FindZLIB.cmake
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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.
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#[=======================================================================[.rst:
FindZLIB
--------
Find the native ZLIB includes and library.
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Imported Targets
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^^^^^^^^^^^^^^^^
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.. versionadded:: 3.1
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This module defines :prop_tgt:`IMPORTED` target ``ZLIB::ZLIB``, if
ZLIB has been found.
Result Variables
^^^^^^^^^^^^^^^^
This module defines the following variables:
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``ZLIB_INCLUDE_DIRS``
where to find zlib.h, etc.
``ZLIB_LIBRARIES``
List of libraries when using zlib.
``ZLIB_FOUND``
True if zlib found.
``ZLIB_VERSION``
.. versionadded:: 3.26
the version of Zlib found.
See also legacy variable ``ZLIB_VERSION_STRING``.
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.. versionadded:: 3.4
Debug and Release variants are found separately.
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Legacy Variables
^^^^^^^^^^^^^^^^
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The following variables are provided for backward compatibility:
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``ZLIB_VERSION_MAJOR``
The major version of zlib.
.. versionchanged:: 3.26
Superseded by ``ZLIB_VERSION``.
``ZLIB_VERSION_MINOR``
The minor version of zlib.
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.. versionchanged:: 3.26
Superseded by ``ZLIB_VERSION``.
``ZLIB_VERSION_PATCH``
The patch version of zlib.
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.. versionchanged:: 3.26
Superseded by ``ZLIB_VERSION``.
``ZLIB_VERSION_TWEAK``
The tweak version of zlib.
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.. versionchanged:: 3.26
Superseded by ``ZLIB_VERSION``.
``ZLIB_VERSION_STRING``
The version of zlib found (x.y.z)
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.. versionchanged:: 3.26
Superseded by ``ZLIB_VERSION``.
``ZLIB_MAJOR_VERSION``
The major version of zlib. Superseded by ``ZLIB_VERSION_MAJOR``.
``ZLIB_MINOR_VERSION``
The minor version of zlib. Superseded by ``ZLIB_VERSION_MINOR``.
``ZLIB_PATCH_VERSION``
The patch version of zlib. Superseded by ``ZLIB_VERSION_PATCH``.
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Hints
^^^^^
A user may set ``ZLIB_ROOT`` to a zlib installation root to tell this
module where to look.
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.. versionadded:: 3.24
Set ``ZLIB_USE_STATIC_LIBS`` to ``ON`` to look for static libraries.
Default is ``OFF``.
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#]=======================================================================]
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cmake_policy(PUSH)
cmake_policy(SET CMP0159 NEW) # file(STRINGS) with REGEX updates CMAKE_MATCH_<n>
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if(ZLIB_FIND_COMPONENTS AND NOT ZLIB_FIND_QUIETLY)
message(AUTHOR_WARNING
"ZLIB does not provide any COMPONENTS. Calling\n"
" find_package(ZLIB COMPONENTS ...)\n"
"will always fail."
)
endif()
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set(_ZLIB_SEARCHES)
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# Search ZLIB_ROOT first if it is set.
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if(ZLIB_ROOT)
set(_ZLIB_SEARCH_ROOT PATHS ${ZLIB_ROOT} NO_DEFAULT_PATH)
list(APPEND _ZLIB_SEARCHES _ZLIB_SEARCH_ROOT)
endif()
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# Normal search.
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set(_ZLIB_x86 "(x86)")
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set(_ZLIB_SEARCH_NORMAL
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PATHS "[HKEY_LOCAL_MACHINE\\SOFTWARE\\GnuWin32\\Zlib;InstallPath]"
"$ENV{ProgramFiles}/zlib"
"$ENV{ProgramFiles${_ZLIB_x86}}/zlib")
unset(_ZLIB_x86)
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list(APPEND _ZLIB_SEARCHES _ZLIB_SEARCH_NORMAL)
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if(ZLIB_USE_STATIC_LIBS)
set(ZLIB_NAMES zlibstatic zlibstat zlib z)
set(ZLIB_NAMES_DEBUG zlibstaticd zlibstatd zlibd zd)
else()
set(ZLIB_NAMES z zlib zdll zlib1 zlibstatic zlibwapi zlibvc zlibstat)
set(ZLIB_NAMES_DEBUG zd zlibd zdlld zlibd1 zlib1d zlibstaticd zlibwapid zlibvcd zlibstatd)
endif()
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# Try each search configuration.
