[reference] Building Krita 3.0 with TDM-GCC (mingw) on Windows

[Boudewijn Rempt]

Hi Alvin!

Thanks for figuring out all of this. The patches will take some
effort to integration, especially the bits where we check whether
we should use patch or myptch -- the mingw check would eval to true
on Linux, and then use the wrong patch, so we need to figure out 
the OS we're compiling on instead of the compiler...

On Fri, 20 May 2016, Alvin Wong wrote:

> Dear all,
>
> Since this had been asked a few times on the irc channel, I think it
> would be a good idea to send this to the mailing list for the record.
>
> I had been building Krita 3.0 with TDM64-GCC 5.1 on Windows since Boud
> switched to cross-compiling Krita for Window with MXE on Linux. Part
> of the process is similar to building with MSVC but some additional
> changes had to be made to get it to compile and run properly.
>
> I've put the stuff here:
> https://gist.github.com/alvinhochun/429129650a38ecd4b3a1d88ef031bb5e
>
> It's not really well-written and is a bit messy. Also, the patches may
> not apply cleanly to the git master branch. To summarize, there is a
> main patch to be applied for building Krita with the default vc 0.75
> (as of Krita 3.0), and another patch to be applied for building with
> vc 1.2 after merging with the `zachmann-vc1-port` branch; there is
> also a batch file which roughly outlined the steps I took to build
> Krita (the script itself is not designed to be run directly due to
> lack of error handling, but individual commands should be copied to a
> command prompt and executed one by one,) and another batch file to
> strip and package the software.
>
> When installing TDM-GCC, please be sure to also install the OpemMP
> package to get the performance boost in gmic. For some reason my CMake
> failed to set the OpenMP flags so I have to append
> `-DOpenMP_C_FLAGS=-fopenmp -DOpenMP_CXX_FLAGS=-fopenmp` to the CMake
> command, but it may be due to me not doing a clean build.
>
> Sorry that I don't have the time to do a proper writeup on the whole
> process, but I think this should be sufficient for now.
>
> Best Regards,
>
> Alvin
>
> CC: stuartmd on freenode (used BCC to hide email)
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-- 
Boudewijn Rempt | http://www.krita.org, http://www.valdyas.org