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#######################################################################
# The Embedded Template Library (https://www.etlcpp.com/)
#######################################################################
cmake_minimum_required(VERSION 3.5.0)
include(${CMAKE_CURRENT_SOURCE_DIR}/cmake/helpers.cmake)
set(MSG_PREFIX "etl |")
project(etl VERSION ${ETL_VERSION} LANGUAGES CXX)
option(BUILD_TESTS "Build unit tests" OFF)
option(NO_STL "No STL" OFF)
# There is a bug on old gcc versions for some targets that causes all system headers
# to be implicitly wrapped with 'extern "C"'
# Users can add set(NO_SYSTEM_INCLUDE ON) to their top level CMakeLists.txt to work around this.
option(NO_SYSTEM_INCLUDE "Do not include with -isystem" OFF)
if (NO_SYSTEM_INCLUDE)
set(INCLUDE_SPECIFIER "")
else()
set(INCLUDE_SPECIFIER "SYSTEM")
endif()
add_library(${PROJECT_NAME} INTERFACE)
# This allows users which use the add_subdirectory or FetchContent
# to use the same target as users which use find_package
add_library(etl::etl ALIAS ${PROJECT_NAME})
include(GNUInstallDirs)
target_include_directories(${PROJECT_NAME} ${INCLUDE_SPECIFIER} INTERFACE
$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
)
target_link_libraries(${PROJECT_NAME} INTERFACE)
# only install if top level project
if(${CMAKE_PROJECT_NAME} STREQUAL ${PROJECT_NAME})
# Steps here based on excellent guide: https://dominikberner.ch/cmake-interface-lib/
# Which also details all steps
include(CMakePackageConfigHelpers)
install(TARGETS ${PROJECT_NAME}
EXPORT ${PROJECT_NAME}Targets
ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
)
if(ETL_VERSION)
# Generate the package configuration files using CMake provided macros
write_basic_package_version_file(
"${PROJECT_NAME}ConfigVersion.cmake"
COMPATIBILITY SameMajorVersion
ARCH_INDEPENDENT
)
endif()
configure_package_config_file(
"${PROJECT_SOURCE_DIR}/cmake/${PROJECT_NAME}Config.cmake.in"
"${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
INSTALL_DESTINATION
${CMAKE_INSTALL_DATAROOTDIR}/${PROJECT_NAME}/cmake)
# Install target file, then package configuration files, and finally the headers
install(EXPORT ${PROJECT_NAME}Targets
FILE ${PROJECT_NAME}Targets.cmake
NAMESPACE ${PROJECT_NAME}::
DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/${PROJECT_NAME}/cmake)
install(FILES "${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
"${PROJECT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake"
DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/${PROJECT_NAME}/cmake)
install(DIRECTORY ${PROJECT_SOURCE_DIR}/include/etl DESTINATION include)
endif()
if (BUILD_TESTS)
enable_testing()
add_subdirectory(test)
endif()
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