FindJsonCpp.cmake

# stolen fron https://github.com/rpavlik/cmake-modules/blob/master/FindJsonCpp.cmake

# - Find jsoncpp - Overarching find module
# This is a over-arching find module to find older jsoncpp versions and those sadly built
# without JSONCPP_WITH_CMAKE_PACKAGE=ON, as well as those built with the cmake config file.
# It also wraps the different versions of the module.
#
# On CMake 3.0 and newer:
#  JsonCpp::JsonCpp - Imported target (possibly an interface/alias) to use:
#  if anything is populated, this is. If both shared and static are found, then
#  this will be the static version on DLL platforms and shared on non-DLL platforms.
#  JsonCpp::JsonCppShared - Imported target (possibly an interface/alias) for a
#  shared library version.
#  JsonCpp::JsonCppStatic - Imported target (possibly an interface/alias) for a
#  static library version.
#
# On all CMake versions: (Note that on CMake 2.8.10 and earlier, you may need to use JSONCPP_INCLUDE_DIRS)
#  JSONCPP_LIBRARY - wraps JsonCpp::JsonCpp or equiv.
#  JSONCPP_LIBRARY_IS_SHARED - if we know for sure JSONCPP_LIBRARY is shared, this is true-ish. We try to "un-set" it if we don't know one way or another.
#  JSONCPP_LIBRARY_SHARED - wraps JsonCpp::JsonCppShared or equiv.
#  JSONCPP_LIBRARY_STATIC - wraps JsonCpp::JsonCppStatic or equiv.
#  JSONCPP_INCLUDE_DIRS - Include directories - should (generally?) not needed if you require CMake 2.8.11+ since it handles target include directories.
#
#  JSONCPP_FOUND - True if JsonCpp was found.
#
# Original Author:
# 2016 Ryan Pavlik <ryan.pavlik@gmail.com>
# Incorporates work from the module contributed to VRPN under the same license:
# 2011 Philippe Crassous (ENSAM ParisTech / Institut Image) p.crassous _at_ free.fr
#
# Copyright Philippe Crassous 2011.
# Copyright Sensics, Inc. 2016.
# Distributed under the Boost Software License, Version 1.0.
# (See accompanying file LICENSE_1_0.txt or copy at
# http://www.boost.org/LICENSE_1_0.txt)

set(__jsoncpp_have_namespaced_targets OFF)
set(__jsoncpp_have_interface_support OFF)
if(NOT ("${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION}" LESS 3.0))
    set(__jsoncpp_have_namespaced_targets ON)
    set(__jsoncpp_have_interface_support ON)
elseif(("${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION}" EQUAL 2.8) AND "${CMAKE_PATCH_VERSION}" GREATER 10)
    set(__jsoncpp_have_interface_support ON)
endif()

# sets __jsoncpp_have_jsoncpplib based on whether or not we have a real imported jsoncpp_lib target.
macro(_jsoncpp_check_for_real_jsoncpplib)
    set(__jsoncpp_have_jsoncpplib FALSE)
    if(TARGET jsoncpp_lib)
        get_property(
            __jsoncpp_lib_type
            TARGET jsoncpp_lib
            PROPERTY TYPE)
        # We make interface libraries. If an actual config module made it, it would be an imported library.
        if(NOT __jsoncpp_lib_type STREQUAL "INTERFACE_LIBRARY")
            set(__jsoncpp_have_jsoncpplib TRUE)
        endif()
    endif()
    #message(STATUS "__jsoncpp_have_jsoncpplib ${__jsoncpp_have_jsoncpplib}")
endmacro()

include(FindPackageHandleStandardArgs)
# Ensure that if this is TRUE later, it's because we set it.
set(JSONCPP_FOUND FALSE)
set(__jsoncpp_have_jsoncpplib FALSE)

# See if we find a CMake config file - there is no harm in calling this more than once,
# and we need to call it at least once every CMake invocation to create the original
# imported targets, since those don't stick around like cache variables.
find_package(jsoncpp QUIET NO_MODULE)

if(jsoncpp_FOUND)
    # Build a string to help us figure out when to invalidate our cache variables.
    # start with where we found jsoncpp
    set(__jsoncpp_info_string "[${jsoncpp_DIR}]")

