warning: "nullptr" redefined when compile sdk\mozilla_chardet\src\nsSBCSGroupPro

[ollydbg]

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-------------- Build: sdk in Code::Blocks wx2.8.x (compiler: GNU GCC Compiler)---------------

[ 50.0%] g++.exe -Wall -g -pipe -mthreads -fmessage-length=0 -fexceptions -Winvalid-pch -DHAVE_W32API_H -D__WXMSW__ -DWXUSINGDLL -DcbDEBUG -DCB_PRECOMP -DWX_PRECOMP -DwxUSE_UNICODE -Woverloaded-virtual -DEXPORT_LIB -DEXPORT_EVENTS -DWXMAKINGDLL_SCI -iquote.objs\include -I.objs\include -I. -IE:\code\wx-mingw-build-481-dw2\wxWidgets-2.8.12\include -IE:\code\wx-mingw-build-481-dw2\wxWidgets-2.8.12\lib\gcc_dll\mswu -Isdk\wxscintilla\include -Isdk\wxpropgrid\include -Iinclude\tinyxml -Iinclude -Iinclude\tinyxml -Iinclude\scripting\bindings -Iinclude\scripting\include -Iinclude\scripting\sqplus -Iinclude\mozilla_chardet -Iinclude\mozilla_chardet\mfbt -Iinclude\mozilla_chardet\nsprpub\pr\include -Iinclude\mozilla_chardet\xpcom -Iinclude\mozilla_chardet\xpcom\base -Iinclude\mozilla_chardet\xpcom\glue -Isdk\wxpropgrid\include -c sdk\mozilla_chardet\src\nsSBCSGroupProber.cpp -o .objs\sdk\mozilla_chardet\src\nsSBCSGroupProber.o
In file included from include/sdk_events.h:12:0,
                 from include/manager.h:21,
                 from include/configmanager.h:17,
                 from sdk\mozilla_chardet\src\nsSBCSGroupProber.cpp:10:
include/prep.h:41:0: warning: "nullptr" redefined [enabled by default]
In file included from sdk\mozilla_chardet\src\nsSBCSGroupProber.cpp:8:0:
include\mozilla_chardet\mfbt/mozilla/NullPtr.h:40:0: note: this is the location of the previous definition



When look at this code in nsSBCSGroupProber.cpp

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#include <stdio.h>
#include "prmem.h"
#include "mozilla/NullPtr.h"

#include "configmanager.h"

#include "nsSBCharSetProber.h"
#include "nsSBCSGroupProber.h"

In mozilla/NullPtr.h, it has:

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#ifndef MOZ_HAVE_CXX11_NULLPTR
#  if defined(__GNUC__)
#    define nullptr __null   //******************** line 40
#  elif defined(_WIN64)
#    define nullptr 0LL
#  else
#    define nullptr 0L
#  endif
#endif


[MortenMacFly]

I wouldn't touch that now if not absolutely needed. I've an update for the Mozilla component after 13/12. hen we'll see if this is still an issue...

[ollydbg]

I wouldn't touch that now if not absolutely needed. I've an update for the Mozilla component after 13/12. hen we'll see if this is still an issue...

It's still an issue. (I build the latest svn head rev 9544, against wx30 C::B project, MinGW-Build GCC 4.7.3dw2)

Also, some other warnings like:

