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From: "mw_triad at users dot sourceforge.net" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/52718] -Wzero-as-null-pointer-constant: misleading location for 0 as default argument
Date: Thu, 01 Nov 2012 17:47:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D52718

--- Comment #12 from Matthew Woehlke <mw_triad at users dot sourceforge.net=
> 2012-11-01 17:47:04 UTC ---
Requires qt-devel installed, but has the benefit of being the exact issue I=
'm
having in production (on the chance it's something screwy about Qt...):


$ cat zero-as-pointer.cpp=20
#include <QtGui/QLabel>

int main()
{
  QLabel label;
  return 0;
}
$ g++ -std=3Dc++11 -Werror=3Dzero-as-null-pointer-constant zero-as-pointer.=
cpp=20
zero-as-pointer.cpp: In function =E2=80=98int main()=E2=80=99:
zero-as-pointer.cpp:5:10: error: zero as null pointer constant
[-Werror=3Dzero-as-null-pointer-constant]
cc1plus: some warnings being treated as errors
Exit 1
$ g++ --version
g++ (GCC) 4.7.2 20120921 (Red Hat 4.7.2-2)
Copyright (C) 2012 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

...maybe it got fixed in 4.7.3?


Note: the problem is this ctor:

explicit QLabel(QWidget *parent=3D0, Qt::WindowFlags f=3D0);

If I replace my declaration with:

QLabel label(nullptr, Qt::WindowFlags(nullptr));

...then I get no warning.