Source/cmake/FindJournald.cmake

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#[=======================================================================[.rst:
FindJournald
-----------

Find Journald-compatible headers and libraries.

Imported Targets
^^^^^^^^^^^^^^^^

``Journald::Journald``
  The library where Journald symbols reside, if found.

Result Variables
^^^^^^^^^^^^^^^^

This will define the following variables in your project:

``Journald_FOUND``
  true if (the requested version of) Journald is available.
``Journald_VERSION``
  the version of the library where Journald symbols reside.
``Journald_LIBRARIES``
  the libraries to link against to use Journald.
``Journald_INCLUDE_DIRS``
  where to find the Journald headers.
``Journald_COMPILE_OPTIONS``
  this should be passed to target_compile_options(), if the
  target is not used for linking

#]=======================================================================]
find_package(PkgConfig QUIET)

# libelogind provides compatible pc and header files
pkg_check_modules(PC_SYSTEMD QUIET libsystemd)
set(Journald_COMPILE_OPTIONS ${PC_SYSTEMD_CFLAGS_OTHER})
set(Journald_VERSION ${PC_SYSTEMD_VERSION})

find_path(Journald_INCLUDE_DIR
    NAMES systemd/sd-journal.h
    HINTS ${PC_SYSTEMD_INCLUDEDIR} ${PC_SYSTEMD_INCLUDE_DIRS}
)

find_library(Journald_LIBRARY
    NAMES ${Journald_NAMES} systemd
    HINTS ${PC_SYSTEMD_LIBDIR} ${PC_SYSTEMD_LIBRARY_DIRS}
)

if (NOT Journald_LIBRARY)
    find_library(Journald_LIBRARY
        NAMES ${Journald_NAMES} elogind
        HINTS ${PC_SYSTEMD_LIBDIR} ${PC_SYSTEMD_LIBRARY_DIRS}
    )
endif ()

include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Journald
    FOUND_VAR Journald_FOUND
    REQUIRED_VARS Journald_LIBRARY Journald_INCLUDE_DIR
    VERSION_VAR Journald_VERSION
)

if (Journald_LIBRARY AND NOT TARGET Journald::Journald)
    add_library(Journald::Journald UNKNOWN IMPORTED GLOBAL)
    set_target_properties(Journald::Journald PROPERTIES
        IMPORTED_LOCATION "${Journald_LIBRARY}"
        INTERFACE_COMPILE_OPTIONS "${Journald_COMPILE_OPTIONS}"
        INTERFACE_INCLUDE_DIRECTORIES "${Journald_INCLUDE_DIR}"
    )
endif ()

mark_as_advanced(Journald_INCLUDE_DIR Journald_LIBRARY)

if (Journald_FOUND)
    set(Journald_LIBRARIES ${Journald_LIBRARY})
    set(Journald_INCLUDE_DIRS ${Journald_INCLUDE_DIR})
endif ()