[Solved] Build Qt 5.2.1 + VTK 6.1.0 + CMake 2.8.12.2

SGaist

I would say, you are using a "too recent" version of Xcode, have a look at the project for something like "GCC_ENABLE_OBJC_GC = supported;" and remove it

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Sorry im a little lost (just starting with OSX, QT and VTK...). I'm compiling with "make" and i'm not using XCode for anything. Where can i found that option?

SGaist

Somewhere in your Makefile then. grep through them for GCC_ENABLE_OBJC_GC

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Hi again SGaist and thanks for your patience,

I searched for GCC_ENABLE_OBJ_GC at the Makefile, and is not in there. I tried building with XCode and the same error appears, so i looked for that into the "Build Settings" in XCode and it doesn't appear, so i defined it and set it to unsupported (just testing). Again i got the same error (Garbage collection is no longer supported).
By the way, as i see into the "documentation":https://developer.apple.com/library/mac/documentation/DeveloperTools/Reference/XcodeBuildSettingRef/1-Build_Setting_Reference/build_setting_ref.html , the default value is unsupported, but seems that the problem is here because of the message.

I'll be trying to solve this, what do you think?

Thanks again.

SGaist

Did you search in the sources ?

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I searched into the sources, the "Makefile" build and the "XCode" build with GREP recursively into the folder tree but no result was found!

SGaist

And the Xcode project itself ?

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Into the “Build Settings” in XCode i couldn't find it (The documentation says it must be defined there, but if it isn't, it's "unsupported" by default).

Thanks for your help.

SGaist

Did you search for only garbage ?

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Hello again,

Finally I got the answer just searching the web! After the changes i could compile VTK and QT together :).

The problem was at the CMakeLists of VTK and not on the QT ones. It was one feature not supported by XCode as you say (VTK_REQUIRED_OBJCXX_FLAGS ). The problem will be solved in VTK 6.2 as you can see in the Summary of changes: "http://www.vtk.org/Wiki/VTK#Summary_of_Changes":http://www.vtk.org/Wiki/VTK#Summary_of_Changes

If anyone gets this problem, just delete or comment this lines from the CMakeList.txt at the top of the VTK source:

@IF(APPLE)

Being a library, VTK may be linked in either GC (garbage collected)

processes or non-GC processes. Default to "GC supported" so that both

GC and MRR (manual reference counting) are supported.

SET(VTK_OBJCXX_FLAGS_DEFAULT "-fobjc-gc")
SET(VTK_REQUIRED_OBJCXX_FLAGS ${VTK_OBJCXX_FLAGS_DEFAULT} CACHE STRING "Extra flags for Objective-C++ compilation")
MARK_AS_ADVANCED(VTK_REQUIRED_OBJCXX_FLAGS)
ENDIF(APPLE)@

As you see the problem is solved at VTK github repository setting this flag to empty : "VTK CMakeLists":https://github.com/Kitware/VTK/blob/master/CMakeLists.txt

Thank you so much for your help and i hope i will continue contributing here as a Qt developer =).

SGaist

You're welcome !

Glad you found out !

Sure you will :)

Happy coding !