[gentoo-dev] [PATCH 1/2] python-utils-r1.eclass: Enable hardlinking of identical pyc files for py3.9+

[Mart Raudsepp]

Python 3.9 includes a new feature for compileall to automatically hardlink
different optimization level cache files if they are identical. Make use of it
for python_optimize for some space savings.
This however does not cover distutils use cases and python itself.
---
 eclass/python-utils-r1.eclass | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Note that I haven't actually tested this on py3.9, as I'm skipping that version.
It appears to do what it's meant to with py3.10

diff --git a/eclass/python-utils-r1.eclass b/eclass/python-utils-r1.eclass
index 3dbf221eac5..e2f05606993 100644
--- a/eclass/python-utils-r1.eclass
+++ b/eclass/python-utils-r1.eclass
@@ -626,12 +626,15 @@ python_optimize() {
                                "${PYTHON}" -m compileall -q -f -d "${instpath}" "${d}"
                                "${PYTHON}" -OO -m compileall -q -f -d "${instpath}" "${d}"
                                ;;
-                       python*|pypy3)
+                       python3.[5678]|pypy3)
                                # both levels of optimization are separate since 3.5
                                "${PYTHON}" -m compileall -q -f -d "${instpath}" "${d}"
                                "${PYTHON}" -O -m compileall -q -f -d "${instpath}" "${d}"
                                "${PYTHON}" -OO -m compileall -q -f -d "${instpath}" "${d}"
                                ;;
+                       python*)
+                               "${PYTHON}" -m compileall -o 0 -o 1 -o 2 --hardlink-dupes -q -f -d "${instpath}" "${d}"
+                               ;;
                        *)
                                "${PYTHON}" -m compileall -q -f -d "${instpath}" "${d}"
                                ;;