    # part of the string to indicate if we found a real jsoncpp_lib (and what kind)
    _jsoncpp_check_for_real_jsoncpplib()

    macro(_jsoncpp_apply_map_config target)
        if(MSVC)
            # Can't do this - different runtimes, incompatible ABI, etc.
            set(_jsoncpp_debug_fallback)
        else()
            set(_jsoncpp_debug_fallback DEBUG)
            #osvr_stash_map_config(DEBUG DEBUG RELWITHDEBINFO RELEASE MINSIZEREL NONE)
        endif()
        # Appending, just in case using project or upstream fixes this.
        set_property(
            TARGET ${target}
            APPEND
            PROPERTY MAP_IMPORTED_CONFIG_RELEASE RELEASE RELWITHDEBINFO MINSIZEREL NONE ${_jsoncpp_debug_fallback})
        set_property(
            TARGET ${target}
            APPEND
            PROPERTY MAP_IMPORTED_CONFIG_RELWITHDEBINFO RELWITHDEBINFO RELEASE MINSIZEREL NONE
                     ${_jsoncpp_debug_fallback})
        set_property(
            TARGET ${target}
            APPEND
            PROPERTY MAP_IMPORTED_CONFIG_MINSIZEREL MINSIZEREL RELEASE RELWITHDEBINFO NONE ${_jsoncpp_debug_fallback})
        set_property(
            TARGET ${target}
            APPEND
            PROPERTY MAP_IMPORTED_CONFIG_NONE NONE RELEASE RELWITHDEBINFO MINSIZEREL ${_jsoncpp_debug_fallback})
        if(NOT MSVC)
            set_property(
                TARGET ${target}
                APPEND
                PROPERTY MAP_IMPORTED_CONFIG_DEBUG DEBUG RELWITHDEBINFO RELEASE MINSIZEREL NONE)
        endif()
    endmacro()
    if(__jsoncpp_have_jsoncpplib)
        list(APPEND __jsoncpp_info_string "[${__jsoncpp_lib_type}]")
        _jsoncpp_apply_map_config(jsoncpp_lib)
    else()
        list(APPEND __jsoncpp_info_string "[]")
    endif()
    # part of the string to indicate if we found jsoncpp_lib_static
    if(TARGET jsoncpp_lib_static)
        list(APPEND __jsoncpp_info_string "[T]")
        _jsoncpp_apply_map_config(jsoncpp_lib_static)
    else()
        list(APPEND __jsoncpp_info_string "[]")
    endif()
endif()

# If we found something, and it's not the exact same as what we've found before...
# NOTE: The contents of this "if" block update only (internal) cache variables!
# (since this will only get run the first CMake pass that finds jsoncpp or that finds a different/updated install)
if(jsoncpp_FOUND AND NOT __jsoncpp_info_string STREQUAL "${JSONCPP_CACHED_JSONCPP_DIR_DETAILS}")
    #message("Updating jsoncpp cache variables! ${__jsoncpp_info_string}")
    set(JSONCPP_CACHED_JSONCPP_DIR_DETAILS
        "${__jsoncpp_info_string}"
        CACHE INTERNAL "" FORCE)
    unset(JSONCPP_IMPORTED_LIBRARY_SHARED)
    unset(JSONCPP_IMPORTED_LIBRARY_STATIC)
    unset(JSONCPP_IMPORTED_LIBRARY)
    unset(JSONCPP_IMPORTED_INCLUDE_DIRS)
    unset(JSONCPP_IMPORTED_LIBRARY_IS_SHARED)

    # if(__jsoncpp_have_jsoncpplib) is equivalent to if(TARGET jsoncpp_lib) except it excludes our
    # "invented" jsoncpp_lib interface targets, made for convenience purposes after this block.

    if(__jsoncpp_have_jsoncpplib AND TARGET jsoncpp_lib_static)

