From 3545635a606206232da80a4c18862fa3e06b9e4f Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Fri, 29 Oct 2010 17:20:42 +0000
Subject: Check if ErrMsg is null. This fixes the "not" command.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117666 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/System/Unix/Program.inc | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

(limited to 'lib/System')

diff --git a/lib/System/Unix/Program.inc b/lib/System/Unix/Program.inc
index b92d080bab..86d9b2a1d9 100644
--- a/lib/System/Unix/Program.inc
+++ b/lib/System/Unix/Program.inc
@@ -359,24 +359,29 @@ Program::Wait(const sys::Path &path,
       result = 126;
 #endif
     if (result == 127) {
-      *ErrMsg = llvm::sys::StrError(ENOENT);
+      if (ErrMsg)
+        *ErrMsg = llvm::sys::StrError(ENOENT);
       return -1;
     }
     if (result == 126) {
-      *ErrMsg = "Program could not be executed";
+      if (ErrMsg)
+        *ErrMsg = "Program could not be executed";
       return -1;
     }
   } else if (WIFSIGNALED(status)) {
-    *ErrMsg = strsignal(WTERMSIG(status));
+    if (ErrMsg) {
+      *ErrMsg = strsignal(WTERMSIG(status));
 #ifdef WCOREDUMP
-    if (WCOREDUMP(status))
-      *ErrMsg += " (core dumped)";
+      if (WCOREDUMP(status))
+        *ErrMsg += " (core dumped)";
 #endif
+    }
     return -1;
   }
   return result;
 #else
-  *ErrMsg = "Program::Wait is not implemented on this platform yet!";
+  if (ErrMsg)
+    *ErrMsg = "Program::Wait is not implemented on this platform yet!";
   return -1;
 #endif
 }
-- 
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