COMP: Remove Superbuild zlib

Build warnings are preventing a clean dashboard, we no longer bulid
CPython, and we are reducing our dependency on VTK -- just use the
vendored version in ITK.

Author: thewtex

Superbuild/External-ITK.cmake

@@ -44,14 +44,6 @@ if(APPLE)
     "-DBUILD_SHARED_LIBS:BOOL=ON"
     )
 endif()
-set(_windows_args)
-set(_zlib_deps zlib)
-if(WIN32)
-  set(_windows_args
-    "-DITK_USE_SYSTEM_ZLIB:BOOL=OFF"
-    )
-  set(_zlib_deps )
-endif()
 
 ExternalProject_Add(ITK
   GIT_REPOSITORY "${git_protocol}://github.com/InsightSoftwareConsortium/ITK.git"
@@ -68,17 +60,12 @@ ExternalProject_Add(ITK
     -DModule_ITKReview:BOOL=ON
     -DITK_LEGACY_SILENT:BOOL=ON
     -DExternalData_OBJECT_STORES:STRING=${ExternalData_OBJECT_STORES}
-    "-DITK_USE_SYSTEM_ZLIB:BOOL=ON"
-    "-DZLIB_ROOT:PATH=${ZLIB_ROOT}"
-    "-DZLIB_INCLUDE_DIR:PATH=${ZLIB_INCLUDE_DIR}"
-    "-DZLIB_LIBRARY:FILEPATH=${ZLIB_LIBRARY}"
     ${_vtk_args}
     ${_opencv_args}
     ${_wrap_python_args}
     ${_apple_args}
-    ${_windows_args}
   INSTALL_COMMAND ${CMAKE_COMMAND} -E echo "ITK install skipped"
-  DEPENDS ${ITK_DEPENDENCIES} ${_python_depends} ${_zlib_deps}
+  DEPENDS ${ITK_DEPENDENCIES} ${_python_depends}
   LOG_BUILD 0
 )
 

Superbuild/External-VTK.cmake

@@ -24,14 +24,9 @@ ExternalProject_Add(VTK
     -DVTK_WRAP_PYTHON:BOOL=ON
     -DExternalData_OBJECT_STORES:STRING=${ExternalData_OBJECT_STORES}
     "-DPython3_EXECUTABLE:FILEPATH=${PYTHON_EXECUTABLE}"
-    -DVTK_USE_SYSTEM_ZLIB:BOOL=ON
-    "-DZLIB_ROOT:PATH=${ZLIB_ROOT}"
-    "-DZLIB_INCLUDE_DIR:PATH=${ZLIB_INCLUDE_DIR}"
-    "-DZLIB_LIBRARY:FILEPATH=${ZLIB_LIBRARY}"
   INSTALL_COMMAND ""
   LOG_DOWNLOAD 0
   LOG_UPDATE 0
-  DEPENDS zlib
 )
 
 set(VTK_DIR ${CMAKE_BINARY_DIR}/VTK-build)

Superbuild/External-zlib.cmake

@@ -32,10 +32,6 @@ set(ITKSphinxExamples_DEPENDENCIES )
 set(ITK_DEPENDENCIES )
 
 option(ITKSphinxExamples_USE_VTK "Add VTK to the superbuild." OFF)
-# Used by ITK, VTK, -- always build it.
-if(NOT WIN32 OR ITKSphinxExamples_USE_VTK AND NOT VTK_DIR)
-  include(${CMAKE_SOURCE_DIR}/External-zlib.cmake)
-endif()
 
 option(ITKSphinxExamples_USE_OpenCV "Add OpenCV to the superbuild" OFF)
 if(NOT OpenCV_DIR AND ITKSphinxExamples_USE_OpenCV)