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Switch to more modern CMake

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This commit is contained in:
sangelovic
2020-02-01 23:45:28 +01:00
parent 8dfd29b0f0
commit 3e68fee4cd
4 changed files with 51 additions and 65 deletions
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39
CMakeLists.txt
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@@ -2,7 +2,7 @@
# PROJECT INFORMATION
#-------------------------------
cmake_minimum_required(VERSION 3.6)
cmake_minimum_required(VERSION 3.12)
project(sdbus-c++ VERSION 0.8.0 LANGUAGES C CXX)
@@ -16,12 +16,14 @@ option(BUILD_LIBSYSTEMD "Build libsystemd static library and incorporate it into
if(NOT BUILD_LIBSYSTEMD)
find_package(PkgConfig REQUIRED)
pkg_check_modules(SYSTEMD libsystemd>=236)
if(NOT SYSTEMD_FOUND)
pkg_check_modules(Systemd IMPORTED_TARGET GLOBAL libsystemd>=236)
if(NOT TARGET PkgConfig::Systemd)
message(FATAL_ERROR "libsystemd of version at least 236 is required, but was not found "
"(you may turn BUILD_LIBSYSTEMD on for sdbus-c++ to try downloading "
"and building libsystemd in as part of sdbus-c++ during configuration)")
endif()
add_library(Systemd::Libsystemd ALIAS PkgConfig::Systemd)
set(LIBSYSTEMD_VERSION ${Systemd_VERSION})
else()
# Build static libsystemd library as an external project
include(cmake/LibsystemdExternalProject.cmake)
@@ -80,11 +82,7 @@ set(SDBUSCPP_SRCS ${SDBUSCPP_CPP_SRCS} ${SDBUSCPP_HDR_SRCS} ${SDBUSCPP_PUBLIC_HD
# GENERAL COMPILER CONFIGURATION
#-------------------------------
if(${CMAKE_VERSION} VERSION_LESS "3.8.0")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17")
else()
set(CMAKE_CXX_STANDARD 17) # Supported in CMake>=3.8
endif()
set(CMAKE_CXX_STANDARD 17)
#----------------------------------
# LIBRARY BUILD INFORMATION
@@ -93,22 +91,25 @@ endif()
set(SDBUSCPP_VERSION_MAJOR "${PROJECT_VERSION_MAJOR}")
set(SDBUSCPP_VERSION "${PROJECT_VERSION}")
option(BUILD_SHARED_LIBS "Build shared libraries (.so) instead of static ones (.a)" ON)
# We promote BUILD_SHARED_LIBS flags to (global) option only if we are the main project
if(CMAKE_SOURCE_DIR STREQUAL PROJECT_SOURCE_DIR)
option(BUILD_SHARED_LIBS "Build shared libraries (.so) instead of static ones (.a)" ON)
endif()
# Having an object target allows unit tests to reuse already built sources without re-building
add_library(sdbus-c++-objlib OBJECT ${SDBUSCPP_SRCS})
target_compile_definitions(sdbus-c++-objlib PRIVATE BUILD_LIB=1 LIBSYSTEMD_VERSION=${SYSTEMD_VERSION})
target_compile_definitions(sdbus-c++-objlib PRIVATE BUILD_LIB=1 LIBSYSTEMD_VERSION=${LIBSYSTEMD_VERSION})
target_include_directories(sdbus-c++-objlib PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src>
$<BUILD_INTERFACE:${SYSTEMD_INCLUDE_DIRS}>)
if(BUILD_SHARED_LIBS)
set_target_properties(sdbus-c++-objlib PROPERTIES POSITION_INDEPENDENT_CODE ON)
$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src>)
if(DEFINED BUILD_SHARED_LIBS)
set_target_properties(sdbus-c++-objlib PROPERTIES POSITION_INDEPENDENT_CODE ${BUILD_SHARED_LIBS})
endif()
if(BUILD_LIBSYSTEMD)
add_dependencies(sdbus-c++-objlib LibsystemdBuildProject)
endif()
target_link_libraries(sdbus-c++-objlib PUBLIC Systemd::Libsystemd)
add_library(sdbus-c++ $<TARGET_OBJECTS:sdbus-c++-objlib>)
add_library(sdbus-c++)
target_include_directories(sdbus-c++ PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)
set_target_properties(sdbus-c++
@@ -116,13 +117,17 @@ set_target_properties(sdbus-c++
VERSION "${SDBUSCPP_VERSION}"
SOVERSION "${SDBUSCPP_VERSION_MAJOR}"
OUTPUT_NAME "sdbus-c++")
target_link_libraries(sdbus-c++ PRIVATE ${SYSTEMD_LIBRARIES})
target_link_libraries(sdbus-c++ PRIVATE sdbus-c++-objlib)
#----------------------------------
# INSTALLATION
#----------------------------------
set(EXPORT_SET sdbus-c++)
if(NOT BUILD_SHARED_LIBS)
list(APPEND EXPORT_SET "sdbus-c++-objlib")
endif()
install(TARGETS sdbus-c++
install(TARGETS ${EXPORT_SET}
EXPORT sdbus-c++-targets
RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT libraries
LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR} COMPONENT libraries