An attempt at some MyPaint build instructions for Windows

WINDOWS.md

MyPaint build instructions for Windows

See https://github.com/mypaint/mypaint/blob/master/README_WINDOWS.md for the latest version of this document.

do you install "ming-w64-i686-pkg-config" package?

Yeah I installed the i686 package because I didn't see an x86 link there. Maybe that's it.

I followed the instructions and closed and re-opened the console when I had that error. Tried a few different things.

[edit] it's because I was in the wrong section of course. I was following earlier advice to use the 32 bit version, so I clicked that link and landed in the i686 folder. At the top of that folder is a "Looking for the latest version?" link with the copy that achadwick used.

[edit] I was able to get as far as you do with the exact same results.

Getting further. It appears if I add the path of the newly built json-c.pc to the environment variable it now asks for me to do the same for glib.

edge__000@Hedgehog MINGW32 /tmp/mypaint
$ export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/tmp/json-c/

PKG_CONFIG_PATH=/mingw32/lib/pkgconfig:/mingw32/share/pkgconfig:/tmp/json-c/

edge__000@Hedgehog MINGW32 /tmp/mypaint
$ MSYSTEM= ./scons.py
scons: Reading SConscript files ...

scons: warning: No version of Visual Studio compiler found - C/C++ compilers most likely not set correctly
File "C:\msys64\tmp\mypaint\scons-local-2.3.4/SCons/Script/Main.py", line 602, in _scons_internal_warning
building for 'python' (use scons python_binary=xxx to change)
using 'python-config' (use scons python_config=xxx to change)
Delete(["libmypaint-tests.so", "libmypaint-tests.so", "libmypaint.so", "libmypaintlib.so", "libmypaint.a", "libmypaint-tests.a", "lib/_mypaintlib.so"])
Enabling i18n for brushlib in full application build
Package glib-2.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `glib-2.0.pc'
to the PKG_CONFIG_PATH environment variable
No package 'glib-2.0' found
OSError: 'pkg-config --cflags --libs glib-2.0' exited 1:
File "C:\msys64\tmp\mypaint\SConstruct", line 219:
SConscript('./SConscript')
...

After doing so, I'm stuck here now:

edge__000@Hedgehog MINGW32 /tmp/mypaint
$ export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/mingw32/lib/pkgconfig

edge__000@Hedgehog MINGW32 /tmp/mypaint
$ MSYSTEM= ./scons.py
scons: Reading SConscript files ...

scons: warning: No version of Visual Studio compiler found - C/C++ compilers most likely not set correctly
File "C:\msys64\tmp\mypaint\scons-local-2.3.4/SCons/Script/Main.py", line 602, in _scons_internal_warning
building for 'python' (use scons python_binary=xxx to change)
using 'python-config' (use scons python_config=xxx to change)
Delete(["libmypaint-tests.so", "libmypaint-tests.so", "libmypaint.so", "libmypaintlib.so", "libmypaint.a", "libmypaint-tests.a", "lib/_mypaintlib.so"])
Enabling i18n for brushlib in full application build
ValueError: list.remove(x): x not in list:
  File "C:\msys64\tmp\mypaint\SConstruct", line 219:
    SConscript('./SConscript')
  File "C:\msys64\tmp\mypaint\scons-local-2.3.4/SCons/Script/SConscript.py", line 614:
    return method(*args, **kw)
  File "C:\msys64\tmp\mypaint\scons-local-2.3.4/SCons/Script/SConscript.py", line 551:
    return _SConscript(self.fs, *files, **subst_kw)
  File "C:\msys64\tmp\mypaint\scons-local-2.3.4/SCons/Script/SConscript.py", line 260:
    exec _file_ in call_stack[-1].globals
  File "C:\msys64\tmp\mypaint\SConscript", line 26:
    mypaintlib = SConscript('lib/SConscript')
  File "C:\msys64\tmp\mypaint\scons-local-2.3.4/SCons/Script/SConscript.py", line 614:
    return method(*args, **kw)
  File "C:\msys64\tmp\mypaint\scons-local-2.3.4/SCons/Script/SConscript.py", line 551:
    return _SConscript(self.fs, *files, **subst_kw)
  File "C:\msys64\tmp\mypaint\scons-local-2.3.4/SCons/Script/SConscript.py", line 260:
    exec _file_ in call_stack[-1].globals
  File "C:\msys64\tmp\mypaint\lib\SConscript", line 77:
    env['CPPDEFINES'].remove('NDEBUG')

edge__000@Hedgehog MINGW32 /tmp/mypaint
$

(Build environment: yet another PC. This time my AMD Phenom II 1055T running Win8.1x64. Same version of MinGW that was suggested above.)

