptx63")
elseif(${gpu_arch} STREQUAL "sm_72")
list(APPEND nvptx_options "--cuda-feature=+ptx63")
elseif(${gpu_arch} STREQUAL "sm_75")
list(APPEND nvptx_options "--cuda-feature=+ptx63")
elseif(${gpu_arch} STREQUAL "sm_80")
list(APPEND nvptx_options "--cuda-feature=+ptx72")
elseif(${gpu_arch} STREQUAL "sm_86")
list(APPEND nvptx_options "--cuda-feature=+ptx72")
elseif(${gpu_arch} STREQUAL "sm_89")
list(APPEND nvptx_options "--cuda-feature=+ptx72")
elseif(${gpu_arch} STREQUAL "sm_90")
list(APPEND nvptx_options "--cuda-feature=+ptx72")
else()
message(FATAL_ERROR "Unknown Nvidia GPU architecture '${gpu_arch}'")
endif()
if(LIBC_CUDA_ROOT)
list(APPEND nvptx_options "--cuda-path=${LIBC_CUDA_ROOT}")
endif()
set(${output_var} ${nvptx_options} PARENT_SCOPE)
endfunction()
# Build the object target for a single GPU arch.
# Usage:
# _build_gpu_object_for_single_arch(
# <target_name>
# <gpu_arch>
# SRCS <list of .cpp files>
# HDRS <list of .h files>
# DEPENDS <list of dependencies>
# COMPILE_OPTIONS <optional list of special compile options for this target>
# FLAGS <optional list of flags>
# )
function(_build_gpu_object_for_single_arch fq_target_name gpu_arch)
cmake_parse_arguments(
"ADD_GPU_OBJ"
"" # No optional arguments
"NAME;CXX_STANDARD" # Single value arguments
"SRCS;HDRS;DEPENDS;COMPILE_OPTIONS;FLAGS" # Multi value arguments
${ARGN}
)
if(NOT ADD_GPU_OBJ_CXX_STANDARD)
set(ADD_GPU_OBJ_CXX_STANDARD ${CMAKE_CXX_STANDARD})
endif()
set(compile_options ${ADD_GPU_OBJ_COMPILE_OPTIONS})
# Derive the triple from the specified architecture.
if("${gpu_arch}" IN_LIST all_amdgpu_architectures)
set(gpu_target_triple ${AMDGPU_TARGET_TRIPLE})
list(APPEND compile_options "-mcpu=${gpu_arch}")
list(APPEND compile_options "SHELL:-Xclang -mcode-object-version=none")
list(APPEND compile_options "-emit-llvm")
elseif("${gpu_arch}" IN_LIST all_nvptx_architectures)
set(gpu_target_triple ${NVPTX_TARGET_TRIPLE})
get_nvptx_compile_options(nvptx_options ${gpu_arch})
list(APPEND compile_options "${nvptx_options}")
else()
message(FATAL_ERROR "Unknown GPU architecture '${gpu_arch}'")
endif()
list(APPEND compile_options "--target=${gpu_target_triple}")
# Build the library for this target architecture. We always emit LLVM-IR for
# packaged GPU binaries.
add_library(${fq_target_name}
EXCLUDE_FROM_ALL
OBJECT
${ADD_GPU_OBJ_SRCS}
${ADD_GPU_OBJ_HDRS}
)
target_compile_options(${fq_target_name} PRIVATE ${compile_options})
target_include_directories(${fq_target_name} SYSTEM PRIVATE ${LIBC_INCLUDE_DIR})
target_include_directories(${fq_target_name} PRIVATE ${LIBC_SOURCE_DIR})
set_target_properties(${fq_target_name} PROPERTIES CXX_STANDARD ${ADD_GPU_OBJ_CXX_STANDARD})
if(ADD_GPU_OBJ_DEPENDS)
add_dependencies(${fq_target_name} ${ADD_GPU_OBJ_DEPENDS})
set_target_properties(${fq_target_name} PROPERTIES DEPS "${ADD_GPU_OBJ_DEPENDS}")
endif()
endfunction(_build_gpu_object_for_single_arch)
