package/python/0007-Adjust-library-header-paths-for-cross-compilation.patch

   1 From f3e0a677c4736f95338825a022a884f8dc7a5c14 Mon Sep 17 00:00:00 2001
   2 From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
   3 Date: Tue, 7 Mar 2017 22:22:19 +0100
   4 Subject: [PATCH] Adjust library/header paths for cross-compilation
   5
   6 When cross-compiling third-party extensions, the get_python_inc() or
   7 get_python_lib() can be called, to return the path to headers or
   8 libraries. However, they use the sys.prefix of the host Python, which
   9 returns incorrect paths when cross-compiling (paths pointing to host
  10 headers and libraries).
  11
  12 In order to fix this, we introduce the _python_sysroot, _python_prefix
  13 and _python_exec_prefix variables, that allow to override these
  14 values, and get correct header/library paths when cross-compiling
  15 third-party Python modules.
  16
  17 The _python_sysroot variable is also used to prefix the LIBDIR value
  18 taken from the sysconfigdata module.
  19
  20 Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
  21 ---
  22  Lib/distutils/command/build_ext.py | 5 ++++-
  23  Lib/distutils/sysconfig.py         | 9 +++++++--
  24  2 files changed, 11 insertions(+), 3 deletions(-)
  25
  26 diff --git a/Lib/distutils/command/build_ext.py b/Lib/distutils/command/build_ext.py
  27 index 2c68be3..375b08c 100644
  28 --- a/Lib/distutils/command/build_ext.py
  29 +++ b/Lib/distutils/command/build_ext.py
  30 @@ -240,7 +240,10 @@ class build_ext (Command):
  31          if (sysconfig.get_config_var('Py_ENABLE_SHARED')):
  32              if not sysconfig.python_build:
  33                  # building third party extensions
  34 -                self.library_dirs.append(sysconfig.get_config_var('LIBDIR'))
  35 +                libdir = sysconfig.get_config_var('LIBDIR')
  36 +                if "_python_sysroot" in os.environ:
  37 +                    libdir = os.environ.get("_python_sysroot") + libdir
  38 +                self.library_dirs.append(libdir)
  39              else:
  40                  # building python standard extensions
  41                  self.library_dirs.append('.')
  42 diff --git a/Lib/distutils/sysconfig.py b/Lib/distutils/sysconfig.py
  43 index d72b6e5..72151df 100644
  44 --- a/Lib/distutils/sysconfig.py
  45 +++ b/Lib/distutils/sysconfig.py
  46 @@ -19,8 +19,13 @@ import sys
  47  from distutils.errors import DistutilsPlatformError
  48
  49  # These are needed in a couple of spots, so just compute them once.
  50 -PREFIX = os.path.normpath(sys.prefix)
  51 -EXEC_PREFIX = os.path.normpath(sys.exec_prefix)
  52 +if "_python_sysroot" in os.environ:
  53 +    _sysroot=os.environ.get('_python_sysroot')
  54 +    PREFIX = os.path.normpath(_sysroot + os.environ.get('_python_prefix'))
  55 +    EXEC_PREFIX = os.path.normpath(_sysroot + os.environ.get('_python_exec_prefix'))
  56 +else:
  57 +    PREFIX = os.path.normpath(sys.prefix)
  58 +    EXEC_PREFIX = os.path.normpath(sys.exec_prefix)
  59
  60  # Path to the base directory of the project. On Windows the binary may
  61  # live in project/PCBuild9.  If we're dealing with an x64 Windows build,
  62 --
  63 2.7.4
  64