On Wed, 20 Oct 2021 02:55:52 +0200
Victor Stinner <vstin...@python.org> wrote:
> 
> Debug build
> -----------
> 
> When Python is built in debug mode, most compiler optimizations are
> disabled.  For example, Visual Studio disables inlining. Benchmarks must
> not be run on a Python debug build, only on release build: using LTO and
> PGO is recommended for reliable benchmarks. PGO helps the compiler to
> decide if function should be inlined or not.

So what is the performance impact on debug builds?  The numbers should
be given in the PEP.

> Rejected Ideas
> ==============
> 
> Keep macros, but fix some macro issues
> --------------------------------------
> 
> Converting macros to functions is not needed to `remove the return
> value`_: casting a macro return value to ``void`` also fix the issue.
> For example, the ``PyList_SET_ITEM()`` macro was already fixed like
> that.
> 
> Macros are always "inlined" with any C compiler.
> 
> The duplication of side effects can be worked around in the caller of
> the macro.
> 
> People using macros should be considered "consenting adults". People who
> feel unsafe with macros should simply not use them.

This says that the idea is rejected, but it does not say *why* it was
rejected.  Can you add that?

Regards

Antoine.


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