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

alexisdm

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

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

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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.

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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++?

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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

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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?

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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.

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@
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

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[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.

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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.

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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

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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'

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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’

alexisdm

With clang, the linker doesn't get the -stdlib=libc++ option, so it was trying to link with libstdc++:
@clang++ -headerpad_max_install_names -mmacosx-version-min=10.6 -o test01 main.o @

Try adding:
@LIBS += -stdlib=libc++ -std=c++11@

I'm not sure if -std=c++11 is needed for the linker.

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[quote author="alexisdm" date="1360328228"]With clang, the linker doesn't get the -stdlib=libc++ option, so it was trying to link with libstdc++:
@clang++ -headerpad_max_install_names -mmacosx-version-min=10.6 -o test01 main.o @

Try adding:
@LIBS += -stdlib=libc++ -std=c++11@

I'm not sure if -std=c++11 is needed for the linker.[/quote]

Thanks, the problem finally solved(half)

The .pro file
@
TEMPLATE = app
CONFIG += console
CONFIG -= app_bundle
CONFIG -= qt
#CONFIG += c++11

SOURCES += main.cpp

LIBS += -stdlib=libc++ #don't need -std=c++11

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

Not done yet, we have to change the parameters of the makefile too

@
####### Compiler, tools and options

CC = clang
CXX = clang++
DEFINES =
CFLAGS = -pipe -mmacosx-version-min=10.7 -O2 -Wall -W -fPIE $(DEFINES)
CXXFLAGS = -pipe -mmacosx-version-min=10.7 -stdlib=libc++ -std=c++11 -mmacosx-version-min=10.7 -O2 -Wall -W -fPIE $(DEFINES)
INCPATH = -I../../../yyyy/Qt5.0.1/5.0.1/clang_64/mkspecs/macx-clang -I.
LINK = clang++
LFLAGS = -headerpad_max_install_names -mmacosx-version-min=10.7
LIBS = $(SUBLIBS) -stdlib=libc++
AR = ar cq
RANLIB = ranlib -s
QMAKE = /Users/yyyy/Qt5.0.1/5.0.1/clang_64/bin/qmake
@

change 10.6 to 10.7 since
QMAKE_CXXFLAGS += -mmacosx-version-min=10.7 or
QMAKE_MACOSX_DEPLOYMENT_TARGET = 10.7
would not change the mmacosx-version-min to 10.7

Thanks for your big helps, If I am familiar with makefile
This problem could be solved faster

But it would generate the warning message
ld: warning: directory not found for option '-F/Users/yyyy/Qt5.0.1/5.0.1/clang_64/qtbase/lib'

After I go into the path and type ls -al, I really don't have anything called /qtbase/lib

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Do some change on .pro file

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

SOURCES += main.cpp

LIBS += -stdlib=libc++

QMAKE_CXXFLAGS += -stdlib=libc++
QMAKE_CXXFLAGS += -std=c++11
QMAKE_CXXFLAGS += -mmacosx-version-min=10.7
QMAKE_LFLAGS += -mmacosx-version-min=10.7
@

Don't need to alter the makefile by hand

The warning still exist, do I need to solve the warning message?
Or I could simply ignore it?

Oh man, I hope that the support of c++11 could become mature ASAP
then all of us don't need to go through so many trouble
when we want to use it.

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According to the sites
"Qt bug":https://bugreports.qt-project.org/browse/QTBUG-28336

This warning could be ignored, let us hope that Qt5.1 will fixe this bug