appveyor failures

looking here for build expertise apologies if not suitable

After a python source change one of my appveyor builds has started to fail compiling an extension. The previous build 
28/August succeeded completely, but now I see a failure in the third sub-build. No change was made in the c source code.

Python 2.7 X86 OK
Python 2.7 AMD64 OK
Python 3.5 X86 Fails compiling _renderPM.c at line 2150

> C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\BIN\cl.exe /c /nologo /Ox /W3 /GL /DNDEBUG /MD -DRENDERPM_FT -DLIBART_COMPILATION -DLIBART_VERSION=\"2.3.21\" -Isrc\rl_addons\renderPM -Isrc\rl_addons\renderPM\libart_lgpl -Isrc\rl_addons\renderPM\gt1 -Iwinstuff\include\freetype2 -Ic:\Python35\include -Ic:\Python35\include -IC:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE -IC:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\ATLMFC\INCLUDE -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\ucrt -IC:\Program Files (x86)\Windows Kits\NETFXSDK\4.6.1\include\um -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\shared -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\um -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\winrt
  /Tcsrc\rl_addons\renderPM\_renderPM.c /Fobuild\temp.win32-3.5\Release\src\rl_addons\renderPM\_renderPM.obj
> _renderPM.c
> src\rl_addons\renderPM\_renderPM.c(2150): error C2017: illegal escape sequence
> src\rl_addons\renderPM\_renderPM.c(2150): error C2001: newline in constant
> src\rl_addons\renderPM\_renderPM.c(2151): error C2143: syntax error: missing ')' before 'if'
> error: command 'C:\\Program Files (x86)\\Microsoft Visual Studio 14.0\\VC\\BIN\\cl.exe' failed with

the code there looks like this
	
	PyModule_AddObject(m, "_version", obj);

	obj = PyUnicode_FromString(LIBART_VERSION);  /* this is line 2150 */
	if(!obj)goto err;
	PyModule_AddObject(m, "_libart_version", obj);

so it looks like the -DLIBART_VERSION=\"2.3.21\"  is failing to pass stuff correctly.

The Aug 28 build that worked perfectly used this command line
> C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\BIN\cl.exe /c /nologo /Ox /W3 /GL /DNDEBUG /MD -DRENDERPM_FT -DLIBART_COMPILATION -DLIBART_VERSION=\"2.3.21\" -Isrc\rl_addons\renderPM -Isrc\rl_addons\renderPM\libart_lgpl -Isrc\rl_addons\renderPM\gt1 -Iwinstuff\include\freetype2 -Ic:\Python35\include -Ic:\Python35\include "-IC:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE" "-IC:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\ATLMFC\INCLUDE" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\ucrt" "-IC:\Program Files (x86)\Windows Kits\NETFXSDK\4.6.1\include\um" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\shared" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\um" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.
 18362.0\winrt" /Tcsrc\rl_addons\renderPM\_renderPM.c /Fobuild\temp.win32-3.5\Release\src\rl_addons\renderPM\_renderPM.obj

which looks identical.

So it must be the environment/image. The build image is set at Visual Studio 2015. I tried using the previous image, but 
no luck there. Any ideas / advice welcome.

Should I be using a stringify macro?

-- 
Robin Becker
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