[PATCH 2 of 2 V4] setup: detect Python DLL filename from loaded DLL

Gregory Szorc gregory.szorc at gmail.com
Thu Apr 28 11:54:36 EDT 2016


# HG changeset patch
# User Gregory Szorc <gregory.szorc at gmail.com>
# Date 1461858733 25200
#      Thu Apr 28 08:52:13 2016 -0700
# Branch stable
# Node ID 584df30ed33ce82566237b4d47a17a9c3023a6c7
# Parent  5b7f85ccc5851871997f0383331f2982c6db1f43
setup: detect Python DLL filename from loaded DLL

Attempting to build Mercurial from source using MinGW from
msys2 on Windows produces a hg.exe that attempts to load e.g.
python27.dll. MinGW prefixes its library name with "lib" and
adds a period between the major and minor versions. e.g.
"libpython2.7.dll."

Before this patch, hg.exe files in a MinGW environment would
either fail to find a Python DLL or would attempt to load a
non-MinGW DLL, which would summarily explode. Either way,
hg.exe wouldn't work.

This patch improves the code that determines the Python DLL
filename to actually use the loaded Python DLL instead of
inferring it. Basically we take the handle of the loaded DLL
from sys.dllhandle and call a Windows API to try to resolve
that handle to a filename.

diff --git a/setup.py b/setup.py
--- a/setup.py
+++ b/setup.py
@@ -52,16 +52,17 @@ else:
         import bz2
         bz2.BZ2Compressor # silence unused import warning
     except ImportError:
         raise SystemExit(
             "Couldn't import standard bz2 (incomplete Python install).")
 
 ispypy = "PyPy" in sys.version
 
+import ctypes
 import os, stat, subprocess, time
 import re
 import shutil
 import tempfile
 from distutils import log
 if 'FORCE_SETUPTOOLS' in os.environ:
     from setuptools import setup
 else:
@@ -364,18 +365,44 @@ class buildhgexe(build_ext):
     description = 'compile hg.exe from mercurial/exewrapper.c'
 
     def build_extensions(self):
         if os.name != 'nt':
             return
         if isinstance(self.compiler, HackedMingw32CCompiler):
             self.compiler.compiler_so = self.compiler.compiler # no -mdll
             self.compiler.dll_libraries = [] # no -lmsrvc90
-        hv = sys.hexversion
-        pythonlib = 'python%d%d' % (hv >> 24, (hv >> 16) & 0xff)
+
+        # Different Python installs can have different Python library
+        # names. e.g. the official CPython distribution uses pythonXY.dll
+        # and MinGW uses libpythonX.Y.dll.
+        _kernel32 = ctypes.windll.kernel32
+        _kernel32.GetModuleFileNameA.argtypes = [ctypes.c_void_p,
+                                                 ctypes.c_void_p,
+                                                 ctypes.c_ulong]
+        _kernel32.GetModuleFileNameA.restype = ctypes.c_ulong
+        size = 1000
+        buf = ctypes.create_string_buffer(size + 1)
+        filelen = _kernel32.GetModuleFileNameA(sys.dllhandle, ctypes.byref(buf),
+                                               size)
+
+        if filelen > 0 and filelen != size:
+            dllbasename = os.path.basename(buf.value)
+            if not dllbasename.lower().endswith('.dll'):
+                raise SystemExit('Python DLL does not end with .dll: %s' %
+                                 dllbasename)
+            pythonlib = dllbasename[:-4]
+        else:
+            log.warn('could not determine Python DLL filename; '
+                     'assuming pythonXY')
+
+            hv = sys.hexversion
+            pythonlib = 'python%d%d' % (hv >> 24, (hv >> 16) & 0xff)
+
+        log.info('using %s as Python library name' % pythonlib)
         with open('mercurial/hgpythonlib.h', 'wb') as f:
             f.write('/* this file is autogenerated by setup.py */\n')
             f.write('#define HGPYTHONLIB "%s"\n' % pythonlib)
         objects = self.compiler.compile(['mercurial/exewrapper.c'],
                                          output_dir=self.build_temp)
         dir = os.path.dirname(self.get_ext_fullpath('dummy'))
         target = os.path.join(dir, 'hg')
         self.compiler.link_executable(objects, target,


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