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Release Note Type:
Feature
Release Note Text:

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Feature, enhancement (describe the feature or enhancement from the user’s point of view):
Reason (why has the feature or enhancement been implemented):
Result (what is the current user experience):

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Feature, enhancement (describe the feature or enhancement from the user’s point of view): Reason (why has the feature or enhancement been implemented): Result (what is the current user experience):
Release Note Status:
Proposed

Provide a convenient and (eventually) supportable way to change the built-in defaults of /usr/bin/gcc, /usr/bin/g++, /usr/bin/gfortran.
These changes should be effective independently of the build system, and similar to what GCC already supports at configure time using the --with-arch_64= option. (However, it should not be implemented as a separate build of GCC.)

When building extensions, pip install should switch to the new architecture level automatically.
The configuration survives updates of the gcc, gcc-c++, gcc-gfortran packages.
By default, the build flags should be upgraded to -march=x86-64-v3 for all language front ends.
There should be a way to use -march=native instead.
Maybe there should be a way to configure the override to use the latest installed GCC Toolset version (if any).