Patch #497126: Always compile dl.

Misc/ACKS

@@ -312,6 +312,7 @@ Fredrik Nehr
 Chad Netzer
 Max Neunhöffer
 George Neville-Neil
+Gustavo Niemeyer
 Oscar Nierstrasz
 Hrvoje Niksic
 Bill Noon

Misc/NEWS

@@ -12,6 +12,10 @@ Core and builtins
 
 Extension modules
 
+- dl is now build on every system that has dlfcn.h. Failure in case
+  of sizeof(int)!=sizeof(long)!=sizeof(void*) is delayed until dl.open
+  is called.
+
 Library
 
 - ftplib: to safeguard the user's privacy, anonymous login will use

Modules/dlmodule.c

@@ -158,6 +158,13 @@ dl_open(PyObject *self, PyObject *args)
 	char *name;
 	int mode;
 	PyUnivPtr *handle;
+	if (sizeof(int) != sizeof(long) ||
+	    sizeof(long) != sizeof(char *)) {
+		PyErr_SetString(PyExc_SystemError,
+ "module dl requires sizeof(int) == sizeof(long) == sizeof(char*)");
+		return NULL;
+	}
+
 	if (PyArg_Parse(args, "z", &name))
 		mode = RTLD_LAZY;
 	else {
@@ -204,13 +211,6 @@ initdl(void)
 {
 	PyObject *m, *d, *x;
 
-	if (sizeof(int) != sizeof(long) ||
-	    sizeof(long) != sizeof(char *)) {
-		PyErr_SetString(PyExc_SystemError,
- "module dl requires sizeof(int) == sizeof(long) == sizeof(char*)");
-		return;
-	}
-
 	/* Initialize object type */
 	Dltype.ob_type = &PyType_Type;
 

setup.py

@@ -567,6 +567,11 @@ class PyBuildExt(build_ext):
                                    define_macros = expat_defs,
                                    libraries = ['expat']) )
 
+	# Dynamic loading module
+        dl_inc = find_file('dlfcn.h', [], inc_dirs)
+        if dl_inc is not None:
+		exts.append( Extension('dl', ['dlmodule.c']) )
+		
         # Platform-specific libraries
         if platform == 'linux2':
             # Linux-specific modules