./configure --without-sage-venv

[mkoeppe]

(split out from #29013)

In this ticket we add support for ./configure --with-sage-venv=no, which would suppress making any Python venv and suppress building any Python packages.

In this configuration, sage_conf cannot be built as a wheel, so we only build an sdist (using sage-bootstrap-python!) and store that in $SAGE_LOCAL/var/lib/sage/wheels.

Also, the default target all-start makes no sense, and also the docbuild cannot be done. Instead, the default would be to build only the target all-sage (which would be modified to remove the unnecessary special case sagelib).

This is for users who prefer to install Python packages into their own virtual environments using standard Python tools.

[mkoeppe]

To disable building Python packages, the make targets would be replaced by dummy targets in the same way as it is done for packages found by spkg-configure.

In addition, this could go through #30383 ("configure --disable-SPKG" for standard packages) so that configure already shows that the build is disabled for Python packages.

[mkoeppe]

Last 10 new commits:

​f9ac70e	Add install-requires.txt for setuptools, pip
​f6a2c56	Merge tag '9.3.beta1' into t/30719/add_build_pkgs_spkg_install_requires_txt_for_all_python_packages
​e61929d	build/pkgs/sphinx/install-requires.txt: Update from gentoo
​8fe0e35	build/pkgs/python_openid: Unused, remove
​ba1d913	build/pkgs/itsdangerous: Unused, remove
​bb6c4ae	build/pkgs/tox/install-requires.txt: New
​d507501	build/pkgs/networkx/install-requires.txt: Update from gentoo
​c3a9352	build/pkgs/pathpy/install-requires.txt: Package removed in #30611, remove
​ebd4610	build/pkgs/pynac/install-requires.txt: New
​e25b833	Merge branch 't/30719/add_build_pkgs_spkg_install_requires_txt_for_all_python_packages' into t/30896/__configure___without_python

[mkoeppe]

Hoping we can make progress on this ticket this week - ​https://wiki.sagemath.org/days111

[git]

Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:

​fa13bfa	build/pkgs/python3/spkg-configure.m4: Accept --with-python=no
​17869af	m4/sage_spkg_collect.m4: If configured --without-python, mark all Python packages as not required

[git]

Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:

​fec4b06	fix sage -b after 30622
​dff846c	go through make/build/install
​8aff784	build/pkgs/python3/spkg-configure.m4: Accept --with-python=no
​932ebd8	m4/sage_spkg_collect.m4: If configured --without-python, mark all Python packages as not required

[mkoeppe]

Sage development has entered the release candidate phase for 9.3. Setting a new milestone for this ticket based on a cursory review of ticket status, priority, and last modification date.