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From f5ed27c9b9efb4756630e5799be14fefdc3b2702 Mon Sep 17 00:00:00 2001
From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Date: Wed, 23 Dec 2015 11:33:14 +0100
Subject: [PATCH] Adjust library/header paths for cross-compilation

When cross-compiling third-party extensions, the get_python_inc() or
get_python_lib() can be called, to return the path to headers or
libraries. However, they use the sys.prefix of the host Python, which
returns incorrect paths when cross-compiling (paths pointing to host
headers and libraries).

In order to fix this, we introduce the _python_sysroot, _python_prefix
and _python_exec_prefix variables, that allow to override these
values, and get correct header/library paths when cross-compiling
third-party Python modules.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
---
 Lib/distutils/command/build_ext.py |  5 ++++-
 Lib/distutils/sysconfig.py         | 15 +++++++++++----
 2 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/Lib/distutils/command/build_ext.py b/Lib/distutils/command/build_ext.py
index 2d7cdf063f..cba150075c 100644
--- a/Lib/distutils/command/build_ext.py
+++ b/Lib/distutils/command/build_ext.py
@@ -234,7 +234,10 @@ class build_ext(Command):
         if (sysconfig.get_config_var('Py_ENABLE_SHARED')):
             if not sysconfig.python_build:
                 # building third party extensions
-                self.library_dirs.append(sysconfig.get_config_var('LIBDIR'))
+                libdir = sysconfig.get_config_var('LIBDIR')
+                if "_python_sysroot" in os.environ:
+                    libdir = os.environ.get("_python_sysroot") + libdir
+                self.library_dirs.append(libdir)
             else:
                 # building python standard extensions
                 self.library_dirs.append('.')
diff --git a/Lib/distutils/sysconfig.py b/Lib/distutils/sysconfig.py
index b51629eb94..011a437bcd 100644
--- a/Lib/distutils/sysconfig.py
+++ b/Lib/distutils/sysconfig.py
@@ -18,10 +18,17 @@ from .errors import DistutilsPlatformError
 from .util import get_platform, get_host_platform
 
 # These are needed in a couple of spots, so just compute them once.
-PREFIX = os.path.normpath(sys.prefix)
-EXEC_PREFIX = os.path.normpath(sys.exec_prefix)
-BASE_PREFIX = os.path.normpath(sys.base_prefix)
-BASE_EXEC_PREFIX = os.path.normpath(sys.base_exec_prefix)
+if "_python_sysroot" in os.environ:
+    _sysroot=os.environ.get('_python_sysroot')
+    PREFIX = os.path.normpath(_sysroot + os.environ.get('_python_prefix'))
+    EXEC_PREFIX = os.path.normpath(_sysroot + os.environ.get('_python_exec_prefix'))
+    BASE_PREFIX = PREFIX
+    BASE_EXEC_PREFIX = EXEC_PREFIX
+else:
+    PREFIX = os.path.normpath(sys.prefix)
+    EXEC_PREFIX = os.path.normpath(sys.exec_prefix)
+    BASE_PREFIX = os.path.normpath(sys.base_prefix)
+    BASE_EXEC_PREFIX = os.path.normpath(sys.base_exec_prefix)
 
 # Path to the base directory of the project. On Windows the binary may
 # live in project/PCbuild/win32 or project/PCbuild/amd64.
-- 
2.20.1