Issue #11450: Don't truncate hg version info in Py_GetBuildInfo() when

there are many tags (e.g. when using mq).  Patch by Nadeem Vawda.

Misc/NEWS

@@ -10,6 +10,9 @@ What's New in Python 3.1.4?
 Core and Builtins
 -----------------
 
+- Issue #11450: Don't truncate hg version info in Py_GetBuildInfo() when
+  there are many tags (e.g. when using mq).  Patch by Nadeem Vawda.
+
 - Issue #10451: memoryview objects could allow to mutate a readable buffer.
   Initial patch by Ross Lagerwall.
 

Modules/getbuildinfo.c

@@ -42,7 +42,9 @@
 const char *
 Py_GetBuildInfo(void)
 {
-    static char buildinfo[50];
+    static char buildinfo[50 + sizeof HGVERSION +
+                          ((sizeof HGTAG > sizeof HGBRANCH) ?
+                           sizeof HGTAG : sizeof HGBRANCH)];
     const char *revision = _Py_hgversion();
     const char *sep = *revision ? ":" : "";
     const char *hgid = _Py_hgidentifier();