--- a/mercurial/cext/osutil.c Tue Sep 17 14:57:42 2019 -0700
+++ b/mercurial/cext/osutil.c Tue Sep 17 15:09:25 2019 -0700
@@ -798,10 +798,17 @@
char *argvend;
extern void Py_GetArgcArgv(int *argc, char ***argv);
Py_GetArgcArgv(&argc, &argv);
+ /* Py_GetArgcArgv may not do much if a custom python
+ * launcher is used that doesn't record the information
+ * it needs. Let's handle this gracefully instead of
+ * segfaulting. */
+ if (argv != NULL)
+ argvend = argvstart = argv[0];
+ else
+ argvend = argvstart = NULL;
/* Check the memory we can use. Typically, argv[i] and
* argv[i + 1] are continuous. */
- argvend = argvstart = argv[0];
for (i = 0; i < argc; ++i) {
if (argv[i] > argvend || argv[i] < argvstart)
break; /* not continuous */