CMakeLists.txt

# Note: we need >= v3.23 in order to make use of file sets for header installation
cmake_minimum_required(VERSION 3.23...3.31 FATAL_ERROR)

set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/find_modules")

include(soci_parse_version)
soci_parse_version(
  ROOT_DIR "${CMAKE_CURRENT_SOURCE_DIR}"
  OUTPUT_VARIABLE SOCI_VERSION
)

project(SOCI
  VERSION ${SOCI_VERSION}
  DESCRIPTION "C++ database access library"
  HOMEPAGE_URL "https://soci.sourceforge.net/"
  LANGUAGES C CXX
)

include(soci_utils)

if (NOT DEFINED CMAKE_CXX_STANDARD OR CMAKE_CXX_STANDARD LESS 14)
  set(CMAKE_CXX_STANDARD 14)
endif()
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)
set(CMAKE_POSITION_INDEPENDENT_CODE ON)
set(CMAKE_CXX_VISIBILITY_PRESET hidden)

include(CMakeDependentOption)
include(CheckIPOSupported)

check_ipo_supported(RESULT LTO_AVAILABLE)

if (SOCI_STATIC)
  set(SHARED_DEFAULT OFF)
elseif(DEFINED BUILD_SHARED_LIBS)
  set(SHARED_DEFAULT ${BUILD_SHARED_LIBS})
else()
  set(SHARED_DEFAULT ON)
endif()

option(SOCI_SHARED "Enable building SOCI as a shared library" ${SHARED_DEFAULT})
option(SOCI_TESTS "Enable building SOCI test cases" ${PROJECT_IS_TOP_LEVEL})
option(WITH_BOOST "Enable Boost support" ON)
cmake_dependent_option(SOCI_LTO "Enable link time optimizations in release builds" ON "LTO_AVAILABLE" OFF)


# Configure LTO for anything but Debug builds (if enabled in the first place)
set(CMAKE_INTERPROCEDURAL_OPTIMIZATION ${SOCI_LTO})
set(CMAKE_INTERPROCEDURAL_OPTIMIZATION_DEBUG OFF)

if (NOT APPLE)
  # This makes runtime loaders look for library dependencies
  # in the same directory as the library is located in.
  # For details see Craig Scott's CppCon 2019 talk

  # Note: The variable's content is set to $ORIGIN literally,
  # this is NOT a butchered cmake variable expansion
  set(CMAKE_INSTALL_RPATH "$ORIGIN")
endif()

if (NOT DEFINED CMAKE_RUNTIME_OUTPUT_DIRECTORY)
  # Ensure that build artifacts are easy to find. And on Windows this
  # guarantees that the built DLLs end up next to applications
  # linking to them as otherwise they won't be found.
  set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
  set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
  set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)

  if (NOT PROJECT_IS_TOP_LEVEL)
    # If the embedding project does not define these variables, this can lead to
    # inconsistencies which can cause issues on Windows when e.g. the embedding
    # project has an executable that links to a SOCI DLL which will be put into
    # a different directory which will lead to the exe not finding the DLL.
    message(WARNING "Setting CMAKE_{LIBRARY, ARCHIVE, RUNTIME}_DIRECTORY variables which should have done by the embedding cmake project")
  endif()
endif()

if (SOCI_SHARED)
  set(SOCI_LIB_TYPE "SHARED")
else()
  set(SOCI_LIB_TYPE "STATIC")
endif()


include(soci_compiler_options)
include(soci_install_dirs)

add_subdirectory(src)

include(soci_compat)


if (SOCI_TESTS)
  include(CTest)
  enable_testing()
  add_subdirectory(tests)
endif()


# Packaging
include(CMakePackageConfigHelpers)
configure_package_config_file("soci-config.cmake.in" "${CMAKE_CURRENT_BINARY_DIR}/soci-config.cmake"
  INSTALL_DESTINATION "${SOCI_INSTALL_CMAKEDIR}"
)
write_basic_package_version_file(soci-config-version.cmake
  VERSION ${PROJECT_VERSION}
  COMPATIBILITY SameMajorVersion
)
install(
  FILES
    "${CMAKE_CURRENT_BINARY_DIR}/soci-config.cmake"
    "${CMAKE_CURRENT_BINARY_DIR}/soci-config-version.cmake"
    DESTINATION "${SOCI_INSTALL_CMAKEDIR}"
)