CMakeLists.txt

# Copyright (c) 2019 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.

cmake_minimum_required(VERSION 3.8)

project("Libmultiprocess" CXX)
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED YES)

include("cmake/compat_find.cmake")

find_package(CapnProto REQUIRED)
find_package(Threads REQUIRED)

option(Libmultiprocess_ENABLE_CLANG_TIDY "Run clang-tidy with the compiler." OFF)
if(Libmultiprocess_ENABLE_CLANG_TIDY)
  find_program(CLANG_TIDY_EXECUTABLE NAMES clang-tidy)
  if(NOT CLANG_TIDY_EXECUTABLE)
    message(FATAL_ERROR "Libmultiprocess_ENABLE_CLANG_TIDY is ON but clang-tidy is not found.")
  endif()
  set(CMAKE_CXX_CLANG_TIDY "${CLANG_TIDY_EXECUTABLE}")
endif()

include("cmake/compat_config.cmake")
include("cmake/pthread_checks.cmake")
include(GNUInstallDirs)

# Generated C++ preprocessor defines
configure_file(include/mp/config.h.in "${CMAKE_CURRENT_BINARY_DIR}/include/mp/config.h")

# Generated C++ Capn'Proto schema files
capnp_generate_cpp(MP_PROXY_SRCS MP_PROXY_HDRS include/mp/proxy.capnp)

# util library
add_library(util OBJECT src/mp/util.cpp)
target_include_directories(util PRIVATE
  $<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}/include>
  $<BUILD_INTERFACE:${CMAKE_BINARY_DIR}/include>
  ${CAPNP_INCLUDE_DIRECTORY})

# libmultiprocess.a runtime library
set(MP_PUBLIC_HEADERS
  ${MP_PROXY_HDRS}
  include/mp/proxy-io.h
  include/mp/proxy-types.h
  include/mp/proxy.h
  include/mp/util.h)
add_library(multiprocess STATIC
  ${MP_PROXY_SRCS}
  ${MP_PUBLIC_HEADERS}
  src/mp/proxy.cpp
  $<TARGET_OBJECTS:util>)
add_library(Libmultiprocess::multiprocess ALIAS multiprocess)
target_include_directories(multiprocess PUBLIC
  $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/include>
  $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
  $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
  ${CAPNP_INCLUDE_DIRECTORY})
target_link_libraries(multiprocess PRIVATE CapnProto::capnp)
target_link_libraries(multiprocess PRIVATE CapnProto::capnp-rpc)
target_link_libraries(multiprocess PRIVATE CapnProto::kj)
target_link_libraries(multiprocess PRIVATE CapnProto::kj-async)
set_target_properties(multiprocess PROPERTIES
    PUBLIC_HEADER "${MP_PUBLIC_HEADERS}")
install(TARGETS multiprocess EXPORT LibTargets
  ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR} COMPONENT lib
  PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/mp COMPONENT lib)

# mpgen code generator
add_executable(mpgen src/mp/gen.cpp $<TARGET_OBJECTS:util>)
add_executable(Libmultiprocess::mpgen ALIAS mpgen)
target_include_directories(mpgen PRIVATE $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/include>)
target_include_directories(mpgen PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include> $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)
target_link_libraries(mpgen PRIVATE CapnProto::capnp)
target_link_libraries(mpgen PRIVATE CapnProto::capnp-rpc)
target_link_libraries(mpgen PRIVATE CapnProto::capnpc)
target_link_libraries(mpgen PRIVATE CapnProto::kj)
target_link_libraries(mpgen PRIVATE Threads::Threads)
set_target_properties(mpgen PROPERTIES
    INSTALL_RPATH_USE_LINK_PATH TRUE)
set_target_properties(mpgen PROPERTIES
    PUBLIC_HEADER include/mp/proxy.capnp)
install(TARGETS mpgen EXPORT BinTargets
  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT bin
  PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/mp COMPONENT bin)

# makefile include to invoke mpgen code generator, for downstream Make projects
install(FILES "include/mpgen.mk"
  DESTINATION ${CMAKE_INSTALL_INCLUDEDIR} COMPONENT bin)

# pkg-config module to build against libmultiprocess library, for downstream autoconf projects
configure_file(pkgconfig/libmultiprocess.pc.in "${CMAKE_CURRENT_BINARY_DIR}/pkgconfig/libmultiprocess.pc" @ONLY)
install(FILES "${CMAKE_CURRENT_BINARY_DIR}/pkgconfig/libmultiprocess.pc"
  DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig COMPONENT lib)

# cmake include to invoke mpgen code generator, for downstream CMake projects
install(
  FILES
    ${CMAKE_CURRENT_SOURCE_DIR}/cmake/TargetCapnpSources.cmake
  DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/Libmultiprocess COMPONENT bin)

# CMake target import files, for downstream CMake projects
install(EXPORT BinTargets
  NAMESPACE Libmultiprocess::
  DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/Libmultiprocess COMPONENT bin)
install(EXPORT LibTargets
  NAMESPACE Libmultiprocess::
  DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/Libmultiprocess COMPONENT lib)

# CMake find_package config file, for downstream CMake projects
include(CMakePackageConfigHelpers)
configure_package_config_file(
  ${PROJECT_SOURCE_DIR}/cmake/Config.cmake.in
  LibmultiprocessConfig.cmake
  INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/Libmultiprocess
  NO_SET_AND_CHECK_MACRO)
install(
  FILES
    ${CMAKE_CURRENT_BINARY_DIR}/LibmultiprocessConfig.cmake
  DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/Libmultiprocess
  COMPONENT common)

# Makefile targets to support "make install-bin" "make install-lib"
add_custom_target(install-bin
  COMMAND ${CMAKE_COMMAND} -DCOMPONENT=bin -P ${CMAKE_CURRENT_BINARY_DIR}/cmake_install.cmake
  COMMAND ${CMAKE_COMMAND} -DCOMPONENT=common -P ${CMAKE_CURRENT_BINARY_DIR}/cmake_install.cmake
  VERBATIM)
add_dependencies(install-bin mpgen)
add_custom_target(install-lib
  COMMAND ${CMAKE_COMMAND} -DCOMPONENT=lib -P ${CMAKE_CURRENT_BINARY_DIR}/cmake_install.cmake
  COMMAND ${CMAKE_COMMAND} -DCOMPONENT=common -P ${CMAKE_CURRENT_BINARY_DIR}/cmake_install.cmake
  VERBATIM)
add_dependencies(install-lib multiprocess)

# Example and test subdirectories
add_subdirectory(example EXCLUDE_FROM_ALL)
add_subdirectory(test EXCLUDE_FROM_ALL)