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[ 29.8%] g++.exe -Wall -g -pipe -mthreads -fmessage-length=0 -fexceptions -DHAVE_W32API_H -D__WXMSW__ -DWXUSINGDLL -DcbDEBUG -DNOPCH -DwxUSE_UNICODE -Woverloaded-virtual -DEXPORT_LIB -DEXPORT_EVENTS -DWXMAKINGDLL_SCI -IE:\code\wx\wxWidgets-3.0.0\include -IE:\code\wx\wxWidgets-3.0.0\lib\gcc_dll\mswu -Isdk\wxscintilla\include -Iinclude\tinyxml -Iinclude -Iinclude\tinyxml -Iinclude\scripting\bindings -Iinclude\scripting\include -Iinclude\scripting\sqplus -Iinclude\mozilla_chardet -Iinclude\mozilla_chardet\mfbt -Iinclude\mozilla_chardet\nsprpub\pr\include -Iinclude\mozilla_chardet\xpcom -Iinclude\mozilla_chardet\xpcom\base -Iinclude\mozilla_chardet\xpcom\glue -c sdk\editorbase.cpp -o .objs30\sdk\editorbase.o
In file included from include/cbauibook.h:10:0,
                from sdk\editorbase.cpp:26:
E:\code\wx\wxWidgets-3.0.0\include/wx/aui/auibook.h:349:18: warning: 'virtual bool wxAuiNotebook::AddPage(wxWindow*, const wxString&, bool, int)' was hidden [-Woverloaded-virtual]
In file included from sdk\editorbase.cpp:26:0:
include/cbauibook.h:132:14: warning:   by 'bool cbAuiNotebook::AddPage(wxWindow*, const wxString&, bool, const wxBitmap&)' [-Woverloaded-virtual]
In file included from include/cbauibook.h:10:0,
                from sdk\editorbase.cpp:26:
E:\code\wx\wxWidgets-3.0.0\include/wx/aui/auibook.h:352:18: warning: 'virtual bool wxAuiNotebook::InsertPage(size_t, wxWindow*, const wxString&, bool, int)' was hidden [-Woverloaded-virtual]
In file included from sdk\editorbase.cpp:26:0:
include/cbauibook.h:147:14: warning:   by 'bool cbAuiNotebook::InsertPage(size_t, wxWindow*, const wxString&, bool, const wxBitmap&)' [-Woverloaded-virtual]


[MortenMacFly]

OK, then we probably should sure that MOZ_HAVE_CXX11_NULLPTR is defined:

Either by locking what leads to the fact it is not and adjusting it
...or by simply defining it. :-)

Thats the relvant part:

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#elif defined(__GNUC__)
#  if defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L
#    if MOZ_GCC_VERSION_AT_LEAST(4, 6, 0)
#      define MOZ_HAVE_CXX11_NULLPTR
#    endif
#  endif
#elif defined(_MSC_VER) && _MSC_VER >= 1600


...one condition is false. The question is: Which one?

[stahta01]

This line is likely false under Windows cbp compiles.

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if defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L


Are we allowed to set a -std=gnu++11 to fix the problem under windows.
I ask because I read that we were NOT going to a higher C++ Standard under Linux.

Note: Using "-std=gnu++11" results in a even more annoying warning.

Tim S.

[oBFusCATed]

No, you're not allowed, yet.
Also -std=c++11 is the correct option.

[stahta01]

No, you're not allowed, yet.
Also -std=c++11 is the correct option.

IIRC, CB Will NOT compile (on windows using MinGW TDM) with -std=c++11 because that hides too many things like _popen last time I tried about 4 months ago.

Possible patch; but, I am coughing and sneezing too much to test it.

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Index: src/include/mozilla_chardet/mfbt/mozilla/NullPtr.h
===================================================================
--- src/include/mozilla_chardet/mfbt/mozilla/NullPtr.h (revision 9544)
+++ src/include/mozilla_chardet/mfbt/mozilla/NullPtr.h (working copy)
@@ -12,6 +12,9 @@
#ifndef mozilla_NullPtr_h
#define mozilla_NullPtr_h

+// C::B patch: to fix multiple defines of nullptr
+#include "prep.h"  // C::B Header that defines nullptr
+
#include "mozilla/Compiler.h"

#if defined(__clang__)
Index: src/include/prep.h
===================================================================
--- src/include/prep.h (revision 9544)
+++ src/include/prep.h (working copy)
@@ -39,6 +39,7 @@
        const nullptr_t& operator=(const nullptr_t&);
    } nullptr_;
    #define nullptr nullptr_
+    #define MOZ_HAVE_CXX11_NULLPTR  // prevents mozilla/NullPtr.h from defining nullptr.

    template<typename T> inline bool operator==(const nullptr_t& lhs, T const& rhs) { return  lhs.equals(rhs); }
    template<typename T> inline bool operator==(T const& lhs, const nullptr_t& rhs) { return  rhs.equals(lhs); }


Tim S.

[scarphin]

Tim: I can confirm your patch removes the warning.

[ollydbg]

I commit the patch to rev9589, thanks for all your contribution.