1 Adjust library/header paths for cross-compilation
3 When cross-compiling third-party extensions, the get_python_inc() or
4 get_python_lib() can be called, to return the path to headers or
5 libraries. However, they use the sys.prefix of the host Python, which
6 returns incorrect paths when cross-compiling (paths pointing to host
7 headers and libraries).
9 In order to fix this, we introduce the _python_sysroot, _python_prefix
10 and _python_exec_prefix variables, that allow to override these
11 values, and get correct header/library paths when cross-compiling
12 third-party Python modules.
14 Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
16 Index: b/Lib/distutils/sysconfig.py
17 ===================================================================
18 --- a/Lib/distutils/sysconfig.py
19 +++ b/Lib/distutils/sysconfig.py
21 from .errors import DistutilsPlatformError
23 # These are needed in a couple of spots, so just compute them once.
24 -PREFIX = os.path.normpath(sys.prefix)
25 -EXEC_PREFIX = os.path.normpath(sys.exec_prefix)
26 -BASE_PREFIX = os.path.normpath(sys.base_prefix)
27 -BASE_EXEC_PREFIX = os.path.normpath(sys.base_exec_prefix)
28 +if "_python_sysroot" in os.environ:
29 + _sysroot=os.environ.get('_python_sysroot')
30 + PREFIX = os.path.normpath(_sysroot + os.environ.get('_python_prefix'))
31 + EXEC_PREFIX = os.path.normpath(_sysroot + os.environ.get('_python_exec_prefix'))
32 + BASE_PREFIX = PREFIX
33 + BASE_EXEC_PREFIX = EXEC_PREFIX
35 + PREFIX = os.path.normpath(sys.prefix)
36 + EXEC_PREFIX = os.path.normpath(sys.exec_prefix)
37 + BASE_PREFIX = os.path.normpath(sys.base_prefix)
38 + BASE_EXEC_PREFIX = os.path.normpath(sys.base_exec_prefix)
40 # Path to the base directory of the project. On Windows the binary may
41 # live in project/PCBuild9. If we're dealing with an x64 Windows build,
42 Index: b/Lib/distutils/command/build_ext.py
43 ===================================================================
44 --- a/Lib/distutils/command/build_ext.py
45 +++ b/Lib/distutils/command/build_ext.py
47 if (sysconfig.get_config_var('Py_ENABLE_SHARED')):
48 if not sysconfig.python_build:
49 # building third party extensions
50 - self.library_dirs.append(sysconfig.get_config_var('LIBDIR'))
51 + libdir = sysconfig.get_config_var('LIBDIR')
52 + if "_python_sysroot" in os.environ:
53 + libdir = os.environ.get("_python_sysroot") + libdir
54 + self.library_dirs.append(libdir)
56 # building python standard extensions
57 self.library_dirs.append('.')