# Build the object target for the GPU.
# This compiles the target for all supported architectures and embeds it into
# host binary for installing.
# Usage:
# _build_gpu_object_bundle(
# <target_name>
# SRCS <list of .cpp files>
# HDRS <list of .h files>
# DEPENDS <list of dependencies>
# COMPILE_OPTIONS <optional list of special compile options for this target>
# FLAGS <optional list of flags>
# )
function(_build_gpu_object_bundle fq_target_name)
cmake_parse_arguments(
"ADD_GPU_OBJ"
"" # No optional arguments
"NAME;CXX_STANDARD" # Single value arguments
"SRCS;HDRS;DEPENDS;COMPILE_OPTIONS;FLAGS" # Multi value arguments
${ARGN}
)
if(NOT ADD_GPU_OBJ_CXX_STANDARD)
set(ADD_GPU_OBJ_CXX_STANDARD ${CMAKE_CXX_STANDARD})
endif()
foreach(add_gpu_obj_src ${ADD_GPU_OBJ_SRCS})
# The packaged version will be built for every target GPU architecture. We do
# this so we can support multiple accelerators on the same machine.
foreach(gpu_arch ${LIBC_GPU_ARCHITECTURES})
get_filename_component(src_name ${add_gpu_obj_src} NAME)
set(gpu_target_name ${fq_target_name}.${src_name}.${gpu_arch})
_build_gpu_object_for_single_arch(
${gpu_target_name}
${gpu_arch}
CXX_STANDARD ${ADD_GPU_OBJ_CXX_STANDARD}
HDRS ${ADD_GPU_OBJ_HDRS}
SRCS ${add_gpu_obj_src}
COMPILE_OPTIONS
${ADD_GPU_OBJ_COMPILE_OPTIONS}
"-emit-llvm"
DEPENDS ${ADD_GPU_OBJ_DEPENDS}
)
# Append this target to a list of images to package into a single binary.
set(input_file $<TARGET_OBJECTS:${gpu_target_name}>)
if("${gpu_arch}" IN_LIST all_nvptx_architectures)
get_nvptx_compile_options(nvptx_options ${gpu_arch})
string(REGEX MATCH "\\+ptx[0-9]+" nvptx_ptx_feature ${nvptx_options})
list(APPEND packager_images
--image=file=${input_file},arch=${gpu_arch},triple=${NVPTX_TARGET_TRIPLE},feature=${nvptx_ptx_feature})
else()
list(APPEND packager_images
--image=file=${input_file},arch=${gpu_arch},triple=${AMDGPU_TARGET_TRIPLE})
endif()
list(APPEND gpu_target_objects ${input_file})
endforeach()
# After building the target for the desired GPUs we must package the output
# into a fatbinary, see https://clang.llvm.org/docs/OffloadingDesign.html for
# more information.
set(packaged_target_name ${fq_target_name}.${src_name}.__gpu__)
set(packaged_output_name ${CMAKE_CURRENT_BINARY_DIR}/${fq_target_name}.${src_name}.gpubin)
add_custom_command(OUTPUT ${packaged_output_name}
COMMAND ${LIBC_CLANG_OFFLOAD_PACKAGER}
${packager_images} -o ${packaged_output_name}
DEPENDS ${gpu_target_objects} ${add_gpu_obj_src} ${ADD_GPU_OBJ_HDRS}
COMMENT "Packaging LLVM offloading binary")
add_custom_target(${packaged_target_name} DEPENDS ${packaged_output_name})
list(APPEND packaged_gpu_names ${packaged_target_name})
list(APPEND packaged_gpu_binaries ${packaged_output_name})
endforeach()
