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008-distutils-use-python-sysroot.patch

008-distutils-use-python-sysroot.patch 2.2 KB
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  1. Adjust library/header paths for cross-compilation
    2. 

  2. 

  3. When cross-compiling third-party extensions, the get_python_inc() or
    4. 

  4. get_python_lib() can be called, to return the path to headers or
    5. 

  5. libraries. However, they use the sys.prefix of the host Python, which
    6. 

  6. returns incorrect paths when cross-compiling (paths pointing to host
    7. 

  7. headers and libraries).
    8. 

  8. 

  9. In order to fix this, we introduce the _python_sysroot, _python_prefix
    10. 

  10. and _python_exec_prefix variables, that allow to override these
    11. 

  11. values, and get correct header/library paths when cross-compiling
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  12. third-party Python modules.
    13. 

  13. 

  14. The _python_sysroot variable is also used to prefix the LIBDIR value
    15. 

  15. taken from the sysconfigdata module.
    16. 

  16. 

  17. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
    18. 

  18. 

  19. --- a/Lib/distutils/sysconfig.py
    20. 

  20. +++ b/Lib/distutils/sysconfig.py
    21. 

  21. @@ -19,8 +19,13 @@ import sys
    22. 

  22.  from distutils.errors import DistutilsPlatformError
    23. 

  23.  
    24. 

  24.  # These are needed in a couple of spots, so just compute them once.
    25. 

  25. -PREFIX = os.path.normpath(sys.prefix)
    26. 

  26. -EXEC_PREFIX = os.path.normpath(sys.exec_prefix)
    27. 

  27. +if "_python_sysroot" in os.environ:
    28. 

  28. +    _sysroot=os.environ.get('_python_sysroot')
    29. 

  29. +    PREFIX = os.path.normpath(_sysroot + os.environ.get('_python_prefix'))
    30. 

  30. +    EXEC_PREFIX = os.path.normpath(_sysroot + os.environ.get('_python_exec_prefix'))
    31. 

  31. +else:
    32. 

  32. +    PREFIX = os.path.normpath(sys.prefix)
    33. 

  33. +    EXEC_PREFIX = os.path.normpath(sys.exec_prefix)
    34. 

  34.  
    35. 

  35.  # Path to the base directory of the project. On Windows the binary may
    36. 

  36.  # live in project/PCBuild9.  If we're dealing with an x64 Windows build,
    37. 

  37. --- a/Lib/distutils/command/build_ext.py
    38. 

  38. +++ b/Lib/distutils/command/build_ext.py
    39. 

  39. @@ -240,7 +240,10 @@ class build_ext (Command):
    40. 

  40.          if (sysconfig.get_config_var('Py_ENABLE_SHARED')):
    41. 

  41.              if not sysconfig.python_build:
    42. 

  42.                  # building third party extensions
    43. 

  43. -                self.library_dirs.append(sysconfig.get_config_var('LIBDIR'))
    44. 

  44. +                libdir = sysconfig.get_config_var('LIBDIR')
    45. 

  45. +                if "_python_sysroot" in os.environ:
    46. 

  46. +                    libdir = os.environ.get("_python_sysroot") + libdir
    47. 

  47. +                self.library_dirs.append(libdir)
    48. 

  48.              else:
    49. 

  49.                  # building python standard extensions
    50. 

  50.                  self.library_dirs.append('.')
    51.