        # A veritable cache of riches - we have both shared and static!
        set(JSONCPP_IMPORTED_LIBRARY_SHARED
            jsoncpp_lib
            CACHE INTERNAL "" FORCE)
        set(JSONCPP_IMPORTED_LIBRARY_STATIC
            jsoncpp_lib_static
            CACHE INTERNAL "" FORCE)
        if(WIN32
           OR CYGWIN
           OR MINGW)
            # DLL platforms: static library should be default
            set(JSONCPP_IMPORTED_LIBRARY
                ${JSONCPP_IMPORTED_LIBRARY_STATIC}
                CACHE INTERNAL "" FORCE)
            set(JSONCPP_IMPORTED_LIBRARY_IS_SHARED
                FALSE
                CACHE INTERNAL "" FORCE)
        else()
            # Other platforms - might require PIC to be linked into shared libraries, so safest to prefer shared.
            set(JSONCPP_IMPORTED_LIBRARY
                ${JSONCPP_IMPORTED_LIBRARY_SHARED}
                CACHE INTERNAL "" FORCE)
            set(JSONCPP_IMPORTED_LIBRARY_IS_SHARED
                TRUE
                CACHE INTERNAL "" FORCE)
        endif()

    elseif(TARGET jsoncpp_lib_static)
        # Well, only one variant, but we know for sure that it's static.
        set(JSONCPP_IMPORTED_LIBRARY_STATIC
            jsoncpp_lib_static
            CACHE INTERNAL "" FORCE)
        set(JSONCPP_IMPORTED_LIBRARY
            jsoncpp_lib_static
            CACHE INTERNAL "" FORCE)
        set(JSONCPP_IMPORTED_LIBRARY_IS_SHARED
            FALSE
            CACHE INTERNAL "" FORCE)

    elseif(__jsoncpp_have_jsoncpplib AND __jsoncpp_lib_type STREQUAL "STATIC_LIBRARY")
        # We were able to figure out the mystery library is static!
        set(JSONCPP_IMPORTED_LIBRARY_STATIC
            jsoncpp_lib
            CACHE INTERNAL "" FORCE)
        set(JSONCPP_IMPORTED_LIBRARY
            jsoncpp_lib
            CACHE INTERNAL "" FORCE)
        set(JSONCPP_IMPORTED_LIBRARY_IS_SHARED
            FALSE
            CACHE INTERNAL "" FORCE)

    elseif(__jsoncpp_have_jsoncpplib AND __jsoncpp_lib_type STREQUAL "SHARED_LIBRARY")
        # We were able to figure out the mystery library is shared!
        set(JSONCPP_IMPORTED_LIBRARY_SHARED
            jsoncpp_lib
            CACHE INTERNAL "" FORCE)
        set(JSONCPP_IMPORTED_LIBRARY
            jsoncpp_lib
            CACHE INTERNAL "" FORCE)
        set(JSONCPP_IMPORTED_LIBRARY_IS_SHARED
            TRUE
            CACHE INTERNAL "" FORCE)

    elseif(__jsoncpp_have_jsoncpplib)
        # One variant, and we have no idea if this is just an old version or if
        # this is shared based on the target name alone. Hmm.
        set(JSONCPP_IMPORTED_LIBRARY
            jsoncpp_lib
            CACHE INTERNAL "" FORCE)
    endif()

    # Now, we need include directories. Can't just limit this to old CMakes, since
    # new CMakes might be used to build projects designed to support older ones.
    if(__jsoncpp_have_jsoncpplib)
        get_property(
            __jsoncpp_interface_include_dirs
            TARGET jsoncpp_lib
            PROPERTY INTERFACE_INCLUDE_DIRECTORIES)
        if(__jsoncpp_interface_include_dirs)
            set(JSONCPP_IMPORTED_INCLUDE_DIRS
                "${__jsoncpp_interface_include_dirs}"
                CACHE INTERNAL "" FORCE)
        endif()
    endif()
    if(TARGET jsoncpp_lib_static AND NOT JSONCPP_IMPORTED_INCLUDE_DIRS)
        get_property(
            __jsoncpp_interface_include_dirs
            TARGET jsoncpp_lib_static
            PROPERTY INTERFACE_INCLUDE_DIRECTORIES)
        if(__jsoncpp_interface_include_dirs)
            set(JSONCPP_IMPORTED_INCLUDE_DIRS
                "${__jsoncpp_interface_include_dirs}"
                CACHE INTERNAL "" FORCE)
        endif()
    endif()
endif()

