FindBZip2.cmake

# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.

#.rst:
# FindBZip2
# ---------
#
# Try to find BZip2
#
# IMPORTED Targets
# ^^^^^^^^^^^^^^^^
#
# This module defines :prop_tgt:`IMPORTED` target ``BZip2::BZip2``, if
# BZip2 has been found.
#
# Result Variables
# ^^^^^^^^^^^^^^^^
#
# This module defines the following variables:
#
# ::
#
#   BZIP2_FOUND - system has BZip2
#   BZIP2_INCLUDE_DIR - the BZip2 include directory
#   BZIP2_LIBRARIES - Link these to use BZip2
#   BZIP2_NEED_PREFIX - this is set if the functions are prefixed with BZ2_
#   BZIP2_VERSION_STRING - the version of BZip2 found (since CMake 2.8.8)

set(_BZIP2_PATHS PATHS
  "[HKEY_LOCAL_MACHINE\\SOFTWARE\\GnuWin32\\Bzip2;InstallPath]"
  )

find_path(BZIP2_INCLUDE_DIR bzlib.h ${_BZIP2_PATHS} PATH_SUFFIXES include)

if (NOT BZIP2_LIBRARIES)
    find_library(BZIP2_LIBRARY_RELEASE NAMES bz2 bzip2 ${_BZIP2_PATHS} PATH_SUFFIXES lib)
    find_library(BZIP2_LIBRARY_DEBUG NAMES bz2d bzip2d ${_BZIP2_PATHS} PATH_SUFFIXES lib)

    include(${CMAKE_CURRENT_LIST_DIR}/SelectLibraryConfigurations.cmake)
    SELECT_LIBRARY_CONFIGURATIONS(BZIP2)
endif ()

if (BZIP2_INCLUDE_DIR AND EXISTS "${BZIP2_INCLUDE_DIR}/bzlib.h")
    file(STRINGS "${BZIP2_INCLUDE_DIR}/bzlib.h" BZLIB_H REGEX "bzip2/libbzip2 version [0-9]+\\.[^ ]+ of [0-9]+ ")
    string(REGEX REPLACE ".* bzip2/libbzip2 version ([0-9]+\\.[^ ]+) of [0-9]+ .*" "\\1" BZIP2_VERSION_STRING "${BZLIB_H}")
endif ()

include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(BZip2
                                  REQUIRED_VARS BZIP2_LIBRARIES BZIP2_INCLUDE_DIR
                                  VERSION_VAR BZIP2_VERSION_STRING)

if (BZIP2_FOUND)
   include(${CMAKE_CURRENT_LIST_DIR}/CheckSymbolExists.cmake)
   include(${CMAKE_CURRENT_LIST_DIR}/CMakePushCheckState.cmake)
   cmake_push_check_state()
   set(CMAKE_REQUIRED_QUIET ${BZip2_FIND_QUIETLY})
   set(CMAKE_REQUIRED_INCLUDES ${BZIP2_INCLUDE_DIR})
   set(CMAKE_REQUIRED_LIBRARIES ${BZIP2_LIBRARIES})
   CHECK_SYMBOL_EXISTS(BZ2_bzCompressInit "bzlib.h" BZIP2_NEED_PREFIX)
   cmake_pop_check_state()

    if(NOT TARGET BZip2::BZip2)
      add_library(BZip2::BZip2 UNKNOWN IMPORTED)
      set_target_properties(BZip2::BZip2 PROPERTIES
        INTERFACE_INCLUDE_DIRECTORIES "${BZIP2_INCLUDE_DIRS}")

      if(BZIP2_LIBRARY_RELEASE)
        set_property(TARGET BZip2::BZip2 APPEND PROPERTY
          IMPORTED_CONFIGURATIONS RELEASE)
        set_target_properties(BZip2::BZip2 PROPERTIES
          IMPORTED_LOCATION_RELEASE "${BZIP2_LIBRARY_RELEASE}")
      endif()

      if(BZIP2_LIBRARY_DEBUG)
        set_property(TARGET BZip2::BZip2 APPEND PROPERTY
          IMPORTED_CONFIGURATIONS DEBUG)
        set_target_properties(BZip2::BZip2 PROPERTIES
          IMPORTED_LOCATION_DEBUG "${BZIP2_LIBRARY_DEBUG}")
      endif()

      if(NOT BZIP2_LIBRARY_RELEASE AND NOT BZIP2_LIBRARY_DEBUG)
        set_property(TARGET BZip2::BZip2 APPEND PROPERTY
          IMPORTED_LOCATION "${BZIP2_LIBRARY}")
      endif()
    endif()
endif ()

mark_as_advanced(BZIP2_INCLUDE_DIR)