From 41f78746cbe88d263400ee948abef5b3f89cce29 Mon Sep 17 00:00:00 2001
From: Alexander Kanavin <alex@linutronix.de>
Date: Wed, 11 May 2022 21:41:14 +0200
Subject: [PATCH] _distutils/sysconfig.py: make it possible to substite the
 prefix to target sysroot

This is done by probing STAGING_INCDIR/STAGING_LIBDIRenv vars:
not the most elegant solution, but distutils/sysconfig has been
tweaked to do this for many, many year, and so it's easiest
to replicate here as well, the original is
meta/recipes-devtools/python/python3/12-distutils-prefix-is-inside-staging-area.patch

I'm not sure exactly why setuptools now needs a copy, and what
would happen to this module in light of distutils deprecation.

Upstream-Status: Inappropriate [oe-core specific]
Signed-off-by: Alexander Kanavin <alex@linutronix.de>
---
 setuptools/_distutils/sysconfig.py | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/setuptools/_distutils/sysconfig.py b/setuptools/_distutils/sysconfig.py
index 55a42e1..ead63b9 100644
--- a/setuptools/_distutils/sysconfig.py
+++ b/setuptools/_distutils/sysconfig.py
@@ -102,7 +102,9 @@ def get_python_inc(plat_specific=0, prefix=None):
     If 'prefix' is supplied, use it instead of sys.base_prefix or
     sys.base_exec_prefix -- i.e., ignore 'plat_specific'.
     """
-    if prefix is None:
+    if prefix is None and os.environ.get('STAGING_INCDIR', ""):
+        prefix = os.environ['STAGING_INCDIR'].rstrip('include')
+    elif prefix is None:
         prefix = plat_specific and BASE_EXEC_PREFIX or BASE_PREFIX
     if os.name == "posix":
         if IS_PYPY and sys.version_info < (3, 8):
@@ -167,7 +169,13 @@ def get_python_lib(plat_specific=0, standard_lib=0, prefix=None):
 
     early_prefix = prefix
 
-    if prefix is None:
+    if os.environ.get('STAGING_LIBDIR', ""):
+        lib_basename = os.environ['STAGING_LIBDIR'].split('/')[-1]
+    else:
+        lib_basename = "lib"
+    if prefix is None and os.environ.get('STAGING_LIBDIR', ""):
+        prefix = os.environ['STAGING_LIBDIR'].rstrip(lib_basename)
+    elif prefix is None:
         if standard_lib:
             prefix = plat_specific and BASE_EXEC_PREFIX or BASE_PREFIX
         else:
@@ -182,7 +190,7 @@ def get_python_lib(plat_specific=0, standard_lib=0, prefix=None):
             # Pure Python
             libdir = "lib"
         implementation = 'pypy' if IS_PYPY else 'python'
-        libpython = os.path.join(prefix, libdir,
+        libpython = os.path.join(prefix, lib_basename,
                                  implementation + get_python_version())
         return _posix_lib(standard_lib, libpython, early_prefix, prefix)
     elif os.name == "nt":