meson: Improve/fix Python version selection

petere · petere · commit 489ca33081c8 · 2023-11-30T07:27:17.000+01:00
When we look for the Python installation using the meson python module, we should make it use the python program previously determined by the 'PYTHON' option. Otherwise, it will just use its own search and the 'PYTHON' option won't affect it. We need this to be able to select the Python installation to build PL/Python against. Reviewed-by: Andres Freund <andres@anarazel.de> Discussion: https://www.postgresql.org/message-id/flat/3f5427e8-cef6-474d-ae88-13db1bfdc1a7%40eisentraut.org
diff --git a/meson.build b/meson.build
@@ -1063,7 +1063,7 @@ pyopt = get_option('plpython')
 python3_dep = not_found_dep
 if not pyopt.disabled()
   pm = import('python')
-  python3_inst = pm.find_installation(required: pyopt)
+  python3_inst = pm.find_installation(python.path(), required: pyopt)
   if python3_inst.found()
     python3_dep = python3_inst.dependency(embed: true, required: pyopt)
     # Remove this check after we depend on Meson >= 1.1.0
