Qt 5, C++11, and mac?

CroCo

I'm using qmake to build my project. I'm using
Mac 10.7.5
Xcode Version 4.3.3
Qt 5

in ".pro"
@QT += core
QT -= gui

--------- Project Settings -------------

TEMPLATE = app
TARGET = test
CONFIG -= app_bundle
CONFIG += console
CONFIG += c++11 # <----- it doesn't work
SOURCES += main.cpp@

I'm still getting errors. The compiler doesn't know where are the header files for C++11.
Any suggestions?

In Xcode, I have to do the following settings
Build Options:
Compiler for C/C++/Objective-C --------------> Apple LLVM compiler 3.1
Apple LLVM compiler 3.1 - Language:
C++ Language -------------> C++11[-std=c++11]
C++ Standard Library --------------> libc++ (LLVM C++ standard library with C++11 support)

Jeroentjehome

Hi,
Maybe post this question in the tools forum instead of the General forum. There they might have an idea.

CroCo

[quote author="Jeroentje@home" date="1393493243"]Hi,
Maybe post this question in the tools forum instead of the General forum. There they might have an idea.
[/quote]

Should I remove it or just post another post?

hskoglund

Hi, try to add this line to your .pro file:
@MAKE_CXXFLAGS += -std=c++0x -stdlib=libc+@

(you need this line if you are using Qt earlier than 5.2)
(also try to update your Xcode to v.5)

CroCo

[quote author="hskoglund" date="1393493638"]Hi, try to add this line to your .pro file:
@MAKE_CXXFLAGS += -std=c++0x -stdlib=libc+@

(you need this line if you are using Qt earlier than 5.2)
(also try to update your Xcode to v.5)
[/quote]

It doesn't work.

hskoglund

Hmmm, I had the same problem last year with Qt 5.1.

Since then I've upgraded my project to Qt 5.2.1 and Xcode 5.02 and now I only need that line in my .pro file: (same as yours, works ok)
@config += c++11@

Also make sure it is a small c and not a capital C "see my blog post":http://www.tripleboot.org/?p=101

CroCo

Still no hope. I'm not using Xcode 5.02, I'm not certain if this is the problem.

CroCo

In Xcode, I have to do the following settings
Build Options:
Compiler for C/C++/Objective-C ———————> Apple LLVM compiler 3.1
Apple LLVM compiler 3.1 – Language:
C++ Language ——————-> C++11[-std=c++11]
C++ Standard Library ———————> libc++ (LLVM C++ standard library with C++11 support)

sierdzio

You need to inform Qt that libc++ is used instead of libstdc++.

CroCo

[quote author="sierdzio" date="1393494925"]You need to inform Qt that libc++ is used instead of libstdc++.[/quote]

How?

sierdzio

See "here":http://stackoverflow.com/questions/14749315/clang-under-qtcreator-cant-work-with-c11.

CroCo

Still not working. :'(

hskoglund

I'm guessing here but I seem to remember, LLVM 3.1 was a bit too old for proper C++11 support, so when LLVM 3.2 came out late 2012, C++11 worked much better in Xcode.

Why not trying upgrade your Xcode... it is not so expensive :-)

EDIT: since you're on Lion, Xcode 5 is not kosher, instead you can update to Xcode 4.6.3, which comes with LLVM 3.2 as well.

CroCo

[quote author="hskoglund" date="1393496084"]I'm guessing here but I seem to remember, LLVM 3.1 was a bit too old for proper C++11 support, so when LLVM 3.2 came out late 2012, C++11 worked much better in Xcode.

Why not trying upgrade your Xcode... it is not so expensive :-)

EDIT: since you're on Lion, Xcode 5 is not kosher, instead you can update to Xcode 4.6.3, which comes with LLVM 3.2 as well.[/quote]

I can't upgrade Xcode because my mac version < 10.8 (really sad)

CroCo

And g++ is giving me this erros
cc1plus: error: unrecognized command line option "-stdlib=libc++"
cc1plus: error: unrecognized command line option "-std=c++0x"

hskoglund

(just edited my prev. post): yeah, I forgot you're on Lion, but as I said, Xcode 4.6.3 is the one you could try...

CroCo

C++11 is working in Xcode, but I'm facing problem with the proper settings for qmake project. I've posted the settings in Xcode for c++11