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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file LICENSE.rst or https://cmake.org/licensing for details.
#[=======================================================================[.rst:
FindBZip2
---------
Finds the BZip2 data compression library (libbz2):
.. code-block:: cmake
find_package(BZip2 [<version>] [...])
Imported Targets
^^^^^^^^^^^^^^^^
This module provides the following :ref:`Imported Targets`:
``BZip2::BZip2``
.. versionadded:: 3.12
Target encapsulating the usage requirements of BZip2 library. This target is
available only when BZip2 is found.
Result Variables
^^^^^^^^^^^^^^^^
This module defines the following variables:
``BZip2_FOUND``
Boolean indicating whether the BZip2 library is found. For backward
compatibility, the ``BZIP2_FOUND`` variable is also set to the same value.
``BZIP2_INCLUDE_DIRS``
.. versionadded:: 3.12
Include directories needed to use BZip2 library.
``BZIP2_LIBRARIES``
Libraries needed for linking to use BZip2.
``BZIP2_VERSION``
.. versionadded:: 3.26
The version of BZip2 found.
Cache Variables
^^^^^^^^^^^^^^^
The following cache variables may also be set:
``BZIP2_INCLUDE_DIR``
The directory containing the BZip2 headers.
``BZIP2_LIBRARY_RELEASE``
The path to the BZip2 library for release configurations.
``BZIP2_LIBRARY_DEBUG``
The path to the BZip2 library for debug configurations.
``BZIP2_NEED_PREFIX``
Boolean indicating whether BZip2 functions are prefixed with ``BZ2_``
(e.g., ``BZ2_bzCompressInit()``). Versions of BZip2 prior to 1.0.0 used
unprefixed function names (e.g., ``bzCompressInit()``).
Legacy Variables
^^^^^^^^^^^^^^^^
The following variables are provided for backward compatibility:
``BZIP2_VERSION_STRING``
.. versionchanged:: 3.26
Superseded by ``BZIP2_VERSION``.
The version of BZip2 found.
Examples
^^^^^^^^
Finding BZip2 library and linking it to a project target:
.. code-block:: cmake
find_package(BZip2)
target_link_libraries(project_target PRIVATE BZip2::BZip2)
#]=======================================================================]
cmake_policy(PUSH)
cmake_policy(SET CMP0159 NEW) # file(STRINGS) with REGEX updates CMAKE_MATCH_<n>
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 libbz2 libbzip2 NAMES_PER_DIR ${_BZIP2_PATHS} PATH_SUFFIXES lib)
find_library(BZIP2_LIBRARY_DEBUG NAMES bz2d bzip2d libbz2d libbzip2d NAMES_PER_DIR ${_BZIP2_PATHS} PATH_SUFFIXES lib)
include(${CMAKE_CURRENT_LIST_DIR}/SelectLibraryConfigurations.cmake)
select_library_configurations(BZIP2)
else ()
file(TO_CMAKE_PATH "${BZIP2_LIBRARIES}" BZIP2_LIBRARIES)
endif ()
if (BZIP2_INCLUDE_DIR AND EXISTS "${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}")
set(BZIP2_VERSION ${BZIP2_VERSION_STRING})
endif ()
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(BZip2
REQUIRED_VARS BZIP2_LIBRARIES BZIP2_INCLUDE_DIR
VERSION_VAR BZIP2_VERSION)
if (BZip2_FOUND)
set(BZIP2_INCLUDE_DIRS ${BZIP2_INCLUDE_DIR})
include(${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 ${BZIP2_LIBRARIES})
# Versions before 1.0.2 required <stdio.h> for the FILE definition.
set(BZip2_headers "bzlib.h")
if(BZIP2_VERSION VERSION_LESS "1.0.2")
list(PREPEND BZip2_headers "stdio.h")
endif()
check_symbol_exists(BZ2_bzCompressInit "${BZip2_headers}" BZIP2_NEED_PREFIX)
unset(BZip2_headers)
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)
cmake_policy(POP)
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