From 77547ba7b26aa65fc0f6dfcc0cb8235686699611 Mon Sep 17 00:00:00 2001
From: Pádraig Brady <P@draigBrady.com>
Date: Wed, 24 Jun 2015 19:14:47 +0100
Subject: maint: avoid undefined behavior in qsort call

GCC 5.1.1 -fsanitize=undefined with glibc 2.21 is returning:
"runtime error: null pointer passed as argument 1,
 which is declared to never be null"
* src/ptx.c (sort_found_occurs): Avoid the call with no entries.
---
 src/ptx.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

(limited to 'src/ptx.c')

diff --git a/src/ptx.c b/src/ptx.c
index ff4e63a5f..3aea4cdf2 100644
--- a/src/ptx.c
+++ b/src/ptx.c
@@ -631,9 +631,9 @@ sort_found_occurs (void)
 {
 
   /* Only one language for the time being.  */
-
-  qsort (occurs_table[0], number_of_occurs[0], sizeof **occurs_table,
-         compare_occurs);
+  if (number_of_occurs[0])
+    qsort (occurs_table[0], number_of_occurs[0], sizeof **occurs_table,
+           compare_occurs);
 }
 
 /* Parameter files reading routines.  */
-- 
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