[SOLVED]Make QtCreator, QMake and clang3.2 work with c++11

stereomatching

Never success in the first time when related to environment setting
They always pop out a lot of problems.

my .pro file
@
#-------------------------------------------------

Project created by QtCreator 2013-02-06T07:23:32

#-------------------------------------------------

QT += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = test00
TEMPLATE = app

CONFIG += -std=gnu++11

SOURCES += main.cpp
mainwindow.cpp

HEADERS += mainwindow.h

FORMS += mainwindow.ui

@

The source codes
@
#include <functional>
#include <iostream>
#include <memory>

#include "mainwindow.h"
#include <QApplication>

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();

auto A = 444; //generate warning, 
std::cout<<A<<std::endl;
std::unique_ptr<int> B; //generate error messages

return a.exec(&#41;;

}

@

warning : auto' type specifier is a C++11 extension [-Wc++11-extensions]

error messages :
error: expected '(' for function-style cast or type construction
std::unique_ptr<int> B

ogoffart

in your qmake .pro file, add

Qt5:
@CONFIG += c++11@

or Qt4:
@CXXFLAGS += -std=c++11@

See also http://woboq.com/blog/cpp11-in-qt5.html

stereomatching

I tried it, both
CXXFLAGS += -std=c++11
CONFIG += -std=c++11
or
CONFIG += -std=gnu++11

I also execute the clang++ directly

clang++ -stdlib=libstdc++ -std=c++11 main.cpp

@
//
// main.cpp
// yyyy
//
// Created by yyyy on 2/6/13.
// Copyright (c) 2013 yyyy. All rights reserved.
//

#include <functional>
#include <iostream>
#include <memory>
#include <string>
#include <vector>

int main(int argc, const char * argv[])
{

// insert code here...
std::cout << "Hello, World!\n";
std::unique_ptr<int> A(new int(3)); //generate errors on this line

//but this is fine
auto func = { std::cout << "hahaha\n"; };
func();

return 0;

}
@

error messages

main.cpp:20:10: error: no member named 'unique_ptr' in namespace 'std'
std::unique_ptr<int> A(new int(3));
~~~~~^
main.cpp:20:24: error: expected '(' for function-style cast or type construction
std::unique_ptr<int> A(new int(3));
~~~^
main.cpp:20:26: error: use of undeclared identifier 'A'
std::unique_ptr<int> A(new int(3));

ogoffart

What is the compiler command?

Also, unique_ptr is part of the standard library. Are you using the stdlib from gcc or the libcpp?
If you are using the one from gcc, you need to have a recent version of GCC.

If you are on mac, it is better to use libcpp, then you need to use -stdlib=libc++
But I think is not binary compatible with GCC's library.

stereomatching

bq. What is the compiler command?

clang++ -stdlib=libstdc++ -std=c++11 main.cpp -o test

Now I get rid of those errors by using the default compiler on OS X 10.8.1
I downloaded the command line tools by XCODE

but when I compile it by QtCreator
It can't work

.pro
@
TEMPLATE = app
CONFIG += console
CONFIG -= app_bundle
CONFIG -= qt
CONFIG += -std=c++11

SOURCES += main.cpp

@

@
#include <iostream>

using namespace std;

int main()
{
cout << "Hello World2!" << endl;

auto func = [](){cout << "wahaha"<<endl; };

return 0;

}
@

the compiler of the QtCreator refer to is usr/bin/clang++

I don't know this is the same compiler of the command line refer to or not?
How could I check the path of the "clang++" of the terminal refer to?

alexisdm

[quote author="stereomatching" date="1360195754"]How could I check the path of the "clang++" of the terminal refer to?[/quote]
Try typing that in the terminal:
@which clang++@

stereomatching

[quote author="alexisdm" date="1360197491"][quote author="stereomatching" date="1360195754"]How could I check the path of the "clang++" of the terminal refer to?[/quote]
Try typing that in the terminal:
@which clang++@

[/quote]
Thanks, it is same as the QtCreator refer to
/usr/bin/clang++

So the problem is how could I make that QtCreator
know I need c++11 support just like the command line do?