# We create an empty 'stub' file for the host to contain the embedded device
# code. This will be packaged into 'libcgpu.a'.
# TODO: In the future we will want to combine every architecture for a target
# into a single bitcode file and use that. For now we simply build for
# every single one and let the offloading linker handle it.
string(FIND ${fq_target_name} "." last_dot_loc REVERSE)
math(EXPR name_loc "${last_dot_loc} + 1")
string(SUBSTRING ${fq_target_name} ${name_loc} -1 target_name)
set(stub_filename "${target_name}.cpp")
add_custom_command(
OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/stubs/${stub_filename}"
COMMAND ${CMAKE_COMMAND} -E make_directory ${CMAKE_CURRENT_BINARY_DIR}/stubs/
COMMAND ${CMAKE_COMMAND} -E touch ${CMAKE_CURRENT_BINARY_DIR}/stubs/${stub_filename}
DEPENDS ${gpu_target_objects} ${ADD_GPU_OBJ_SRCS} ${ADD_GPU_OBJ_HDRS}
)
set(stub_target_name ${fq_target_name}.__stub__)
add_custom_target(${stub_target_name} DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/stubs/${stub_filename})
add_library(
${fq_target_name}
# We want an object library as the objects will eventually get packaged into
# an archive (like libcgpu.a).
EXCLUDE_FROM_ALL
OBJECT
${CMAKE_CURRENT_BINARY_DIR}/stubs/${stub_filename}
)
target_compile_options(${fq_target_name} BEFORE PRIVATE
${ADD_GPU_OBJ_COMPILE_OPTIONS} -nostdlib)
foreach(packaged_gpu_binary ${packaged_gpu_binaries})
target_compile_options(${fq_target_name} PRIVATE
"SHELL:-Xclang -fembed-offload-object=${packaged_gpu_binary}")
endforeach()
target_include_directories(${fq_target_name} SYSTEM PRIVATE ${LIBC_INCLUDE_DIR})
target_include_directories(${fq_target_name} PRIVATE ${LIBC_SOURCE_DIR})
add_dependencies(${fq_target_name}
${full_deps_list} ${packaged_gpu_names} ${stub_target_name})
endfunction()
# Rule which is essentially a wrapper over add_library to compile a set of
# sources to object files.
# Usage:
# add_object_library(
# <target_name>
# HDRS <list of header files>
# SRCS <list of source files>
# [ALIAS] <If this object library is an alias for another object library.>
# DEPENDS <list of dependencies; Should be a single item for ALIAS libraries>
# COMPILE_OPTIONS <optional list of special compile options for this target>
# FLAGS <optional list of flags>
function(create_object_library fq_target_name)
cmake_parse_arguments(
"ADD_OBJECT"
"ALIAS;NO_GPU_BUNDLE" # optional arguments
"CXX_STANDARD" # Single value arguments
"SRCS;HDRS;COMPILE_OPTIONS;DEPENDS;FLAGS" # Multivalue arguments
${ARGN}
)
get_fq_deps_list(fq_deps_list ${ADD_OBJECT_DEPENDS})
if(ADD_OBJECT_ALIAS)
if(ADD_OBJECT_SRCS OR ADD_OBJECT_HDRS)
message(FATAL_ERROR
"${fq_target_name}: object library alias cannot have SRCS and/or HDRS.")
endif()
list(LENGTH fq_deps_list depends_size)
if(NOT ${depends_size} EQUAL 1)
message(FATAL_ERROR
"${fq_targe_name}: object library alias should have exactly one DEPENDS.")
endif()
add_library(
${fq_target_name}
ALIAS
${fq_deps_list}
)
return()
endif()
if(NOT ADD_OBJECT_SRCS)
message(FATAL_ERROR "'add_object_library' rule requires SRCS to be specified.")
