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This does a couple of things:
1. Scrape the `Py_GIL_DISABLED` sysconfig var, which is the best way as of today
to determine whether the target interpreter was built with `--disable-gil`
2. link against the correct libpython
3. On Windows, work around a known issue in the python.org installer with a
missing define in `pyconfig.h`, which the CPython devs have said is unlikely
to be fixed since headers are shared between the regular and free-threaded
builds in a single NSIS installer.
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On python >=3.8, this information is expected to be encoded in the
sysconfig vars.
In distutils, it is always necessary to link to libpython on Windows;
for posix platforms, it depends on the value of LIBPYTHON (which is the
library to link to, possibly the empty string) as generated by
configure.ac and embedded into python.pc and python-config.sh, and then
coded a second time in the distutils python sources.
There are a couple of caveats which have ramifications for Cygwin and
Android:
- python.pc and python-config.sh disagree with distutils when python is
not built shared. In that case, the former act the same as a shared
build, while the latter *never* links to libpython
- python.pc disagrees with python-config.sh and distutils when python is
built shared. The former never links to libpython, while the latter do
The disagreement is resolved in favor of distutils' behavior in all
cases, and python.pc is correct for our purposes on python 3.12; see:
https://github.com/python/cpython/pull/100356
https://github.com/python/cpython/pull/100967
Although it was not backported to older releases, Cygwin at least has
always patched in a fix for python.pc, which behavior is now declared
canonical. We can reliably assume it is always correct.
This is the other half of the fix for #7702
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Since 3.10.3, Debian finally started patching sysconfig with custom
paths, instead of just distutils. This means we can now go use that
instead. It reduces our reliance on the deprecated distutils module.
Partial fix for #7702
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This commit adds a new keyword arg to extension_module() that enables
a user to target the Python Limited API, declaring the version of the
limited API that they wish to target.
Two new unittests have been added to test this functionality.
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It seems this happens because at some point setuptools imports gettext,
and we have a script by the same name.
In general, this path injection by default is bad news for our use case.
Python 3.11 introduced -P for this reason, but we cannot depend on that.
Instead, check for it first, and delete it, before doing more imports.
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We write this out as an embedded string to a tempfile in order to run
it, which is pretty awkward. And usually Meson's files are already files
on disk, not packed into a zip, so we can simply run it directly. Since
python 3.7, which is our new minimum, we can handle this well via the
stdlib. (There's also mesonbuild.mesondata, but we do not need
persistence in the builddir.)
This also solves the problem that has always been there, of giant python
programs inside strings occasionally confusing syntax highlighters. Or
even, it would be nice if we had syntax highlighting for this
introspection program. :D
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