command input from the terminal
clang++ -stdlib=libstdc++ -std=c++11

the codes with c++11 library also pass if it is compile by command line
@
//
// main.cpp
// yyyy
//
// Created by yyyy on 2/6/13.
// Copyright (c) 2013 yyyy. All rights reserved.
//

#include <functional>
#include <iostream>
#include <memory>
#include <string>
#include <vector>

template<typename T>
void print_comma_separated_list(T value)
{
std::cout<<value<<std::endl;
}

template<typename First,typename ... Rest>
void print_comma_separated_list(First first,Rest ... rest)
{
std::cout<<first<<",";
print_comma_separated_list(rest...);
}

int main(int argc, const char * argv[])
{

// insert code here...
std::cout << "Hello, World!\n";

auto func = [](){ std::cout << "hahaha\n"; };
func();

std::vector<std::string> strs{"yahoo", "haha"};
for(auto const &data : strs){
    std::cout<<data<<std::endl;
}

std::vector<std::string> strs2 = std::move(strs);
for(auto const &data : strs2){
    std::cout<<data<<std::endl;
}

std::unique_ptr<int> A(new int(3));
std::cout<<*A<<std::endl;

print_comma_separated_list(32, "444", 34.564564, "lalamimilolipo");

return 0;

}
@

alexisdm

You should add:
@QMAKE_CXXFLAGS += -std=c++11@

The previously given variable, CXXFLAGS, doesn't do anything.

stereomatching

Thanks, QMAKE_CXXFLAGS += -std=c++11 did make c++11 features pass

@
TEMPLATE = app
CONFIG += console
CONFIG -= app_bundle
CONFIG -= qt

SOURCES += main.cpp

QMAKE_CXXFLAGS += -std=c++11
@

But it can't compile when I use something related to the library
like unique_ptr or initialise_list

Under command line, stdlib=libstdc++ should play the trick
How about QtCreator?Even it pass, could it work with Qt?

alexisdm

You can add "-stdlib=libstdc++" to QMAKE_CXXFLAGS too.

stereomatching

bq. You can add “-stdlib=libstdc++” to QMAKE_CXXFLAGS too.

I tried it, but can't work

@
TEMPLATE = app
CONFIG += console
CONFIG -= app_bundle
CONFIG -= qt

SOURCES += main.cpp

QMAKE_CXXFLAGS += -std=c++11
QMAKE_CXXFLAGS += -stdlib=libstdc++
@

part of the error messages
@
In file included from /usr/include/c++/4.2.1/ostream:44:
In file included from /usr/include/c++/4.2.1/ios:47:
In file included from /usr/include/c++/4.2.1/bits/ios_base.h:46:
In file included from /usr/include/c++/4.2.1/bits/locale_classes.h:46:
In file included from /usr/include/c++/4.2.1/string:47:
In file included from /usr/include/c++/4.2.1/memory:54:
@

compiler do not connect to libstdc++?

stereomatching

combinations of the .pro file

@
TEMPLATE = app
CONFIG += console
CONFIG -= app_bundle
CONFIG -= qt

SOURCES += main.cpp

QMAKE_CXXFLAGS += -std=c++11
QMAKE_CXXFLAGS += -stdlib=libstdc++
@

@
TEMPLATE = app
CONFIG += console
CONFIG -= app_bundle
CONFIG -= qt
CONFIG += -stdlib=libstdc++

SOURCES += main.cpp

QMAKE_CXXFLAGS += -std=c++11
QMAKE_CXXFLAGS += -stdlib=libstdc++
@

@
TEMPLATE = app
CONFIG += console
CONFIG -= app_bundle
CONFIG -= qt
CONFIG += -stdlib=libstdc++

SOURCES += main.cpp

QMAKE_CXXFLAGS += -std=c++11
#QMAKE_CXXFLAGS += -stdlib=libstdc++
@

All of them can't work

stereomatching

The make file generated by this .pro

@
TEMPLATE = app
CONFIG += console
CONFIG -= app_bundle
CONFIG -= qt

SOURCES += main.cpp

QMAKE_CXXFLAGS += -std=c++11
QMAKE_CXXFLAGS += -stdlib=libstdc++
@

"makefile":http://pastebin.com/2E6xMRL6

The flags -stdlib=libstdc++ and -std=c++11
are added into the Compiler, tools and options part
CXXFLAGS = -pipe -std=c++11 -stdlib=libstdc++ -O2 -arch x86_64 -Wall -W $(DEFINES)

what is the problem of the makefile generated by qmake?