endif()
# The GPU build uses a separate internal file.
if(LIBC_TARGET_ARCHITECTURE_IS_GPU AND NOT ${ADD_OBJECT_NO_GPU_BUNDLE})
set(internal_target_name ${fq_target_name}.__internal__)
set(public_packaging_for_internal "")
else()
set(internal_target_name ${fq_target_name})
set(public_packaging_for_internal "-DLIBC_COPT_PUBLIC_PACKAGING")
endif()
_get_common_compile_options(compile_options "${ADD_OBJECT_FLAGS}")
list(APPEND compile_options ${ADD_OBJECT_COMPILE_OPTIONS})
# GPU builds require special handling for the objects because we want to
# export several different targets at once, e.g. for both Nvidia and AMD.
if(LIBC_TARGET_ARCHITECTURE_IS_GPU)
if(NOT ${ADD_OBJECT_NO_GPU_BUNDLE})
_build_gpu_object_bundle(
${fq_target_name}
SRCS ${ADD_OBJECT_SRCS}
HDRS ${ADD_OBJECT_HDRS}
CXX_STANDARD ${ADD_OBJECT_CXX_STANDARD}
COMPILE_OPTIONS ${compile_options} "-DLIBC_COPT_PUBLIC_PACKAGING"
DEPENDS ${fq_deps_list}
)
endif()
# When the target for GPU is not bundled, internal_target_name is the same
# as fq_targetname
_build_gpu_object_for_single_arch(
${internal_target_name}
${LIBC_GPU_TARGET_ARCHITECTURE}
SRCS ${ADD_OBJECT_SRCS}
HDRS ${ADD_OBJECT_HDRS}
CXX_STANDARD ${ADD_OBJECT_CXX_STANDARD}
COMPILE_OPTIONS ${compile_options} ${public_packaging_for_internal}
DEPENDS ${fq_deps_list}
)
else()
add_library(
${fq_target_name}
EXCLUDE_FROM_ALL
OBJECT
${ADD_OBJECT_SRCS}
${ADD_OBJECT_HDRS}
)
target_include_directories(${fq_target_name} SYSTEM PRIVATE ${LIBC_INCLUDE_DIR})
target_include_directories(${fq_target_name} PRIVATE ${LIBC_SOURCE_DIR})
target_compile_options(${fq_target_name} PRIVATE ${compile_options})
endif()
if(SHOW_INTERMEDIATE_OBJECTS)
message(STATUS "Adding object library ${fq_target_name}")
if(${SHOW_INTERMEDIATE_OBJECTS} STREQUAL "DEPS")
foreach(dep IN LISTS ADD_OBJECT_DEPENDS)
message(STATUS " ${fq_target_name} depends on ${dep}")
endforeach()
endif()
endif()
if(fq_deps_list)
add_dependencies(${fq_target_name} ${fq_deps_list})
# Add deps as link libraries to inherit interface compile and link options.
target_link_libraries(${fq_target_name} PUBLIC ${fq_deps_list})
endif()
if(NOT ADD_OBJECT_CXX_STANDARD)
set(ADD_OBJECT_CXX_STANDARD ${CMAKE_CXX_STANDARD})
endif()
set_target_properties(
${fq_target_name}
PROPERTIES
TARGET_TYPE ${OBJECT_LIBRARY_TARGET_TYPE}
CXX_STANDARD ${ADD_OBJECT_CXX_STANDARD}
DEPS "${fq_deps_list}"
FLAGS "${ADD_OBJECT_FLAGS}"
)
if(TARGET ${internal_target_name})
set_target_properties(
${fq_target_name}
PROPERTIES
OBJECT_FILES "$<TARGET_OBJECTS:${internal_target_name}>"
)
endif()
endfunction(create_object_library)
function(add_object_library target_name)
add_target_with_flags(
${target_name}
CREATE_TARGET create_object_library
${ARGN})
endfunction(add_object_library)
set(ENTRYPOINT_OBJ_TARGET_TYPE "ENTRYPOINT_OBJ")
set(ENTRYPOINT_OBJ_VENDOR_TARGET_TYPE "ENTRYPOINT_OBJ_VENDOR")
