buildroot

distutils: fix build_ext check to find whether we're building Python or not

​

The build_ext logic uses

sys.executable.startswith(os.path.join(sys.exec_prefix, "bin")) to

determine whether we're building a third-party Python extension, or a

built-in Python extension. However, this check is wrong in

cross-compilation mode, and instead, the sysconfig.python_build

variable should be used.

​

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

Index: b/Lib/distutils/command/build_ext.py

===================================================================

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

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

@@ -235,7 +235,7 @@

         # Python's library directory must be appended to library_dirs

         # See Issues: #1600860, #4366

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

-            if sys.executable.startswith(os.path.join(sys.exec_prefix, "bin")):

+            if not sysconfig.python_build:

                 # building third party extensions

                 self.library_dirs.append(sysconfig.get_config_var('LIBDIR'))

             else: