Merge topic 'png-disable-opt' into release

375afed5 Merge branch 'upstream-png' into png-disable-opt
747aa4bd png-release 2019-03-20 (b422a024)
ae72ec15 png: update to disable architecture optimizations

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !5327

ThirdParty/png/update.sh

@@ -8,7 +8,7 @@ readonly name="png"
 readonly ownership="Libpng Upstream <kwrobot@kitware.com>"
 readonly subtree="ThirdParty/$name/vtk$name"
 readonly repo="https://gitlab.kitware.com/third-party/png.git"
-readonly tag="for/vtk-old"
+readonly tag="for/vtk-old-20190320-1.6.29"
 readonly paths="
 .gitattributes
 CMakeLists.vtk.txt

ThirdParty/png/vtkpng/CMakeLists.txt

@@ -31,6 +31,11 @@ if (WIN32)
   endif ()
 endif ()
 
+add_definitions(-DPNG_ARM_NEON_OPT=0)
+add_definitions(-DPNG_MIPS_MSA_OPT=0)
+add_definitions(-DPNG_POWERPC_VSX_OPT=0)
+add_definitions(-DPNG_INTEL_SSE_OPT=0)
+
 configure_file(
   "${CMAKE_CURRENT_SOURCE_DIR}/vtkpngConfig.h.in"
   "${CMAKE_CURRENT_BINARY_DIR}/vtkpngConfig.h")