# A rule for entrypoint object targets.
# Usage:
# add_entrypoint_object(
# <target_name>
# [ALIAS|REDIRECTED] # Specified if the entrypoint is redirected or an alias.
# [NAME] <the C name of the entrypoint if different from target_name>
# SRCS <list of .cpp files>
# HDRS <list of .h files>
# DEPENDS <list of dependencies>
# COMPILE_OPTIONS <optional list of special compile options for this target>
# SPECIAL_OBJECTS <optional list of special object targets added by the rule `add_object`>
# FLAGS <optional list of flags>
# )
function(create_entrypoint_object fq_target_name)
cmake_parse_arguments(
"ADD_ENTRYPOINT_OBJ"
"ALIAS;REDIRECTED;VENDOR" # Optional argument
"NAME;CXX_STANDARD" # Single value arguments
"SRCS;HDRS;DEPENDS;COMPILE_OPTIONS;FLAGS" # Multi value arguments
${ARGN}
)
set(entrypoint_target_type ${ENTRYPOINT_OBJ_TARGET_TYPE})
if(${ADD_ENTRYPOINT_OBJ_VENDOR})
# TODO: We currently rely on external definitions of certain math functions
# provided by GPU vendors like AMD or Nvidia. We need to mark these so we
# don't end up running tests on these. In the future all of these should be
# implemented and this can be removed.
set(entrypoint_target_type ${ENTRYPOINT_OBJ_VENDOR_TARGET_TYPE})
endif()
list(FIND TARGET_ENTRYPOINT_NAME_LIST ${ADD_ENTRYPOINT_OBJ_NAME} entrypoint_name_index)
if(${entrypoint_name_index} EQUAL -1)
add_custom_target(${fq_target_name})
set_target_properties(
${fq_target_name}
PROPERTIES
"ENTRYPOINT_NAME" ${ADD_ENTRYPOINT_OBJ_NAME}
"TARGET_TYPE" ${entrypoint_target_type}
"OBJECT_FILE" ""
"OBJECT_FILE_RAW" ""
"DEPS" ""
"SKIPPED" "YES"
)
if(LIBC_CMAKE_VERBOSE_LOGGING)
message(STATUS "Skipping libc entrypoint ${fq_target_name}.")
endif()
return()
endif()
set(internal_target_name ${fq_target_name}.__internal__)
if(ADD_ENTRYPOINT_OBJ_ALIAS)
# Alias targets help one add aliases to other entrypoint object targets.
# One can use alias targets setup OS/machine independent entrypoint targets.
list(LENGTH ADD_ENTRYPOINT_OBJ_DEPENDS deps_size)
if(NOT (${deps_size} EQUAL "1"))
message(FATAL_ERROR "An entrypoint alias should have exactly one dependency.")
endif()
list(GET ADD_ENTRYPOINT_OBJ_DEPENDS 0 dep_target)
get_fq_dep_name(fq_dep_name ${dep_target})
if(SHOW_INTERMEDIATE_OBJECTS)
message(STATUS "Adding entrypoint object ${fq_target_name} as an alias of"
" ${fq_dep_name}")
endif()
if(NOT TARGET ${fq_dep_name})
message(WARNING "Aliasee ${fq_dep_name} for entrypoint alias ${target_name} missing; "
"Target ${target_name} will be ignored.")
return()
endif()
get_target_property(obj_type ${fq_dep_name} "TARGET_TYPE")
if((NOT obj_type) OR (NOT (${obj_type} STREQUAL ${ENTRYPOINT_OBJ_TARGET_TYPE} OR
${obj_type} STREQUAL ${ENTRYPOINT_OBJ_VENDOR_TARGET_TYPE})))
message(FATAL_ERROR "The aliasee of an entrypoint alias should be an entrypoint.")
