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# This is a helper function and not a build rule. It is to be used by the
# the "add_entrypoint_library" rule to generate the full list of object files
# recursively produced by "add_object_library" targets upstream in the
# dependency tree. This function traverses up through the
# "add_entrypoint_object" targets but does not collect the object files
# produced by them.
# Usage:
# get_object_files_for_test(<result var> <target0> [<target1> ...])
#
# targetN is either an "add_entrypoint_target" target or an
# "add_object_library" target.
function(get_object_files_for_entrypoint_library result)
set(object_files "")
foreach(dep IN LISTS ARGN)
get_target_property(dep_type ${dep} "TARGET_TYPE")
if (NOT dep_type)
continue()
endif()
if(${dep_type} STREQUAL ${OBJECT_LIBRARY_TARGET_TYPE})
get_target_property(dep_object_files ${dep} "OBJECT_FILES")
if(dep_object_files)
list(APPEND object_files ${dep_object_files})
endif()
endif()
get_target_property(indirect_deps ${dep} "DEPS")
get_object_files_for_entrypoint_library(indirect_objfiles ${indirect_deps})
list(APPEND object_files ${indirect_objfiles})
endforeach(dep)
list(REMOVE_DUPLICATES object_files)
set(${result} ${object_files} PARENT_SCOPE)
endfunction()
# This is a helper function and not a build rule. Given an entrypoint object
# target, it returns the object file produced by this target in |result|.
# If the given entrypoint target is an alias, then it traverses up to the
# aliasee to get the object file.
function(get_entrypoint_object_file entrypoint_target result)
get_target_property(target_type ${entrypoint_target} "TARGET_TYPE")
if(NOT (${target_type} STREQUAL ${ENTRYPOINT_OBJ_TARGET_TYPE}))
message(FATAL_ERROR
"Expected an target added using `add_entrypoint_object` rule.")
endif()
get_target_property(objfile ${entrypoint_target} "OBJECT_FILE")
if(objfile)
set(${result} ${objfile} PARENT_SCOPE)
return()
endif()
# If the entrypoint is an alias, fetch the object file from the aliasee.
get_target_property(is_alias ${entrypoint_target} "IS_ALIAS")
if(is_alias)
get_target_property(aliasee ${entrypoint_target} "DEPS")
if(NOT aliasee)
message(FATAL_ERROR
"Entrypoint alias ${entrypoint_target} does not have an aliasee.")
endif()
get_entrypoint_object_file(${aliasee} objfile)
set(${result} ${objfile} PARENT_SCOPE)
return()
endif()
message(FATAL_ERROR
"Entrypoint ${entrypoint_target} does not produce an object file.")
endfunction(get_entrypoint_object_file)
# A rule to build a library from a collection of entrypoint objects.
# Usage:
# add_entrypoint_library(
# DEPENDS <list of add_entrypoint_object targets>
# )
#
# NOTE: If one wants an entrypoint to be availabe in a library, then they will
# have to list the entrypoint target explicitly in the DEPENDS list. Implicit
# entrypoint dependencies will not be added to the library.
function(add_entrypoint_library target_name)
cmake_parse_arguments(
"ENTRYPOINT_LIBRARY"
"" # No optional arguments
"" # No single value arguments
"DEPENDS" # Multi-value arguments
${ARGN}
)
if(NOT ENTRYPOINT_LIBRARY_DEPENDS)
message(FATAL_ERROR "'add_entrypoint_library' target requires a DEPENDS list "
"of 'add_entrypoint_object' targets.")
endif()
get_fq_deps_list(fq_deps_list ${ENTRYPOINT_LIBRARY_DEPENDS})
get_object_files_for_entrypoint_library(obj_list ${fq_deps_list})
foreach(dep IN LISTS fq_deps_list)
get_target_property(dep_type ${dep} "TARGET_TYPE")
if(NOT (${dep_type} STREQUAL ${ENTRYPOINT_OBJ_TARGET_TYPE}))
message(FATAL_ERROR "Dependency '${dep}' of 'add_entrypoint_collection' is "
"not an 'add_entrypoint_object' target.")
endif()
get_entrypoint_object_file(${dep} objfile)
list(APPEND obj_list ${objfile})
endforeach(dep)
list(REMOVE_DUPLICATES obj_list)
set(library_file "${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_STATIC_LIBRARY_PREFIX}${target_name}${CMAKE_STATIC_LIBRARY_SUFFIX}")
add_custom_command(
OUTPUT ${library_file}
COMMAND ${CMAKE_AR} -r ${library_file} ${obj_list}
DEPENDS ${obj_list}
)
add_custom_target(
${target_name}
ALL
DEPENDS ${library_file}
)
endfunction(add_entrypoint_library)
# Rule to build a shared library of redirector objects.
function(add_redirector_library target_name)
cmake_parse_arguments(
"REDIRECTOR_LIBRARY"
""
""
"DEPENDS"
${ARGN}
)
set(obj_files "")
foreach(dep IN LISTS REDIRECTOR_LIBRARY_DEPENDS)
# TODO: Ensure that each dep is actually a add_redirector_object target.
list(APPEND obj_files $<TARGET_OBJECTS:${dep}>)
endforeach(dep)
# TODO: Call the linker explicitly instead of calling the compiler driver to
# prevent DT_NEEDED on C++ runtime.
add_library(
${target_name}
SHARED
${obj_files}
)
set_target_properties(${target_name} PROPERTIES LIBRARY_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
target_link_libraries(
${target_name}
-nostdlib -lc -lm
)
set_target_properties(
${target_name}
PROPERTIES
LINKER_LANGUAGE "C"
)
endfunction(add_redirector_library)
set(HDR_LIBRARY_TARGET_TYPE "HDR_LIBRARY")
# Rule to add header only libraries.
# Usage
# add_header_library(
# <target name>
# HDRS <list of .h files part of the library>
# DEPENDS <list of dependencies>
# )
function(add_header_library target_name)
cmake_parse_arguments(
"ADD_HEADER"
"" # No optional arguments
"" # No Single value arguments
"HDRS;DEPENDS" # Multi-value arguments
${ARGN}
)
if(NOT ADD_HEADER_HDRS)
message(FATAL_ERROR "'add_header_library' target requires a HDRS list of .h files.")
endif()
get_fq_target_name(${target_name} fq_target_name)
set(FULL_HDR_PATHS "")
# TODO: Remove this foreach block when we can switch to the new
# version of the CMake policy CMP0076.
foreach(hdr IN LISTS ADD_HEADER_HDRS)
list(APPEND FULL_HDR_PATHS ${CMAKE_CURRENT_SOURCE_DIR}/${hdr})
endforeach()
set(interface_target_name "${fq_target_name}.__header_library__")
add_library(${interface_target_name} INTERFACE)
target_sources(${interface_target_name} INTERFACE ${FULL_HDR_PATHS})
get_fq_deps_list(fq_deps_list ${ADD_HEADER_DEPENDS})
if(ADD_HEADER_DEPENDS)
add_dependencies(${interface_target_name} ${fq_deps_list})
endif()
add_custom_target(${fq_target_name})
add_dependencies(${fq_target_name} ${interface_target_name})
set_target_properties(
${fq_target_name}
PROPERTIES
"TARGET_TYPE" "${HDR_LIBRARY_TARGET_TYPE}"
"DEPS" "${fq_deps_list}"
)
endfunction(add_header_library)
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