pyOCIO Windows compilation error against Python36

[renau...@fusefx.com]

I downloaded the latest OCIO code from GitHub (1.1.0) and I was able to compile OCIO using "Visual Studio 2015" as-well as pyOpenColorIO against Python27.

However when I tried to compile it against Python36 I get the following error:

...

9>  PyLogTransform.cpp
9>  PyLook.cpp
9>  PyLookTransform.cpp
9>  PyMain.cpp
9>D:\Development\Libraries\src\ocio\src\bindings\python\PyMain.cpp(153): error C2059: syntax error: '__declspec(dllexport)'
9>D:\Development\Libraries\src\ocio\src\bindings\python\PyMain.cpp(154): error C2143: syntax error: missing ';' before '{'
9>D:\Development\Libraries\src\ocio\src\bindings\python\PyMain.cpp(154): error C2447: '{': missing function header (old-style formal list?)
9>  PyMatrixTransform.cpp
9>  PyProcessor.cpp
9>  PyProcessorMetadata.cpp
9>  Generating Code...
9>  Compiling...
9>  PyRangeTransform.cpp
9>  PyTransform.cpp
9>  PyUtil.cpp
9>  Generating Code...
========== Build: 8 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Line 153 points to this :

OCIO_NAMESPACE_EXIT

MOD_INIT(PyOpenColorIO)
{
    PyObject * m;
    MOD_DEF(m, OCIO_STRINGIFY(PYOCIO_NAME), OCIO::OPENCOLORIO__DOC__, PyOCIO_methods);

MOD_INIT definition looks like this:

pyMain.cpp

...
#if PY_MAJOR_VERSION >= 3
  #define MOD_ERROR_VAL NULL
  #define MOD_SUCCESS_VAL(val) val
  #define MOD_INIT(name) PyMODINIT_FUNC EXPORT_SYMBOL PyInit_##name(void)
  #define MOD_DEF(ob, name, doc, methods) \
          static struct PyModuleDef moduledef = { \
            PyModuleDef_HEAD_INIT, name, doc, -1, methods, NULL, NULL, NULL, NULL}; \
          ob = PyModule_Create(&moduledef);

pyMODINIT_FUNC is defined here:

PyUtil.h

...
        /* module init functions outside the core must be exported */
#                       if defined(__cplusplus)
#                               define PyMODINIT_FUNC extern "C" __declspec(dllexport) PyObject*
#                       else /* __cplusplus */
#                               define PyMODINIT_FUNC __declspec(dllexport) PyObject*
#                       endif /* __cplusplus */

and EXPORT_SYMBOL here:

PyUtil.h

#ifdef WIN32
    #define EXPORT_SYMBOL _declspec(dllexport)
#else
    #define EXPORT_SYMBOL
#endif

I checked online to see if I could figure out what's causing the issue but I couldn't figure it out. Anybody would know why this is happening ?

Was anyone able to compile OCIO 1.1.0 | Win64 | Visual Studio 2015 | Python36 (official 64 bit build) ?

Thanks.

[Richard Shaw]

On Sun, Jan 27, 2019 at 12:05 AM <renau...@fusefx.com> wrote:

I downloaded the latest OCIO code from GitHub (1.1.0) and I was able to compile OCIO using "Visual Studio 2015" as-well as pyOpenColorIO against Python27.

I checked online to see if I could figure out what's causing the issue but I couldn't figure it out. Anybody would know why this is happening ?

Was anyone able to compile OCIO 1.1.0 | Win64 | Visual Studio 2015 | Python36 (official 64 bit build) ?

My guess is that it hasn't been updated for Python3 yet... There are some incompatible changes.

You can try a converter and see if it takes care of the errors but beware any unintended side effects...

http://www.pythonconverter.com/

Thanks,

Richard 

[Patrick Hodoul]

Hi Guys,

 

Thanks for your investigations around Python 3. 

 

OCIO does not currently support Python 3. But it would be appreciated to have a pull request fixing the Python 3 support   :-)

 

Patrick.

[Richard Shaw]

I had completely forgotten that I moved the Fedora package over to Python 3.7 and haven't had any build issues... Now that being said I don't know if there's any consumers of the python library in Fedora...

https://koji.fedoraproject.org/koji/buildinfo?buildID=1183572

Feel free to poke around the build logs...

Here's the spec file for building... Some of it won't make sense to you but you can review the settings / cmake options I use.

https://src.fedoraproject.org/rpms/OpenColorIO/blob/master/f/OpenColorIO.spec

Thanks,

Richard

[Renaud Talon]

Hi Richard,

 

Thank you for your suggestions, I did look into your diff files but I couldn’t find anything that’s not already added to the current versions of the files.

I got it to compile with Windows 10 / Python 3.6 – Visual Studio 2015, by changing the following line in “pyUtil.h” (line 65):

from :

  #define MOD_INIT(name) PyMODINIT_FUNC EXPORT_SYMBOL PyInit_##name(void)

 

to:

  #define MOD_INIT(name) EXPORT_SYMBOL PyMODINIT_FUNC PyInit_##name(void)

 

I did get a warning message though but the compilation process went through and the “.pyd” file was generated.

I’m honestly no C++ expert so I’m not sure if this makes sense but it seems to work. I need to run further testing next week to confirm but so far so good.

 

Thanks again,

Renaud

 

 

---

From: ocio...@googlegroups.com <ocio...@googlegroups.com> on behalf of Richard Shaw <hobbe...@gmail.com>
Sent: Monday, February 4, 2019 8:45:08 AM
To: ocio...@googlegroups.com
Subject: Re: [ocio-dev] pyOCIO Windows compilation error against Python36

 

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