[2.7] bpo-32647: Link ctypes extension with libdl. (pythonGH-5550) (python#5877)

tiran · web-flow · commit 4bb9b9aea04b · 2018-02-25T12:31:17.000+01:00
The ctypes module used to depend on indirect linking for dlopen. The shared extension is now explicitly linked against libdl on platforms with dl. Signed-off-by: Christian Heimes <christian@python.org>. (cherry picked from commit 5bb9692) Co-authored-by: Christian Heimes <christian@python.org>
diff --git a/Misc/NEWS.d/next/Library/2018-02-05-13-31-42.bpo-32647.ktmfR_.rst b/Misc/NEWS.d/next/Library/2018-02-05-13-31-42.bpo-32647.ktmfR_.rst
@@ -0,0 +1,2 @@
+The ctypes module used to depend on indirect linking for dlopen. The shared
+extension is now explicitly linked against libdl on platforms with dl.
diff --git a/setup.py b/setup.py
@@ -2149,6 +2149,10 @@ def detect_ctypes(self, inc_dirs, lib_dirs):
             ext.libraries.append(ffi_lib)
             self.use_system_libffi = True
 
+        if sysconfig.get_config_var('HAVE_LIBDL'):
+            # for dlopen, see bpo-32647
+            ext.libraries.append('dl')
+
     def _detect_nis(self, inc_dirs, lib_dirs):
         if host_platform in {'win32', 'cygwin', 'qnx6'}:
             return None

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	`+The ctypes module used to depend on indirect linking for dlopen. The shared`
	`2`	`+extension is now explicitly linked against libdl on platforms with dl.`