windows fixes

# @project      The CERN Tape Archive (CTA)

# @copyright    Copyright © 2015-2022 CERN

# @license      This program is free software, distributed under the terms of the GNU General Public

#               Licence version 3 (GPL Version 3), copied verbatim in the file "COPYING". You can

#               redistribute it and/or modify it under the terms of the GPL Version 3, or (at your

#               option) any later version.

#

#               This program is distributed in the hope that it will be useful, but WITHOUT ANY

#               WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A

#               PARTICULAR PURPOSE. See the GNU General Public License for more details.

#

#               In applying this licence, CERN does not waive the privileges and immunities

#               granted to it by virtue of its status as an Intergovernmental Organization or

#               submit itself to any jurisdiction.

# This module will set the following variables:

#     JSON-C_FOUND

#     JSON-C_INCLUDE_DIRS

#     JSON-C_LIBRARIES

find_path(JSON-C_INCLUDE_DIRS

  json.h

  PATHS /usr/include/json-c

  NO_DEFAULT_PATH)

find_library(JSON-C_LIBRARIES

  NAME json-c

  PATHS /usr/lib64

  NO_DEFAULT_PATH)

# =====================================================================

# Findjson-c.cmake (Shared Library Version - Refined for Windows DLL Paths)

# =====================================================================

include(FindPackageHandleStandardArgs)

find_package_handle_standard_args(json-c DEFAULT_MSG

  JSON-C_INCLUDE_DIRS JSON-C_LIBRARIES)

# -----------------------------------------------------------------------------

# 1. Find Header and Link Libraries

# -----------------------------------------------------------------------------

# Find the header file (e.g., json-c/json.h or json.h)

find_path(JSONC_INCLUDE_DIR NAMES json-c/json.h json.h

    HINTS ENV JSONC_ROOT

    PATH_SUFFIXES include

)

# Find the shared library file (.lib on Windows, .so/.dylib elsewhere)

# json-c library names can vary (e.g., json-c, json-c-0, json-c.so.0)

find_library(JSONC_LIBRARY NAMES json-c json-c-0)

# -----------------------------------------------------------------------------

# 2. Handle Required Arguments

# -----------------------------------------------------------------------------

find_package_handle_standard_args(JsonC

    FOUND_VAR           JSONC_FOUND

    REQUIRED_VARS       JSONC_INCLUDE_DIR

                        JSONC_LIBRARY

    FAIL_MESSAGE        "Could NOT find json-c shared library or headers."

)

# -----------------------------------------------------------------------------

# 3. Define Imported Shared Target

# -----------------------------------------------------------------------------

if(JSONC_FOUND)

    # 1. Define the target as SHARED IMPORTED

    # We use a single target since json-c is generally one library.

    add_library(JsonC::JsonC SHARED IMPORTED)

    # 2. Set the public interface (headers)

    set_target_properties(JsonC::JsonC PROPERTIES

        INTERFACE_INCLUDE_DIRECTORIES "${JSONC_INCLUDE_DIR}"

    )

    # 3. Set the location properties

    if(WIN32)

        # Set IMPORTED_IMPLIB (the .lib) for linking

        set_target_properties(JsonC::JsonC PROPERTIES

            IMPORTED_IMPLIB "${JSONC_LIBRARY}"

        )

        # CRITICAL FOR DLL PATH RESOLUTION: Determine the DLL path.

        # We assume a common structure: DLLs are in 'bin' and .lib are in 'lib'.

        get_filename_component(_LIB_DIR "${JSONC_LIBRARY}" DIRECTORY)

        get_filename_component(_PARENT_DIR "${_LIB_DIR}" DIRECTORY)

        # Determine the DLL name (strip prefix/suffix, often just 'json-c')

        get_filename_component(_LIB_NAME_WE "${JSONC_LIBRARY}" NAME_WE)

        string(REGEX REPLACE "^lib" "" _DLL_NAME_BASE "${_LIB_NAME_WE}")

        # 💡 Heuristic: Assuming DLL is in <parent>/bin/

        # Set IMPORTED_LOCATION for both Debug and Release configurations

        set_target_properties(JsonC::JsonC PROPERTIES

            # Assuming VCPKG/standard installs put the DLL in bin/

            IMPORTED_LOCATION_RELEASE "${_PARENT_DIR}/bin/${_DLL_NAME_BASE}.dll"

            # Assuming a common debug suffix 'd' (e.g., json-cd.dll)

            IMPORTED_LOCATION_DEBUG   "${_PARENT_DIR}/bin/${_DLL_NAME_BASE}d.dll"

            # Add RelWithDebInfo as well, which might have the same DLL name as Release

            IMPORTED_LOCATION_RELWITHDEBINFO "${_PARENT_DIR}/bin/${_DLL_NAME_BASE}.dll"

        )

    else()

        # Non-Windows systems: link file is the runtime file

        set_target_properties(JsonC::JsonC PROPERTIES

            IMPORTED_LOCATION "${JSONC_LIBRARY}"

        )

    endif()

endif()

# Hide internal variables from the CMake GUI

mark_as_advanced(

    JSONC_INCLUDE_DIR

    JSONC_LIBRARY

)

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