CMake: Add zlibExport.

CMakeLists.txt

@@ -24,6 +24,7 @@ include(CheckTypeSize)
 include(CheckFunctionExists)
 include(CheckIncludeFile)
 include(CheckCSourceCompiles)
+include(CMakePackageConfigHelpers)
 include(GNUInstallDirs)
 
 #
@@ -158,6 +159,7 @@ if(ZLIB_INSTALL_LIBRARIES)
     if(ZLIB_BUILD_SHARED)
         install(TARGETS zlib
             COMPONENT Runtime
+            EXPORT zlibExport
             RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
             ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
             LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}")
@@ -181,11 +183,32 @@ if(ZLIB_INSTALL_LIBRARIES)
     if(ZLIB_BUILD_STATIC)
         install(TARGETS zlibstatic
             COMPONENT Development
+            EXPORT zlibExport
             RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
             ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
             LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}")
     endif(ZLIB_BUILD_STATIC)
 
+    configure_package_config_file(${zlib_SOURCE_DIR}/zlibConfig.cmake.in
+        ${zlib_BINARY_DIR}/zlibConfig.cmake
+        INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/zlib
+        NO_CHECK_REQUIRED_COMPONENTS_MACRO)
+
+    write_basic_package_version_file(
+        "${zlib_BINARY_DIR}/zlibConfigVersion.cmake"
+        VERSION "${zlib_VERSION}"
+        COMPATIBILITY AnyNewerVersion)
+
+    install(FILES
+        ${zlib_BINARY_DIR}/zlibConfig.cmake
+        ${zlib_BINARY_DIR}/zlibConfigVersion.cmake
+        DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/zlib)
+
+    install(EXPORT zlibExport
+        FILE zlib.cmake
+        DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/zlib
+        NAMESPACE ZLIB::)
+
     install(FILES ${ZLIB_PUBLIC_HDRS}
             COMPONENT Development
             DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}"

zlibConfig.cmake.in

@@ -0,0 +1,2 @@
+@PACKAGE_INIT@
+INCLUDE (${CMAKE_CURRENT_LIST_DIR}/zlib.cmake)