In Fedora, we have this:
/usr/lib/rpm/macros.d/macros.python:%python_sitelib %(RPM_BUILD_ROOT= %{__python} -Esc "import sysconfig; print(sysconfig.get_path('purelib', vars={'platbase': '%{_prefix}', 'base': '%{_prefix}'}))")
/usr/lib/rpm/macros.d/macros.python3:%python3_sitelib %(RPM_BUILD_ROOT= %{__python3} -Ic "import sysconfig; print(sysconfig.get_path('purelib', vars={'platbase': '%{_prefix}', 'base': '%{_prefix}'}))")
This is a %define-style macro, so the macro gets re-evaluated for every
expansion. It can make spec file operations really, really slow.
It's possible to work around this in spec files like this:
%{?python3_sitearch: %global python3_sitearch %{python3_sitearch}}
But this is quite ugly, and I wonder if there is a nice way to do it
directly in the macros file instead. I think I know how do it with Lua,
but maybe there is a better way?
Thanks,
Florian
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