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- 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.
- The _python_sysroot variable is also used to prefix the LIBDIR value
- taken from the sysconfigdata module.
- Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
- Index: b/Lib/distutils/sysconfig.py
- ===================================================================
- --- a/Lib/distutils/sysconfig.py
- +++ b/Lib/distutils/sysconfig.py
- @@ -19,8 +19,13 @@
- from distutils.errors import DistutilsPlatformError
-
- # 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)
- +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'))
- +else:
- + PREFIX = os.path.normpath(sys.prefix)
- + EXEC_PREFIX = os.path.normpath(sys.exec_prefix)
-
- # Path to the base directory of the project. On Windows the binary may
- # live in project/PCBuild9. If we're dealing with an x64 Windows build,
- Index: b/Lib/distutils/command/build_ext.py
- ===================================================================
- --- a/Lib/distutils/command/build_ext.py
- +++ b/Lib/distutils/command/build_ext.py
- @@ -237,7 +237,10 @@
- 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('.')
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