endif()
get_target_property(object_file ${fq_dep_name} "OBJECT_FILE")
get_target_property(object_file_raw ${fq_dep_name} "OBJECT_FILE_RAW")
add_library(
${internal_target_name}
EXCLUDE_FROM_ALL
OBJECT
${object_file_raw}
)
add_dependencies(${internal_target_name} ${fq_dep_name})
add_library(
${fq_target_name}
EXCLUDE_FROM_ALL
OBJECT
${object_file}
)
add_dependencies(${fq_target_name} ${fq_dep_name} ${internal_target_name})
set_target_properties(
${fq_target_name}
PROPERTIES
ENTRYPOINT_NAME ${ADD_ENTRYPOINT_OBJ_NAME}
TARGET_TYPE ${entrypoint_target_type}
IS_ALIAS "YES"
OBJECT_FILE ""
OBJECT_FILE_RAW ""
DEPS "${fq_dep_name}"
FLAGS "${ADD_ENTRYPOINT_OBJ_FLAGS}"
)
return()
endif()
if(NOT ADD_ENTRYPOINT_OBJ_SRCS)
message(FATAL_ERROR "`add_entrypoint_object` rule requires SRCS to be specified.")
endif()
if(NOT ADD_ENTRYPOINT_OBJ_HDRS)
message(FATAL_ERROR "`add_entrypoint_object` rule requires HDRS to be specified.")
endif()
if(NOT ADD_ENTRYPOINT_OBJ_CXX_STANDARD)
set(ADD_ENTRYPOINT_OBJ_CXX_STANDARD ${CMAKE_CXX_STANDARD})
endif()
_get_common_compile_options(common_compile_options "${ADD_ENTRYPOINT_OBJ_FLAGS}")
list(APPEND common_compile_options ${ADD_ENTRYPOINT_OBJ_COMPILE_OPTIONS})
get_fq_deps_list(fq_deps_list ${ADD_ENTRYPOINT_OBJ_DEPENDS})
set(full_deps_list ${fq_deps_list} libc.src.__support.common)
if(SHOW_INTERMEDIATE_OBJECTS)
message(STATUS "Adding entrypoint object ${fq_target_name}")
if(${SHOW_INTERMEDIATE_OBJECTS} STREQUAL "DEPS")
foreach(dep IN LISTS ADD_ENTRYPOINT_OBJ_DEPENDS)
message(STATUS " ${fq_target_name} depends on ${dep}")
endforeach()
endif()
endif()
# GPU builds require special handling for the objects because we want to
# export several different targets at once, e.g. for both Nvidia and AMD.
if(LIBC_TARGET_ARCHITECTURE_IS_GPU)
_build_gpu_object_bundle(
${fq_target_name}
SRCS ${ADD_ENTRYPOINT_OBJ_SRCS}
HDRS ${ADD_ENTRYPOINT_OBJ_HDRS}
COMPILE_OPTIONS ${common_compile_options} "-DLIBC_COPT_PUBLIC_PACKAGING"
CXX_STANDARD ${ADD_ENTRYPOINT_OBJ_CXX_STANDARD}
DEPENDS ${full_deps_list}
FLAGS "${ADD_ENTRYPOINT_OBJ_FLAGS}"
)
_build_gpu_object_for_single_arch(
${internal_target_name}
${LIBC_GPU_TARGET_ARCHITECTURE}
SRCS ${ADD_ENTRYPOINT_OBJ_SRCS}
HDRS ${ADD_ENTRYPOINT_OBJ_HDRS}
COMPILE_OPTIONS ${common_compile_options}
CXX_STANDARD ${ADD_ENTRYPOINT_OBJ_CXX_STANDARD}
DEPENDS ${full_deps_list}
FLAGS "${ADD_ENTRYPOINT_OBJ_FLAGS}"
)
else()