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foreach(search ${_ZLIB_SEARCHES})
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find_path(ZLIB_INCLUDE_DIR NAMES zlib.h ${${search}} PATH_SUFFIXES include)
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endforeach()
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# Allow ZLIB_LIBRARY to be set manually, as the location of the zlib library
if(NOT ZLIB_LIBRARY)
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if(DEFINED CMAKE_FIND_LIBRARY_PREFIXES)
set(_zlib_ORIG_CMAKE_FIND_LIBRARY_PREFIXES "${CMAKE_FIND_LIBRARY_PREFIXES}")
else()
set(_zlib_ORIG_CMAKE_FIND_LIBRARY_PREFIXES)
endif()
if(DEFINED CMAKE_FIND_LIBRARY_SUFFIXES)
set(_zlib_ORIG_CMAKE_FIND_LIBRARY_SUFFIXES "${CMAKE_FIND_LIBRARY_SUFFIXES}")
else()
set(_zlib_ORIG_CMAKE_FIND_LIBRARY_SUFFIXES)
endif()
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# Prefix/suffix of the win32/Makefile.gcc build
if(WIN32)
list(APPEND CMAKE_FIND_LIBRARY_PREFIXES "" "lib")
list(APPEND CMAKE_FIND_LIBRARY_SUFFIXES ".dll.a")
endif()
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# Support preference of static libs by adjusting CMAKE_FIND_LIBRARY_SUFFIXES
if(ZLIB_USE_STATIC_LIBS)
if(WIN32)
set(CMAKE_FIND_LIBRARY_SUFFIXES .lib .a ${CMAKE_FIND_LIBRARY_SUFFIXES})
else()
set(CMAKE_FIND_LIBRARY_SUFFIXES .a)
endif()
endif()
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foreach(search ${_ZLIB_SEARCHES})
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find_library(ZLIB_LIBRARY_RELEASE NAMES ${ZLIB_NAMES} NAMES_PER_DIR ${${search}} PATH_SUFFIXES lib)
find_library(ZLIB_LIBRARY_DEBUG NAMES ${ZLIB_NAMES_DEBUG} NAMES_PER_DIR ${${search}} PATH_SUFFIXES lib)
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endforeach()
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# Restore the original find library ordering
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if(DEFINED _zlib_ORIG_CMAKE_FIND_LIBRARY_SUFFIXES)
set(CMAKE_FIND_LIBRARY_SUFFIXES "${_zlib_ORIG_CMAKE_FIND_LIBRARY_SUFFIXES}")
else()
set(CMAKE_FIND_LIBRARY_SUFFIXES)
endif()
if(DEFINED _zlib_ORIG_CMAKE_FIND_LIBRARY_PREFIXES)
set(CMAKE_FIND_LIBRARY_PREFIXES "${_zlib_ORIG_CMAKE_FIND_LIBRARY_PREFIXES}")
else()
set(CMAKE_FIND_LIBRARY_PREFIXES)
endif()
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include(${CMAKE_CURRENT_LIST_DIR}/SelectLibraryConfigurations.cmake)
select_library_configurations(ZLIB)
endif()
unset(ZLIB_NAMES)
unset(ZLIB_NAMES_DEBUG)
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mark_as_advanced(ZLIB_INCLUDE_DIR)
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if(ZLIB_INCLUDE_DIR AND EXISTS "${ZLIB_INCLUDE_DIR}/zlib.h")
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file(STRINGS "${ZLIB_INCLUDE_DIR}/zlib.h" ZLIB_H REGEX "^#define ZLIB_VERSION \"[^\"]*\"$")
if(ZLIB_H MATCHES "ZLIB_VERSION \"(([0-9]+)\\.([0-9]+)(\\.([0-9]+)(\\.([0-9]+))?)?)")
set(ZLIB_VERSION_STRING "${CMAKE_MATCH_1}")
set(ZLIB_VERSION_MAJOR "${CMAKE_MATCH_2}")
set(ZLIB_VERSION_MINOR "${CMAKE_MATCH_3}")
set(ZLIB_VERSION_PATCH "${CMAKE_MATCH_5}")
set(ZLIB_VERSION_TWEAK "${CMAKE_MATCH_7}")
else()
set(ZLIB_VERSION_STRING "")
set(ZLIB_VERSION_MAJOR "")
set(ZLIB_VERSION_MINOR "")
set(ZLIB_VERSION_PATCH "")
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set(ZLIB_VERSION_TWEAK "")
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endif()
set(ZLIB_MAJOR_VERSION "${ZLIB_VERSION_MAJOR}")
set(ZLIB_MINOR_VERSION "${ZLIB_VERSION_MINOR}")
set(ZLIB_PATCH_VERSION "${ZLIB_VERSION_PATCH}")
set(ZLIB_VERSION "${ZLIB_VERSION_STRING}")
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include(FindPackageHandleStandardArgs)
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find_package_handle_standard_args(ZLIB REQUIRED_VARS ZLIB_LIBRARY ZLIB_INCLUDE_DIR
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VERSION_VAR ZLIB_VERSION
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HANDLE_COMPONENTS)
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if(ZLIB_FOUND)
set(ZLIB_INCLUDE_DIRS ${ZLIB_INCLUDE_DIR})
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if(NOT ZLIB_LIBRARIES)
set(ZLIB_LIBRARIES ${ZLIB_LIBRARY})
endif()
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if(NOT TARGET ZLIB::ZLIB)
add_library(ZLIB::ZLIB UNKNOWN IMPORTED)
set_target_properties(ZLIB::ZLIB PROPERTIES
INTERFACE_INCLUDE_DIRECTORIES "${ZLIB_INCLUDE_DIRS}")
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if(ZLIB_LIBRARY_RELEASE)
set_property(TARGET ZLIB::ZLIB APPEND PROPERTY
IMPORTED_CONFIGURATIONS RELEASE)
set_target_properties(ZLIB::ZLIB PROPERTIES
IMPORTED_LOCATION_RELEASE "${ZLIB_LIBRARY_RELEASE}")
endif()
if(ZLIB_LIBRARY_DEBUG)
set_property(TARGET ZLIB::ZLIB APPEND PROPERTY
IMPORTED_CONFIGURATIONS DEBUG)
set_target_properties(ZLIB::ZLIB PROPERTIES
IMPORTED_LOCATION_DEBUG "${ZLIB_LIBRARY_DEBUG}")
endif()
if(NOT ZLIB_LIBRARY_RELEASE AND NOT ZLIB_LIBRARY_DEBUG)
set_property(TARGET ZLIB::ZLIB APPEND PROPERTY
IMPORTED_LOCATION "${ZLIB_LIBRARY}")
endif()
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endif()
endif()
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cmake_policy(POP)