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re PR c++/52119 ([C++11] overflow in signed left shift isn't diagnosed) 

2012-02-05  Jeffrey Yasskin  <jyasskin@gcc.gnu.org>
	    Paolo Carlini  <paolo.carlini@oracle.com>

	PR libstdc++/52119
	* include/std/limits (__glibcxx_min): Fix to avoid undefined behavior.

From-SVN: r183905
This commit is contained in:
Jeffrey Yasskin 2012-02-05 12:58:51 +00:00 committed by Paolo Carlini
parent b1c02fdc55
commit cee8c7a274
2 changed files with 9 additions and 3 deletions
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8
libstdc++-v3/ChangeLog
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@ -1,3 +1,9 @@
2012-02-05 Jeffrey Yasskin <jyasskin@gcc.gnu.org>
Paolo Carlini <paolo.carlini@oracle.com>
PR libstdc++/52119
* include/std/limits (__glibcxx_min): Fix to avoid undefined behavior.
2012-02-03 Benjamin Kosnik <bkoz@redhat.com>
PR libstdc++/49445
@ -97,7 +103,7 @@
PR libstdc++/51795
* include/bits/random.h (linear_congruential_generator): Add
static_assert preventing instantiation for values of 'a' and 'm'
currently handled incorrectly but _Mod::__calc.
currently handled incorrectly by _Mod::__calc.
* include/bits/random.tcc (seed_seq::generate): Avoid unsafe
uses of _Mod::__calc.

4
libstdc++-v3/include/std/limits
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@ -1,7 +1,7 @@
// The template and inlines for the numeric_limits classes. -*- C++ -*-
// Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
// 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
// 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
@ -129,7 +129,7 @@
#define __glibcxx_signed(T) ((T)(-1) < 0)
#define __glibcxx_min(T) \
(__glibcxx_signed (T) ? (T)1 << __glibcxx_digits (T) : (T)0)
(__glibcxx_signed (T) ? -__glibcxx_max (T) - 1 : (T)0)
#define __glibcxx_max(T) \
(__glibcxx_signed (T) ? \