[issue43725] Create a release branch ABI stability regression test

[Pablo Galindo Salgado]

Pablo Galindo Salgado <pablogsal at gmail.com> added the comment:

I started with two PRs against the 64 bits versions for 3.9 and 3.8. This *should* cover 32 bits as well (see previous messages), but if we want specific changes for that we need a 32 bit machine or cross-compilation, but I decided to start with something (that something being 64 bits)

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