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🐛 fix(py_info): report missing include paths - #182
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… are missing
An interpreter installed without its C headers, such as Ubuntu's python3 without python3-dev, has no include directory.
On Python 3.11 and later system_include then returned the interpreter's prefix, which always exists, so a caller that
checks the path sees an include directory with no headers in it.
The broken packaging fallback joins the parent of the distutils headers path onto the prefix. Without distutils, as on
3.11 and later and on Debian's 3.10, there is no headers path, install_path("headers") is empty and the join gives the
prefix itself. The fallback now only runs when there is a headers path to use, so the missing sysconfig include path
comes back instead. Tests now cover the branch, so it loses its no cover pragma.
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PythonInfo.system_includecould return an interpreter's prefix when the include directory was absent. A caller checking whether that path exists could mistake the prefix for installed C headers.The packaging fallback now runs only when a headers installation path is available. Otherwise, discovery returns the sysconfig include path, which callers can check for existence.