# As a convenience...
if(TARGET jsoncpp_lib_static AND NOT TARGET jsoncpp_lib)
    add_library(jsoncpp_lib INTERFACE)
    target_link_libraries(jsoncpp_lib INTERFACE jsoncpp_lib_static)
endif()

if(JSONCPP_IMPORTED_LIBRARY)
    if(NOT JSONCPP_IMPORTED_INCLUDE_DIRS)
        # OK, so we couldn't get it from the target... maybe we can figure it out from jsoncpp_DIR.

        # take off the jsoncpp component
        get_filename_component(__jsoncpp_import_root "${jsoncpp_DIR}/.." ABSOLUTE)
        set(__jsoncpp_hints "${__jsoncpp_import_root}")
        # take off the cmake component
        get_filename_component(__jsoncpp_import_root "${__jsoncpp_import_root}/.." ABSOLUTE)
        list(APPEND __jsoncpp_hints "${__jsoncpp_import_root}")
        # take off the lib component
        get_filename_component(__jsoncpp_import_root "${__jsoncpp_import_root}/.." ABSOLUTE)
        list(APPEND __jsoncpp_hints "${__jsoncpp_import_root}")
        # take off one more component in case of multiarch lib
        get_filename_component(__jsoncpp_import_root "${__jsoncpp_import_root}/.." ABSOLUTE)
        list(APPEND __jsoncpp_hints "${__jsoncpp_import_root}")

        # Now, search.
        find_path(
            JsonCpp_INCLUDE_DIR
            NAMES json/json.h
            PATH_SUFFIXES include jsoncpp include/jsoncpp
            HINTS ${__jsoncpp_hints})
        if(JsonCpp_INCLUDE_DIR)
            mark_as_advanced(JsonCpp_INCLUDE_DIR)
            # Note - this does not set it in the cache, in case we find it better at some point in the future!
            set(JSONCPP_IMPORTED_INCLUDE_DIRS ${JsonCpp_INCLUDE_DIR})
        endif()
    endif()

    find_package_handle_standard_args(JsonCpp DEFAULT_MSG jsoncpp_DIR JSONCPP_IMPORTED_LIBRARY
                                      JSONCPP_IMPORTED_INCLUDE_DIRS)
endif()

if(JSONCPP_FOUND)
    # Create any missing namespaced targets from the config module.
    if(__jsoncpp_have_namespaced_targets)
        if(JSONCPP_IMPORTED_LIBRARY AND NOT TARGET JsonCpp::JsonCpp)
            add_library(JsonCpp::JsonCpp INTERFACE IMPORTED)
            set_target_properties(
                JsonCpp::JsonCpp PROPERTIES INTERFACE_INCLUDE_DIRECTORIES "${JSONCPP_IMPORTED_INCLUDE_DIRS}"
                                            INTERFACE_LINK_LIBRARIES "${JSONCPP_IMPORTED_LIBRARY}")
        endif()

        if(JSONCPP_IMPORTED_LIBRARY_SHARED AND NOT TARGET JsonCpp::JsonCppShared)
            add_library(JsonCpp::JsonCppShared INTERFACE IMPORTED)
            set_target_properties(
                JsonCpp::JsonCppShared PROPERTIES INTERFACE_INCLUDE_DIRECTORIES "${JSONCPP_IMPORTED_INCLUDE_DIRS}"
                                                  INTERFACE_LINK_LIBRARIES "${JSONCPP_IMPORTED_LIBRARY_SHARED}")
        endif()

        if(JSONCPP_IMPORTED_LIBRARY_STATIC AND NOT TARGET JsonCpp::JsonCppStatic)
            add_library(JsonCpp::JsonCppStatic INTERFACE IMPORTED)
            set_target_properties(
                JsonCpp::JsonCppStatic PROPERTIES INTERFACE_INCLUDE_DIRECTORIES "${JSONCPP_IMPORTED_INCLUDE_DIRS}"
                                                  INTERFACE_LINK_LIBRARIES "${JSONCPP_IMPORTED_LIBRARY_STATIC}")
        endif()

