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add_target.cmake
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add_target.cmake
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cmake_minimum_required(VERSION 3.18)
if (COMMAND add_target)
message(WARNING "add_target function already exists, breaking early instead of overriding.")
return()
endif()
function(add_target target_name)
if (TARGET ${target_name})
message(FATAL_ERROR "${CMAKE_CURRENT_FUNCTION}: Cannot add target ${target_name} because it already exists.")
endif()
set(options "STATIC;SHARED;EXECUTALBE;HEADER_ONLY")
set(multivalue_keywords "INCLUDES;DEPENDENCIES;OPTIONS;DEFINITIONS;BOOST_TEST;GOOGLE_TEST")
cmake_parse_arguments(PARSE_ARGV 1 io1
"${options}"
""
"${multivalue_keywords}"
)
# options are mutually exclusive
# the found_options list must have length one
# at the end of this loop
foreach(option IN LISTS options)
if (io1_${option})
list(APPEND found_option ${option})
endif()
endforeach()
list(LENGTH found_option found_option_count)
if (found_option_count EQUAL 0)
message(FATAL_ERROR "${CMAKE_CURRENT_FUNCTION}: missing target type.")
elseif (NOT found_option_count EQUAL 1)
message(FATAL_ERROR "${CMAKE_CURRENT_FUNCTION}: cannot define multiple target types.")
endif()
# target sources are the leftover values
fetch_source_files(sources ${io1_UNPARSED_ARGUMENTS})
# create the target with the type detected by found_option
if (DEFINED io1_STATIC)
add_library(${target_name} STATIC ${sources})
elseif(DEFINED io1_SHARED)
add_library(${target_name} SHARED ${sources})
elseif(DEFINED io1_EXECUTABLE)
add_executable(${target_name} ${sources})
elseif(DEFINED io1_HEADER_ONLY)
add_library(${target_name} INTERFACE ${sources})
endif()
# apply source files properties and groups
apply_source_groups(${io1_UNPARSED_ARGUMENTS})
apply_source_files_properties(${io1_UNPARSED_ARGUMENTS})
message(STATUS "${CMAKE_CURRENT_FUNCTION}: created ${found_option} target ${target_name}.")
# configure the target from the multi-value keywords
if (DEFINED io1_INCLUDES)
target_include_directories(${target_name} ${io1_INCLUDES})
endif()
if (DEFINED io1_DEPENDENCIES)
target_link_libraries(${target_name} ${io1_DEPENDENCIES})
endif()
if (DEFINED io1_OPTIONS)
target_compile_options(${target_name} ${io1_OPTIONS})
endif()
if(DEFINED io1_DEFINITIONS)
target_compile_definitions(${target_name} ${io1_DEFINITIONS})
endif()
if(DEFINED io1_BOOST_TEST AND BUILD_TESTING)
set(test_name "boost-test-${target_name}")
if (TARGET ${test_name})
message(FATAL_ERROR "${CMAKE_CURRENT_FUNCTION}: cannot create boost test target ${test_name} because it already exists.")
else()
message(STATUS "${CMAKE_CURRENT_FUNCTION}: created boost test target ${test_name}.")
endif()
find_package(Boost REQUIRED COMPONENTS unit_test_framework)
add_executable(${test_name} ${test_sources})
target_link_libraries(${test_name} PRIVATE ${target_name} Boost::unit_test_framework)
add_test(
NAME ${test_name}
COMMAND ${test_name} --catch_system_error=yes --detect_memory_leaks --logger=JUNIT,all,junit_${test_name}.xml
WORKING_DIRECTORY $<TARGET_FILE_DIR:${test_name}>)
endif()
if(DEFINED io1_GOOGLE_TEST AND BUILD_TESTING)
if (NOT COMMAND gtest_discover_tests)
include(GoogleTest)
endif()
set(test_name "google-test-${target_name}")
if (TARGET ${test_name})
message(FATAL_ERROR "${CMAKE_CURRENT_FUNCTION}: cannot create google test target ${test_name} because it already exists.")
else()
message(STATUS "${CMAKE_CURRENT_FUNCTION}: created google test target ${test_name}.")
endif()
find_package(GTest REQUIRED)
add_executable(${test_name} ${test_sources})
target_link_libraries(${test_name} PRIVATE ${target_name} GTest::Main)
gtest_discover_tests(${test_name}
WORKING_DIRECTORY $<TARGET_FILE_DIR:${test_name}>
)
endif()
endfunction()
set(source_group_regex "^(.*)//$")
set(source_file_properties_regex "^(.*):(.*)$")
function(apply_source_groups)
fetch_source_groups(sources groups ${ARGN})
foreach(source group IN ZIP_LISTS sources groups)
source_group(NAME "${group}" FILES "${source}")
endforeach()
endfunction()
function(fetch_source_groups out_sources out_groups)
set(current_group_name ".")
set(current_group_path "/.")
foreach(file IN LISTS ARGN)
if ("${file}" MATCHES "${source_group_regex}")
set(new_group_path "${CMAKE_MATCH_1}")
if (IS_ABSOLUTE "${new_group_path}")
set(current_group_path "${new_group_path}")
else()
get_filename_component(current_group_path "${new_group_path}" ABSOLUTE BASE_DIR "${current_group_path}")
endif()
string(SUBSTRING "${current_group_path}" 1 -1 current_group_name)
elseif (NOT "${current_group_name}" STREQUAL ".")
list(APPEND temp_out_groups "${current_group_name}")
if ("${file}" MATCHES "${source_file_properties_regex}")
list(APPEND temp_out_sources "${CMAKE_MATCH_1}")
else()
list(APPEND temp_out_sources "${file}")
endif()
endif()
endforeach()
set(${out_sources} "${temp_out_sources}" PARENT_SCOPE)
set(${out_groups} "${temp_out_groups}" PARENT_SCOPE)
endfunction()
# strip out groups strings and source file properties
function(fetch_source_files out_sources)
foreach(str IN LISTS ARGN)
if ("${str}" MATCHES "${source_group_regex}")
continue()
endif()
if("${str}" MATCHES "${source_file_properties_regex}")
list(APPEND temp_out_sources "${CMAKE_MATCH_1}")
else()
list(APPEND temp_out_sources "${str}")
endif()
endforeach()
set(${out_sources} "${temp_out_sources}" PARENT_SCOPE)
endfunction()
function(apply_source_files_properties)
foreach(str IN LISTS ARGN)
if ("${str}" MATCHES "${source_group_regex}")
continue()
endif()
parse_file_options("${str}" file options)
cmake_parse_arguments(io1 "cpp;header" "" "" ${options})
if (DEFINED io1_cpp)
set_source_files_properties("${file}" PROPERTIES LANGUAGE CXX)
endif()
if (DEFINED io1_header)
set_source_files_properties("${file}" PROPERTIES HEADER_FILE_ONLY ON)
endif()
endforeach()
endfunction()
# expects "file.c[:opt1,opt2,opt3,...]" and parse it into "file.c" and the list "opt1;opt2;opt3"
function(parse_file_options str out_file out_options)
if ("${str}" MATCHES "${source_file_properties_regex}")
set(${out_file} "${CMAKE_MATCH_1}" PARENT_SCOPE)
string(REPLACE "," ";" temp_out_options "${CMAKE_MATCH_2}")
set(${out_options} "${temp_out_options}" PARENT_SCOPE)
else()
set(${out_file} "${str}" PARENT_SCOPE)
unset(${out_options} PARENT_SCOPE)
endif()
endfunction()