overte/cmake/modules/FindZLIB.cmake

#.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 2000-2014 Kitware, Inc.
# Copyright 2000-2011 Insight Software Consortium
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# * Neither the names of Kitware, Inc., the Insight Software Consortium,
# nor the names of their contributors may be used to endorse or promote
# products derived from this software without specific prior written
# permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#=============================================================================
# (To distribute this file outside of CMake, substitute the full
#  License text for the above reference.)


#  Modified on 2/19/2015 by Stephen Birarda
#  The High Fidelity modification adds a ZLIB_DLL_PATH variable for fixup_bundle on windows

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)
  
  if (WIN32)
    find_path(ZLIB_DLL_PATH NAMES zlib.dll ${${search}} PATH_SUFFIXES bin)
  endif ()
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()

set(ZLIB_REQUIREMENTS ZLIB_LIBRARY ZLIB_INCLUDE_DIR)
if (WIN32)
  list(APPEND ZLIB_REQUIREMENTS ZLIB_DLL_PATH)
endif ()
list(APPEND ZLIB_REQUIREMENTS VERSION_VAR ZLIB_VERSION_STRING)

# handle the QUIETLY and REQUIRED arguments and set ZLIB_FOUND to TRUE if
# all listed variables are TRUE
include(FindPackageHandleStandardArgs)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(ZLIB REQUIRED_VARS ${ZLIB_REQUIREMENTS})

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()
    
    if (WIN32)
      add_path_to_lib_paths(${ZLIB_DLL_PATH})
    endif ()
endif()