        # Hide the stuff we didn't, and no longer, need.
        if(NOT JsonCpp_LIBRARY)
            unset(JsonCpp_LIBRARY CACHE)
        endif()
        if(NOT JsonCpp_INCLUDE_DIR)
            unset(JsonCpp_INCLUDE_DIR CACHE)
        endif()
    endif()

    set(JSONCPP_LIBRARY ${JSONCPP_IMPORTED_LIBRARY})
    set(JSONCPP_INCLUDE_DIRS ${JSONCPP_IMPORTED_INCLUDE_DIRS})
    if(DEFINED JSONCPP_IMPORTED_LIBRARY_IS_SHARED)
        set(JSONCPP_LIBRARY_IS_SHARED ${JSONCPP_IMPORTED_LIBRARY_IS_SHARED})
    else()
        unset(JSONCPP_LIBRARY_IS_SHARED)
    endif()

    if(JSONCPP_IMPORTED_LIBRARY_SHARED)
        set(JSONCPP_LIBRARY_SHARED ${JSONCPP_IMPORTED_LIBRARY_SHARED})
    endif()

    if(JSONCPP_IMPORTED_LIBRARY_STATIC)
        set(JSONCPP_LIBRARY_STATIC ${JSONCPP_IMPORTED_LIBRARY_STATIC})
    endif()
endif()

# Still nothing after looking for the config file: must go "old-school"
if(NOT JSONCPP_FOUND)
    # Invoke pkgconfig for hints
    find_package(PkgConfig QUIET)
    set(_JSONCPP_INCLUDE_HINTS)
    set(_JSONCPP_LIB_HINTS)
    if(PKG_CONFIG_FOUND)
        pkg_search_module(_JSONCPP_PC QUIET jsoncpp)
        if(_JSONCPP_PC_INCLUDE_DIRS)
            set(_JSONCPP_INCLUDE_HINTS ${_JSONCPP_PC_INCLUDE_DIRS})
        endif()
        if(_JSONCPP_PC_LIBRARY_DIRS)
            set(_JSONCPP_LIB_HINTS ${_JSONCPP_PC_LIBRARY_DIRS})
        endif()
        if(_JSONCPP_PC_LIBRARIES)
            set(_JSONCPP_LIB_NAMES ${_JSONCPP_PC_LIBRARIES})
        endif()
    endif()

    if(NOT _JSONCPP_LIB_NAMES)
        # OK, if pkg-config wasn't able to give us a library name suggestion, then we may
        # have to resort to some intense old logic.
        set(_JSONCPP_LIB_NAMES jsoncpp)
        set(_JSONCPP_PATHSUFFIXES)

        if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
            list(APPEND _JSONCPP_PATHSUFFIXES linux-gcc) # bit of a generalization but close...
        endif()
        if(CMAKE_COMPILER_IS_GNUCXX AND CMAKE_SYSTEM_NAME STREQUAL "Linux")
            list(APPEND _JSONCPP_LIB_NAMES json_linux-gcc-${CMAKE_CXX_COMPILER_VERSION}_libmt json_linux-gcc_libmt)
            list(APPEND _JSONCPP_PATHSUFFIXES linux-gcc-${CMAKE_CXX_COMPILER_VERSION})

