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[Bug c++/51299] New: [C++11] erroneous nullptr warning on dynamic cast
- From: "jarrydb at cse dot unsw.edu.au" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 25 Nov 2011 01:19:01 +0000
- Subject: [Bug c++/51299] New: [C++11] erroneous nullptr warning on dynamic cast
- Auto-submitted: auto-generated
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51299
Bug #: 51299
Summary: [C++11] erroneous nullptr warning on dynamic cast
Classification: Unclassified
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: jarrydb@cse.unsw.edu.au
The below code compiled with -Wzero-as-null-pointer-constant produces an
erroneous warning on a dynamic cast.
g++ -std=gnu++11 nullcast.cpp -c -Wzero-as-null-pointer-constant
nullcast.cpp: In function âvoid foo(Base*)â:
nullcast.cpp:13:40: warning: zero as null pointer constant
[-Wzero-as-null-pointer-constant]
nullcast.cpp:13:40: warning: zero as null pointer constant
[-Wzero-as-null-pointer-constant]
class Base
{
public:
virtual ~Base() = default;
};
class Derived : public Base
{
};
void foo(Base *b)
{
Derived *d = dynamic_cast<Derived*>(b);
}
gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/home/jarrydb/current/soft/install-latest/libexec/gcc/x86_64-unknown-linux-gnu/4.7.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: /home/jarrydb/current/soft/src/gcc-git/configure
--prefix=/home/jarrydb/current/soft/install-latest --disable-multilib
--enable-languages=c,c++
Thread model: posix
gcc version 4.7.0 20111125 (experimental) (GCC)