From bf8ce85a42258d0fd7c7d20362af55c243045e45 Mon Sep 17 00:00:00 2001
From: Martin Sebor <msebor@redhat.com>
Date: Wed, 6 Dec 2017 19:22:55 +0000
Subject: [PATCH] PR testsuite/83303 - FAIL: g++.dg/opt/new1.C on arm-none-eabi

PR testsuite/83303 - FAIL: g++.dg/opt/new1.C on arm-none-eabi
(extra -Walloc-size-larger-than warning

	* g++.dg/opt/new1.C: Prune warning from test output.

From-SVN: r255450
---
 gcc/testsuite/ChangeLog         | 3 +++
 gcc/testsuite/g++.dg/opt/new1.C | 9 ++++++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 782e04d3639..3ad19f056ec 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -9,6 +9,9 @@
 
 2017-12-06  Martin Sebor  <msebor@redhat.com>
 
+	PR testsuite/83303
+	* g++.dg/opt/new1.C: Prune warning from test output.
+
 	PR tree-optimization/82646
 	* gcc.dg/builtin-stringop-chk-1.c: Adjust.
 	* gcc.dg/builtin-stringop-chk-9.c: New test.
diff --git a/gcc/testsuite/g++.dg/opt/new1.C b/gcc/testsuite/g++.dg/opt/new1.C
index d0f7d95b655..22bd5c3920a 100644
--- a/gcc/testsuite/g++.dg/opt/new1.C
+++ b/gcc/testsuite/g++.dg/opt/new1.C
@@ -1,4 +1,4 @@
-// PR c++/39367
+// PR c++/39367 - ICE at tree-inline.c:1042 with -O
 // { dg-options "-O" }
 
 class QScriptEnginePrivate;
@@ -37,6 +37,11 @@ template <typename T> void QScript::Buffer<T>::resize(int s) {
       reserve (s << 1);
 }
 template <typename T> void QScript::Buffer<T>::reserve(int x) {
+    /* The following may be optimized into a trap because the function
+       is called from resize(0) and so with m_capacity < 0.  When not
+       optimized it may trigger -Walloc-size-larger-than= since
+       operator new() is called with an excessively large value.
+       The warning is pruned from the test output below.  */
     T *new_data = new T[m_capacity];
     for (int i=0; i<m_size; ++i)
       new_data[i] = m_data[i];
@@ -69,3 +74,5 @@ namespace QScript {
           }
     }
 }
+
+// { dg-prune-output "\\\[-Walloc-size-larger-than=]" }
-- 
2.30.2