add_library(
${internal_target_name}
# TODO: We don't need an object library for internal consumption.
# A future change should switch this to a normal static library.
EXCLUDE_FROM_ALL
OBJECT
${ADD_ENTRYPOINT_OBJ_SRCS}
${ADD_ENTRYPOINT_OBJ_HDRS}
)
target_compile_options(${internal_target_name} BEFORE PRIVATE ${common_compile_options})
target_include_directories(${internal_target_name} SYSTEM PRIVATE ${LIBC_INCLUDE_DIR})
target_include_directories(${internal_target_name} PRIVATE ${LIBC_SOURCE_DIR})
add_dependencies(${internal_target_name} ${full_deps_list})
target_link_libraries(${internal_target_name} ${full_deps_list})
add_library(
${fq_target_name}
# We want an object library as the objects will eventually get packaged into
# an archive (like libc.a).
EXCLUDE_FROM_ALL
OBJECT
${ADD_ENTRYPOINT_OBJ_SRCS}
${ADD_ENTRYPOINT_OBJ_HDRS}
)
target_compile_options(${fq_target_name} BEFORE PRIVATE ${common_compile_options} -DLIBC_COPT_PUBLIC_PACKAGING)
target_include_directories(${fq_target_name} SYSTEM PRIVATE ${LIBC_INCLUDE_DIR})
target_include_directories(${fq_target_name} PRIVATE ${LIBC_SOURCE_DIR})
add_dependencies(${fq_target_name} ${full_deps_list})
target_link_libraries(${fq_target_name} ${full_deps_list})
endif()
set_target_properties(
${fq_target_name}
PROPERTIES
ENTRYPOINT_NAME ${ADD_ENTRYPOINT_OBJ_NAME}
TARGET_TYPE ${ENTRYPOINT_OBJ_TARGET_TYPE}
OBJECT_FILE "$<TARGET_OBJECTS:${fq_target_name}>"
CXX_STANDARD ${ADD_ENTRYPOINT_OBJ_CXX_STANDARD}
DEPS "${fq_deps_list}"
FLAGS "${ADD_ENTRYPOINT_OBJ_FLAGS}"
)
if(TARGET ${internal_target_name})
set_target_properties(
${internal_target_name}
PROPERTIES
CXX_STANDARD ${ADD_ENTRYPOINT_OBJ_CXX_STANDARD}
FLAGS "${ADD_ENTRYPOINT_OBJ_FLAGS}"
)
set_target_properties(
${fq_target_name}
PROPERTIES
# TODO: We don't need to list internal object files if the internal
# target is a normal static library.
OBJECT_FILE_RAW "$<TARGET_OBJECTS:${internal_target_name}>"
)
endif()
if(LLVM_LIBC_ENABLE_LINTING AND TARGET ${internal_target_name})
if(NOT LLVM_LIBC_CLANG_TIDY)
message(FATAL_ERROR "Something is wrong! LLVM_LIBC_ENABLE_LINTING is "
"ON but LLVM_LIBC_CLANG_TIDY is not set.")
endif()
# We only want a second invocation of clang-tidy to run
# restrict-system-libc-headers if the compiler-resource-dir was set in
# order to prevent false-positives due to a mismatch between the host
# compiler and the compiled clang-tidy.
if(COMPILER_RESOURCE_DIR)
# We run restrict-system-libc-headers with --system-headers to prevent
# transitive inclusion through compler provided headers.
set(restrict_system_headers_check_invocation
COMMAND ${LLVM_LIBC_CLANG_TIDY} --system-headers
--checks="-*,llvmlibc-restrict-system-libc-headers"
# We explicitly set the resource dir here to match the
# resource dir of the host compiler.
"--extra-arg=-resource-dir=${COMPILER_RESOURCE_DIR}"
--quiet
-p ${PROJECT_BINARY_DIR}
${ADD_ENTRYPOINT_OBJ_SRCS}
)
else()
set(restrict_system_headers_check_invocation
COMMAND ${CMAKE_COMMAND} -E echo "Header file check skipped")
endif()