stereomatching

Sorry, I did a mistake, the command should be
-stdlib=libc++ but not -stdlib=libstdc++

The correct command line :
clang++ -stdlib=libc++ -std=c++11 main.cpp -o test

command line work fine, but QtCreator still generate error message

QtCreator setting :
"setting":http://www.flickr.com/photos/92283971@N04/8453188038/in/photostream

.pro file after change

@TEMPLATE = app
CONFIG += console
CONFIG -= app_bundle
CONFIG -= qt
CONFIG += -stdlib=libc++

SOURCES += main.cpp

QMAKE_CXXFLAGS += -std=c++11
QMAKE_CXXFLAGS += -stdlib=libc++@

error message

clang: error: invalid deployment target for -stdlib=libc++ (requires OS X 10.7 or later)
make: *** [main.o] Error 1

But my OS number is 10.8.1

alexisdm

The version is taken from the "QMAKE_MACOSX_DEPLOYMENT_TARGET":http://qt-project.org/doc/qt-4.8/qmake-variable-reference.html#qmake-macosx-deployment-target variable, so if it wouldn't work with that version, you get an error.

stereomatching

@
TEMPLATE = app
CONFIG += console
CONFIG -= app_bundle
CONFIG -= qt
CONFIG += -stdlib=libc++

SOURCES += main.cpp

#QMAKE_LFLAGS += -nodefaultlibs /usr/lib/libstdc++.dylib /usr/lib/libgcc_s.1.dylib

QMAKE_CXXFLAGS += -stdlib=libc++
QMAKE_CXXFLAGS += -std=c++11
QMAKE_MACOSX_DEPLOYMENT_TARGET = 10.7
#QMAKE_CXXFLAGS += -mmacosx-version-min=10.7 #this line also give the same error message
@

error message
clang: error: linker command failed with exit code 1 (use -v to see invocation)

alexisdm

Try this: http://qt-project.org/forums/viewthread/17150

stereomatching

[quote author="alexisdm" date="1360245040"]Try this: http://qt-project.org/forums/viewthread/17150[/quote]

According to the informations of the link, I add
QMAKE_MACOSX_DEPLOYMENT_TARGET = 10.7
just as the previous post

But I get another error message
clang: error: linker command failed with exit code 1 (use -v to see invocation)

The contents of the makefile
"makefile":http://pastebin.com/CaiFdNtF

Apparently, it do not link to the proper library
Where is the proper library?

alexisdm

According to the generated makefile, the target is still 10.4.
Can you show the compilation output to see how clang++ is invoked ?

If you have to add -stdlib=libc++, that means the current Qt installation uses libstdc++, and you won't be able to compile anything with both Qt and libc++, unless you recompile Qt.

stereomatching

Sorry, looks like I posted a wrong makefile
This time I'm sure the target is 10.7
"makefile":http://pastebin.com/SqG8hyPZ

.pro
@
TEMPLATE = app
CONFIG += console
CONFIG -= app_bundle
CONFIG -= qt
#CONFIG += -stdlib=libc++

SOURCES += main.cpp

#QMAKE_LFLAGS += -nodefaultlibs /usr/lib/libstdc++.dylib /usr/lib/libgcc_s.1.dylib

QMAKE_CXXFLAGS += -stdlib=libc++
QMAKE_CXXFLAGS += -std=c++11
#QMAKE_CXXFLAGS += -mmacosx-version-min=10.7
QMAKE_MACOSX_DEPLOYMENT_TARGET = 10.7

#LIBS += /usr/lib/libstdc++.dylib /usr/lib/libgcc_s.1.dylib

@

"error messages":http://pastebin.com/0RahN86i

bq. If you have to add -stdlib=libc++, that means the current Qt installation uses libstdc++, and you won’t be able to compile anything with both Qt and libc++, unless you recompile Qt.

How about Qt5?Do I need to add -stdlib=libc++ if it is Qt5?
I would upgrade my projects to Qt5 if I could skip the pain of recompile

Whatever, now the problem is how to make QtCreator could work with clang++
and c++11.Command line can make the job done but the makefile generated
by qmake can't compile.