Looked up the error message : scons: warning: No version of Visual Studio compiler found - C/C++ compilers most likely not set correctly

Apparently it's exactly what the error is telling us. We need VS. And one forum post suggests that only 2012 will do. Downloading 2012 Express and crossing my fingers.

[edit] doing so eliminated the VS error but did nothing to help with the code attempting to delete from an array in env that doesn't exist.

Edited mypaint/lib/SConscript @ line 75:

# Make sure assertions are enabled
if env.get('CPPDEFINES'):
    try:
        env['CPPDEFINES'].remove('NDEBUG')
    except:
        print('NDEBUG was not enabled, not disabling.')

Then running the build produces the following output:

$ MSYSTEM= ./scons.py
scons: Reading SConscript files ...
building for 'python' (use scons python_binary=xxx to change)
using 'python-config' (use scons python_config=xxx to change)
Delete(["libmypaint-tests.so", "libmypaint-tests.so", "libmypaint.so", "libmypaintlib.so", "libmypaint.a", "libmypaint-tests.a", "lib/_mypaintlib.so"])
Enabling i18n for brushlib in full application build
NDEBUG was not enabled, not disabling.
AttributeError: 'str' object has no attribute 'attributes':
  File "C:\msys64\tmp\mypaint\SConstruct", line 219:
    SConscript('./SConscript')
  File "C:\msys64\tmp\mypaint\scons-local-2.3.4/SCons/Script/SConscript.py", line 614:
    return method(*args, **kw)
  File "C:\msys64\tmp\mypaint\scons-local-2.3.4/SCons/Script/SConscript.py", line 551:
    return _SConscript(self.fs, *files, **subst_kw)
  File "C:\msys64\tmp\mypaint\scons-local-2.3.4/SCons/Script/SConscript.py", line 260:
    exec _file_ in call_stack[-1].globals
  File "C:\msys64\tmp\mypaint\SConscript", line 26:
    mypaintlib = SConscript('lib/SConscript')
  File "C:\msys64\tmp\mypaint\scons-local-2.3.4/SCons/Script/SConscript.py", line 614:
    return method(*args, **kw)
  File "C:\msys64\tmp\mypaint\scons-local-2.3.4/SCons/Script/SConscript.py", line 551:
    return _SConscript(self.fs, *files, **subst_kw)
  File "C:\msys64\tmp\mypaint\scons-local-2.3.4/SCons/Script/SConscript.py", line 260:
    exec _file_ in call_stack[-1].globals
  File "C:\msys64\tmp\mypaint\lib\SConscript", line 102:
    SHLIBPREFIX="",
  File "C:\msys64\tmp\mypaint\lib\SConscript", line 23:
    return env.SharedLibrary(*args, **kwargs)
  File "C:\msys64\tmp\mypaint\scons-local-2.3.4/SCons/Environment.py", line 260:
    return MethodWrapper.__call__(self, target, source, *args, **kw)
  File "C:\msys64\tmp\mypaint\scons-local-2.3.4/SCons/Environment.py", line 224:
    return self.method(*nargs, **kwargs)
  File "C:\msys64\tmp\mypaint\scons-local-2.3.4/SCons/Builder.py", line 633:
    return self._execute(env, target, source, OverrideWarner(kw), ekw)
  File "C:\msys64\tmp\mypaint\scons-local-2.3.4/SCons/Builder.py", line 554:
    tlist, slist = self._create_nodes(env, target, source)
  File "C:\msys64\tmp\mypaint\scons-local-2.3.4/SCons/Builder.py", line 518:
    target, source = self.emitter(target=tlist, source=slist, env=env)
  File "C:\msys64\tmp\mypaint\scons-local-2.3.4/SCons/Builder.py", line 344:
    target, source = e(target, source, env)
  File "C:\msys64\tmp\mypaint\scons-local-2.3.4/SCons/Tool/link.py", line 79:
    tgt.attributes.shared = 1

You don't want to install MSVC, honestly. MSYS2 is all about Open Source code generators, tools and libraries. I gave up on scons about ten years ago since it didn't even grok cross compilation, but AFAIR you need to tell scons to use mingw tools..