add_custom_target(
${fq_target_name}.__lint__
# --quiet is used to surpress warning statistics from clang-tidy like:
# Suppressed X warnings (X in non-user code).
# There seems to be a bug in clang-tidy where by even with --quiet some
# messages from clang's own diagnostics engine leak through:
# X warnings generated.
# Until this is fixed upstream, we use -fno-caret-diagnostics to surpress
# these.
COMMAND ${LLVM_LIBC_CLANG_TIDY}
"--extra-arg=-fno-caret-diagnostics" --quiet
# Path to directory containing compile_commands.json
-p ${PROJECT_BINARY_DIR}
${ADD_ENTRYPOINT_OBJ_SRCS}
# See above: this might be a second invocation of clang-tidy depending on
# the conditions above.
${restrict_system_headers_check_invocation}
# We have two options for running commands, add_custom_command and
# add_custom_target. We don't want to run the linter unless source files
# have changed. add_custom_target explicitly runs everytime therefore we
# use add_custom_command. This function requires an output file and since
# linting doesn't produce a file, we create a dummy file using a
# crossplatform touch.
COMMENT "Linting... ${fq_target_name}"
DEPENDS ${internal_target_name} ${ADD_ENTRYPOINT_OBJ_SRCS}
WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
)
add_dependencies(libc-lint ${fq_target_name}.__lint__)
endif()
endfunction(create_entrypoint_object)
function(add_entrypoint_object target_name)
cmake_parse_arguments(
"ADD_ENTRYPOINT_OBJ"
"" # Optional arguments
"NAME" # Single value arguments
"" # Multi-value arguments
${ARGN}
)
if(NOT ADD_ENTRYPOINT_OBJ_NAME)
set(ADD_ENTRYPOINT_OBJ_NAME ${target_name})
endif()
add_target_with_flags(
${target_name}
NAME ${ADD_ENTRYPOINT_OBJ_NAME}
CREATE_TARGET create_entrypoint_object
${ADD_ENTRYPOINT_OBJ_UNPARSED_ARGUMENTS}
)
endfunction(add_entrypoint_object)
set(ENTRYPOINT_EXT_TARGET_TYPE "ENTRYPOINT_EXT")
# A rule for external entrypoint targets.
# Usage:
# add_entrypoint_external(
# <target_name>
# DEPENDS <list of dependencies>
# )
function(add_entrypoint_external target_name)
cmake_parse_arguments(
"ADD_ENTRYPOINT_EXT"
"" # No optional arguments
"" # No single value arguments
"DEPENDS" # Multi value arguments
${ARGN}
)
get_fq_target_name(${target_name} fq_target_name)
set(entrypoint_name ${target_name})
add_custom_target(${fq_target_name})
set_target_properties(
${fq_target_name}
PROPERTIES
"ENTRYPOINT_NAME" ${entrypoint_name}
"TARGET_TYPE" ${ENTRYPOINT_EXT_TARGET_TYPE}
"DEPS" "${ADD_ENTRYPOINT_EXT_DEPENDS}"
)
endfunction(add_entrypoint_external)
# Rule build a redirector object file.
function(add_redirector_object target_name)
cmake_parse_arguments(
"REDIRECTOR_OBJECT"
"" # No optional arguments
"SRC" # The cpp file in which the redirector is defined.
"" # No multivalue arguments
${ARGN}
)
if(NOT REDIRECTOR_OBJECT_SRC)
message(FATAL_ERROR "'add_redirector_object' rule requires SRC option listing one source file.")
endif()
add_library(
${target_name}
EXCLUDE_FROM_ALL
OBJECT
${REDIRECTOR_OBJECT_SRC}
)
target_compile_options(
${target_name}
BEFORE PRIVATE -fPIC ${LIBC_COMPILE_OPTIONS_DEFAULT}
)
endfunction(add_redirector_object)
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