[3.4] bpo-31170: Fix inclusion of expat in Windows build projects #3785
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Co-Authored-By: Steve Dower <steve.dower@microsoft.com>
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I wanted to test my PR on Windows, but VS 2015 fails to build Python 3.4, and my VS 2010 license is not more valid. My PR #3353 upgraded expat to 2.2.4, @larryhastings merged it 3 days ago. Problem: AppVeyor didn't run on PR #3353, whereas on this PR, AppVeyor runs and fails on building expat. Travis CI and AppVeyor were enabled on Python 3.4 by the PR #2475. This one was merged at 22 Jul 2017. |
The standard header stdbool.h is not available with old Visual Studio compilers Cherry-picked from libexpat commit b4b89c2ab0cc5325a41360c25ef9d2ccbe617e5c. expat: Add artificial scopes in xmltok.c utf8_toUtf8() to fix c89 compilation. Cherry-picked from libexpat commit e0b290eb3d8f4c4b45137a7d7f4f8db812145bd2
Remove the following defines: * BYTEORDER=1234 * HAVE_MEMMOVE * USE_PYEXPAT_CAPI * XML_CONTEXT_BYTES=1024 * XML_DTD * XML_NS * XML_STATIC
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Ok. I found a VS 2010 license in my MSDN subscription. I fixed C defines in PCbuild/ and PC/VS9.0/ projects (_elementtree and pyexpat). I also cherry-picked the 2 fixes for Visual Studio older than 2015 from libexpat, I used code from Python 2.7 (already merged). I built _elementtree and pyexpat projects in Debug|x64 mode: they build correctly without any warning. |
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Cool, CIs are happy (green). AppVeyor succeeded to build expat and to run the test suite ("351 tests OK.") :-) |
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@larryhastings: Basically, this PR makes Python 3.4 compilable again on Windows. |
| align_limit_to_full_utf8_characters(*fromP, &fromLim); | ||
| if (fromLim < fromLimBefore) { | ||
| input_incomplete = true; | ||
| } |
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I realize I'm nit-picking, but: why were these two paragraphs of code (this section, and the next starting at 425) indented inside blocks? Is this change really a security fix?
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This is the second commit of this PR and it was cherry-picked from upstream.
Without this code, compilation fails on Visual Studio 2010 which uses C89, not C99. So Python 3.4 users on Windows cannot get the latest Python 3.4 fixes.
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This PR isn't directly a security fix. It only allows to build Python 3.4 with latest security fixes on Windows. |
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Okay, but is that change actually relevant? Please tell me how it can't build on Windows right now, but adding curly braces and indenting allows it to build. It looks like someone added curly braces and indented a block as an experiment during debugging, then forgot to undo that change before creating the PR. |
ISO C89 disallows the declaration of variables "in the middle of the code". "int a; a = 1; int b;" in illegal in C89.
"int a; a = 1; { int b; }" is legal in C89.
I cherry-picked the commit from upstream: |
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Okay, I'll buy that. |
Co-Authored-By: Steve Dower steve.dower@microsoft.com
https://bugs.python.org/issue31170