        elseif(MSVC)
            if(MSVC_VERSION EQUAL 1200)
                list(APPEND _JSONCPP_LIB_NAMES json_vc6_libmt)
                list(APPEND _JSONCPP_PATHSUFFIXES msvc6)
            elseif(MSVC_VERSION EQUAL 1300)
                list(APPEND _JSONCPP_LIB_NAMES json_vc7_libmt)
                list(APPEND _JSONCPP_PATHSUFFIXES msvc7)
            elseif(MSVC_VERSION EQUAL 1310)
                list(APPEND _JSONCPP_LIB_NAMES json_vc71_libmt)
                list(APPEND _JSONCPP_PATHSUFFIXES msvc71)
            elseif(MSVC_VERSION EQUAL 1400)
                list(APPEND _JSONCPP_LIB_NAMES json_vc8_libmt)
                list(APPEND _JSONCPP_PATHSUFFIXES msvc80)
            elseif(MSVC_VERSION EQUAL 1500)
                list(APPEND _JSONCPP_LIB_NAMES json_vc9_libmt)
                list(APPEND _JSONCPP_PATHSUFFIXES msvc90)
            elseif(MSVC_VERSION EQUAL 1600)
                list(APPEND _JSONCPP_LIB_NAMES json_vc10_libmt)
                list(APPEND _JSONCPP_PATHSUFFIXES msvc10 msvc100)
            endif()

        elseif(MINGW)
            list(APPEND _JSONCPP_LIB_NAMES json_mingw_libmt)
            list(APPEND _JSONCPP_PATHSUFFIXES mingw)

        else()
            list(APPEND _JSONCPP_LIB_NAMES json_suncc_libmt json_vacpp_libmt)
        endif()
    endif() # end of old logic

    # Actually go looking.
    find_path(
        JsonCpp_INCLUDE_DIR
        NAMES json/json.h
        PATH_SUFFIXES jsoncpp
        HINTS ${_JSONCPP_INCLUDE_HINTS})
    find_library(
        JsonCpp_LIBRARY
        NAMES ${_JSONCPP_LIB_NAMES}
        PATHS libs
        PATH_SUFFIXES ${_JSONCPP_PATHSUFFIXES}
        HINTS ${_JSONCPP_LIB_HINTS})

    find_package_handle_standard_args(JsonCpp DEFAULT_MSG JsonCpp_INCLUDE_DIR JsonCpp_LIBRARY)

    if(JSONCPP_FOUND)
        # We already know that the target doesn't exist, let's make it.
        # TODO don't know why we get errors like:
        # error: 'JsonCpp::JsonCpp-NOTFOUND', needed by 'bin/osvr_json_to_c', missing and no known rule to make it
        # when we do the imported target commented out below. So, instead, we make an interface
        # target with an alias. Hmm.

        #add_library(JsonCpp::JsonCpp UNKNOWN IMPORTED)
        #set_target_properties(JsonCpp::JsonCpp PROPERTIES
        #	IMPORTED_LOCATION "${JsonCpp_LIBRARY}"
        #	INTERFACE_INCLUDE_DIRECTORIES "${JsonCpp_INCLUDE_DIR}"
        #	IMPORTED_LINK_INTERFACE_LANGUAGES "CXX")

        set(JSONCPP_LIBRARY "${JsonCpp_LIBRARY}")
        set(JSONCPP_INCLUDE_DIRS "${JsonCpp_INCLUDE_DIR}")
        unset(JSONCPP_LIBRARY_IS_SHARED)

        if(__jsoncpp_have_interface_support AND NOT TARGET jsoncpp_interface)
            add_library(jsoncpp_interface INTERFACE)
            set_target_properties(jsoncpp_interface PROPERTIES INTERFACE_LINK_LIBRARIES "${JsonCpp_LIBRARY}"
                                                               INTERFACE_INCLUDE_DIRECTORIES "${JsonCpp_INCLUDE_DIR}")
        endif()
        if(__jsoncpp_have_namespaced_targets)
            if(NOT TARGET JsonCpp::JsonCpp)
                add_library(JsonCpp::JsonCpp ALIAS jsoncpp_interface)
            endif()
        endif()
    endif()
endif()

if(JSONCPP_FOUND)
    mark_as_advanced(jsoncpp_DIR JsonCpp_INCLUDE_DIR JsonCpp_LIBRARY)
endif()