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

ogoffart · wrote on 6 Feb 2013, 22:56

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 · wrote on 7 Feb 2013, 00:09

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 · wrote on 7 Feb 2013, 00:38

[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 · wrote on 7 Feb 2013, 00:42

[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 · wrote on 7 Feb 2013, 00:47

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

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

stereomatching · wrote on 7 Feb 2013, 00:59

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 · wrote on 7 Feb 2013, 01:50

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

stereomatching · wrote on 7 Feb 2013, 02:24

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 · wrote on 7 Feb 2013, 02:50

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 · wrote on 7 Feb 2013, 05:14

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 · wrote on 7 Feb 2013, 10:17

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 · wrote on 7 Feb 2013, 12:27

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 · wrote on 7 Feb 2013, 13:19

@
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 · wrote on 7 Feb 2013, 13:50

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

stereomatching · wrote on 7 Feb 2013, 14:35

[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 · wrote on 7 Feb 2013, 15:38

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 · wrote on 8 Feb 2013, 04:10

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.

stereomatching · wrote on 8 Feb 2013, 04:33

I give Qt5.0.1 a try, it has a same problem too
But this is expectable since the codes have nothing
to do with Qt but QtCreator and clang++.

I install Qt5.0.1 and Qt4.8.4 on mac together
Not sure this could be a problem or not

.pro of Qt5
@
TEMPLATE = app
CONFIG += console
CONFIG -= app_bundle
CONFIG -= qt
CONFIG += c++11
#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
@

"makefile":http://pastebin.com/76PUzw2u

"error messages":http://pastebin.com/WTWrwm8d

stereomatching · wrote on 8 Feb 2013, 05:14

I am thinking of using gcc4.7 to replace clang3.2
Compile with gcc come from the osx is fine with Qt4.8.4

But Qt5.0.1 would generate a warning message no matter it is
clang or gcc

ld: warning: directory not found for option '-F/Users/yyyy/Qt5.0.1/5.0.1/clang_64/qtbase/lib'

stereomatching · wrote on 8 Feb 2013, 08:32

I download gcc4.8 by macport

//install gcc48
sudo port install gcc48

//set gcc48 as the default compiler
sudo port select --set gcc mp-gcc48

set the compiler under /opt/local/bin/g++ for Qt5.0.1

.pro file

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

SOURCES += main.cpp

QMAKE_CXXFLAGS += -std=c++0x
@

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

template<typename T>
inline 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...);
}

constexpr int multiply_two(int a)
{
return a * 2;
}

int main()
{

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

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;

}
@

without any warning or errors
but it will pop out warning if I use Qt5

ld: warning: directory not found for option ‘-F/Users/yyyy/Qt5.0.1/5.0.1/clang_64/qtbase/lib’