[issue43567] regen.vcxproj cannot regenerate some necessary files

[Jiaxin Peng]

Jiaxin Peng <pjx206 at 163.com> added the comment:

`build.bat --regen` produces such error because it uses build tool from visual studio to build regen.vcxproj, and you do not have v142 toolset. I'm using vs2019 and have v142 toolset installed and regen.vcxproj workd, just cannot actually regenerate files needed completely.

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nosy: +pjx206

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<https://bugs.python.org/issue43567>
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