Sam Gross <colesb...@gmail.com> added the comment:

It may be worth considering C-API extensions written in C++. Flexible array 
members are not part of the C++ standard, although GCC, Clang, and MSVC support 
them as an extension. GCC and Clang will issue warnings with `-Wpedantic` and 
MSVC will issue warnings with `/Wall`. Currently, C++ code that includes 
`<Python.h>` is warning-free in GCC (g++) even with `-Wpedantic`. That won't be 
true after this change, unless Py_LIMITED_API is defined.

Note that GCC also explicitly supports trailing one-element arrays (the current 
pattern) as an extension. https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html

----------
nosy: +colesbury

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<https://bugs.python.org/issue40120>
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