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#.rst:
# FindZLIB
# --------
#
# Find the native ZLIB includes and library.
#
# IMPORTED Targets
# ^^^^^^^^^^^^^^^^
#
# This module defines :prop_tgt:`IMPORTED` target ``ZLIB::ZLIB``, if
# ZLIB has been found.
#
# Result Variables
# ^^^^^^^^^^^^^^^^
#
# This module defines the following variables:
#
# ::
#
# 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_STRING - The version of zlib found (x.y.z)
# ZLIB_VERSION_MAJOR - The major version of zlib
# ZLIB_VERSION_MINOR - The minor version of zlib
# ZLIB_VERSION_PATCH - The patch version of zlib
# ZLIB_VERSION_TWEAK - The tweak version of zlib
#
# Backward Compatibility
# ^^^^^^^^^^^^^^^^^^^^^^
#
# The following variable are provided for backward compatibility
#
# ::
#
# ZLIB_MAJOR_VERSION - The major version of zlib
# ZLIB_MINOR_VERSION - The minor version of zlib
# ZLIB_PATCH_VERSION - The patch version of zlib
#
# Hints
# ^^^^^
#
# A user may set ``ZLIB_ROOT`` to a zlib installation root to tell this
# module where to look.
#=============================================================================
# Copyright 2001-2011 Kitware, Inc.
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================
# (To distribute this file outside of CMake, substitute the full
# License text for the above reference.)
set(_ZLIB_SEARCHES)
# Search ZLIB_ROOT first if it is set.
if(ZLIB_ROOT)
set(_ZLIB_SEARCH_ROOT PATHS ${ZLIB_ROOT} NO_DEFAULT_PATH)
list(APPEND _ZLIB_SEARCHES _ZLIB_SEARCH_ROOT)
endif()
# Normal search.
set(_ZLIB_SEARCH_NORMAL
PATHS "[HKEY_LOCAL_MACHINE\\SOFTWARE\\GnuWin32\\Zlib;InstallPath]"
"$ENV{PROGRAMFILES}/zlib"
)
list(APPEND _ZLIB_SEARCHES _ZLIB_SEARCH_NORMAL)
set(ZLIB_NAMES z zlib zdll zlib1 zlibd zlibd1)
# Try each search configuration.
foreach(search ${_ZLIB_SEARCHES})
find_path(ZLIB_INCLUDE_DIR NAMES zlib.h ${${search}} PATH_SUFFIXES include)
find_library(ZLIB_LIBRARY NAMES ${ZLIB_NAMES} ${${search}} PATH_SUFFIXES lib)
endforeach()
mark_as_advanced(ZLIB_LIBRARY ZLIB_INCLUDE_DIR)
if(ZLIB_INCLUDE_DIR AND EXISTS "${ZLIB_INCLUDE_DIR}/zlib.h")
file(STRINGS "${ZLIB_INCLUDE_DIR}/zlib.h" ZLIB_H REGEX "^#define ZLIB_VERSION \"[^\"]*\"$")
string(REGEX REPLACE "^.*ZLIB_VERSION \"([0-9]+).*$" "\\1" ZLIB_VERSION_MAJOR "${ZLIB_H}")
string(REGEX REPLACE "^.*ZLIB_VERSION \"[0-9]+\\.([0-9]+).*$" "\\1" ZLIB_VERSION_MINOR "${ZLIB_H}")
string(REGEX REPLACE "^.*ZLIB_VERSION \"[0-9]+\\.[0-9]+\\.([0-9]+).*$" "\\1" ZLIB_VERSION_PATCH "${ZLIB_H}")
set(ZLIB_VERSION_STRING "${ZLIB_VERSION_MAJOR}.${ZLIB_VERSION_MINOR}.${ZLIB_VERSION_PATCH}")
# only append a TWEAK version if it exists:
set(ZLIB_VERSION_TWEAK "")
if( "${ZLIB_H}" MATCHES "ZLIB_VERSION \"[0-9]+\\.[0-9]+\\.[0-9]+\\.([0-9]+)")
set(ZLIB_VERSION_TWEAK "${CMAKE_MATCH_1}")
set(ZLIB_VERSION_STRING "${ZLIB_VERSION_STRING}.${ZLIB_VERSION_TWEAK}")
endif()
set(ZLIB_MAJOR_VERSION "${ZLIB_VERSION_MAJOR}")
set(ZLIB_MINOR_VERSION "${ZLIB_VERSION_MINOR}")
set(ZLIB_PATCH_VERSION "${ZLIB_VERSION_PATCH}")
endif()
# handle the QUIETLY and REQUIRED arguments and set ZLIB_FOUND to TRUE if
# all listed variables are TRUE
include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(ZLIB REQUIRED_VARS ZLIB_LIBRARY ZLIB_INCLUDE_DIR
VERSION_VAR ZLIB_VERSION_STRING)
if(ZLIB_FOUND)
set(ZLIB_INCLUDE_DIRS ${ZLIB_INCLUDE_DIR})
set(ZLIB_LIBRARIES ${ZLIB_LIBRARY})
if(NOT TARGET ZLIB::ZLIB)
add_library(ZLIB::ZLIB UNKNOWN IMPORTED)
set_target_properties(ZLIB::ZLIB PROPERTIES
IMPORTED_LOCATION "${ZLIB_LIBRARY}"
INTERFACE_INCLUDE_DIRECTORIES "${ZLIB_INCLUDE_DIRS}")
endif()
endif()
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