It took me a while to find the reason and the solution to this, so i wish to be handy to those that still use xcode 3.

The fact:

I just created a New Project > Command Line Tool ( but this happen with probably any c++ project ) and 2 warnings suddenly show in Xcode 3.2.4:

and

This happen systematically after an Xcode upgrade on 10.6, it should actually be a bug fix, or better a workaround, that xcode folks performed on 10.5 and forgot to remove later. There could still be some issues using debug mode and STL by the way. If you need those flags in Debug Mode you can maybe fall back to GCC 4.0.

The solution:

To fix it in the actual project just remove those 2 key from project properties > build > search for them…

To permanently fix it in next project delete/comment the 2 corresponding lines in this file (right-click on C++Tool.xcodeproj > Show Package Content)

/Developer/Library/Xcode/Project Templates/Application/Command Line Tool/C++ Tool/C++Tool.xcodeproj/project.pbxproj

around at line 148:

/*"_GLIBCXX_DEBUG=1",
"_GLIBCXX_DEBUG_PEDANTIC=1",*/

This for default C++ projects, same procedure for different kind of c++ projects.

One of the missing default features i noticed in Xcode 3, coming from Eclipse ( classic or CDT ), is the automatic class template filling when using function “add C++ file”.
Programming in Object Oriented this save you lot a time and even silly errors.
What we want is to fill the files created when adding  new C++ File with Header like this:
Let’s say we want to create a new Neuron class:

Neuron.cpp

/*
*  Neuron.cpp
*  NeuralNetTest
*
*  Created by Lorenzo Tognalini on 26/07/11.
*  Copyright 2011 jalone.net. All rights reserved.
*
*/

#include "Neuron.h"

Neuron::Neuron(){

}

Neuron::~Neuron(){

}

Neuron.h

/*
*  Neuron.h
*  NeuralNetTest
*
*  Created by Lorenzo Tognalini on 26/07/11.
*  Copyright 2011 jalone.net. All rights reserved.
*
*/

#ifndef Neuron_H
#define Neuron_H

class Neuron{

public:
Neuron();
virtual    ~Neuron();
};

#endif //Neuron_H

To achieve this just follow this path

/Developer/Library/Xcode/File Templates/C and C++

and you’ll find two fails file.h and file.cpp
open them with any texteditor and edit their content using some provided tags ( pay attention to tag character ).
This is the way i edited them:

file.h

/*
*  «FILENAME»
*  «PROJECTNAME»
*
*  Created by «FULLUSERNAME» on «DATE».
*  Copyright «YEAR» «ORGANIZATIONNAME». All rights reserved.
*
*/

#ifndef «FILEBASENAMEASIDENTIFIER»_H
#define «FILEBASENAMEASIDENTIFIER»_H

class «FILEBASENAMEASIDENTIFIER»{

public:
«FILEBASENAMEASIDENTIFIER»();
virtual    ~«FILEBASENAMEASIDENTIFIER»();

};

#endif //«FILEBASENAMEASIDENTIFIER»_H

file.cpp

/*
*  «FILENAME»
*  «PROJECTNAME»
*
*  Created by «FULLUSERNAME» on «DATE».
*  Copyright «YEAR» «ORGANIZATIONNAME». All rights reserved.
*
*/

«OPTIONALHEADERINCLUDELINE»

«FILEBASENAMEASIDENTIFIER»::«FILEBASENAMEASIDENTIFIER»(){

}

«FILEBASENAMEASIDENTIFIER»::~«FILEBASENAMEASIDENTIFIER»(){

}

I’d like to make the include guard symbol uppercase and word underscore-separated, but i couldn’t find a way. So please let me know if you find more tags.

EDIT: files in previous path could not survive a developer tools change to solve this edit file following this link

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