located zlib in vtk

Author: basisunus

Superbuild/VtkExternal.cmake

@@ -63,7 +63,13 @@ ExternalProject_Add(VTK_external
     -DVTK_MODULE_USE_EXTERNAL_VTK_zlib:BOOL=ON
 
     # ---- Help VTK locate them (minimal first pass) ----
-    -DZLIB_ROOT=${ZLIB_INSTALL_DIR}
+    # headers
+    -DZLIB_INCLUDE_DIR:PATH=${ZLIB_SOURCE_DIR}
+
+    # library (platform-aware)
+    -DZLIB_LIBRARY:FILEPATH=
+    "$<$<PLATFORM_ID:Windows>:${ZLIB_BINARY_DIR}/$<CONFIG>/z.lib>
+     $<$<NOT:$<PLATFORM_ID:Windows>>:${ZLIB_BINARY_DIR}/libz.a>"
 
     # ---- Wrapping ----
     -DVTK_WRAP_PYTHON:BOOL=OFF

Superbuild/ZlibExternal.cmake

@@ -33,13 +33,7 @@ ExternalProject_Add(Zlib_external
   GIT_REPOSITORY "https://github.com/CIBC-Internal/zlib.git"
   GIT_TAG ${zlib_GIT_TAG}
 
-  INSTALL_DIR ${ep_base}/Install/zlib
-
-  INSTALL_COMMAND
-    ${CMAKE_COMMAND} -E make_directory <INSTALL_DIR>/lib
-    COMMAND ${CMAKE_COMMAND} -E make_directory <INSTALL_DIR>/include
-    COMMAND ${CMAKE_COMMAND} -E copy <BINARY_DIR>/Release/zlib.lib <INSTALL_DIR>/lib
-    COMMAND ${CMAKE_COMMAND} -E copy <SOURCE_DIR>/zlib.h <INSTALL_DIR>/include
+  INSTALL_COMMAND ""
 
   CMAKE_CACHE_ARGS
     -DCMAKE_VERBOSE_MAKEFILE:BOOL=${CMAKE_VERBOSE_MAKEFILE}
@@ -48,6 +42,10 @@ ExternalProject_Add(Zlib_external
 )
 
 ExternalProject_Get_Property(Zlib_external BINARY_DIR)
+ExternalProject_Get_Property(Zlib_external SOURCE_DIR)
+
 SET(Zlib_DIR ${BINARY_DIR} CACHE PATH "")
+set(ZLIB_BINARY_DIR ${BINARY_DIR})
+set(ZLIB_SOURCE_DIR ${SOURCE_DIR})
 
 MESSAGE(STATUS "Zlib_DIR: ${Zlib_DIR}")