std::thread run time error "Enable multithreading to use std::thread: Operation not permitted"

[dhan2308]

I am trying to port a program that was running without any problem when the environment set up was
Ubuntu 12.0
QTCreator Version - 2.4.1
QT - 4.8.0
gcc - 4.6.3 to a new environment

Ubuntu 14.04
QTCreator Version - 3.0.1
QT - 5.2.1
gcc - 4.8

Unfortunately I end up seeing a runtime error "terminate called after throwing an instance of 'std::system_error' what(): Enable multithreading to use std::thread:Operation not permitted"

As per my understanding this seems to be an issue with compiler compatibility. Either I miss some options during compilations or a bug from compiler.

How to get his fixed? Any help is greatly appreciated.

[A Former User]

Hi, and welcome to the Qt forum!
That's a bug in the Ubuntu gcc package, see here. As a workaround it's suggested to add the following compiler flags: -Wl,--no-as-needed

[dhan2308]

@Wieland Thank you very much for the reply. I have tried that and still see the same issue. Please find my compile output. Any issue with the compiler options?

++ -c -pipe -std=c++11 -pthread -O2 -Wall -W -D_REENTRANT -fPIE -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -I/usr/lib/i386-linux-gnu/qt5/mkspecs/linux-g++ -I../SimulatorSiteControl -I/usr/include/qt5 -I/usr/include/qt5/QtGui -I/usr/include/qt5/QtCore -I. -I. -o map.o ../SimulatorSiteControl/Map/map.cpp
g++ -Wl,-O1 -o SimulatorSimulatorSiteControl main.o simulator.o map.o cbmapnotification.o notifymapactivestate.o -lQt5Gui -L/usr/lib/i386-linux-gnu -lQt5Core -lGL -lpthread

[A Former User]

Are you using qmake for this? How did you add the suggested compiler options?

[kshegunov]

@Wieland
It can't be qmake, as in my experience qmake generates the make compile lines with -fPIC and doesn't rely on the "position independent executable" option in g++. Also switching from one optimization level to the other between compiler and linker is odd ...

[dhan2308]

@Wieland, @kshegunov ,

Its qmake as per my understanding. I tried adding QMAKE_CXXFLAGS += -Wl,--no-as-needed and CONFIG += -Wl,--no-as-needed in .pro file. Both options generate the same output.
Please find compiler output
11:22:41: Running steps for project SimulatorSimulatorSiteControl...
11:22:41: Starting: "/usr/lib/i386-linux-gnu/qt5/bin/qmake" /home/dhanesh/Simulator/SimulatorSiteControl/SimulatorSimulatorSiteControl.pro -r -spec linux-g++ CONFIG+=declarative_debug CONFIG+=qml_debug
11:22:41: The process "/usr/lib/i386-linux-gnu/qt5/bin/qmake" exited normally.
11:22:41: Starting: "/usr/bin/make"

In generated makefile I see LFLAGS = -Wl,-O1

I still miss something and just not sure what it is.

[kshegunov]

@dhan2308
Do you mind sharing the project file you run through qmake?

[dhan2308]

QMAKE_CXXFLAGS += -std=c++11 -pthread
QMAKE_CXXFLAGS += -Wl,--no-as-needed
TEMPLATE = app
CONFIG += -console
CONFIG += -qt

SOURCES += main.cpp
simulator.cpp
Map/map.cpp
Map/Interface/cbmapnotification.cpp
Map/notifymapactivestate.cpp

HEADERS +=
Map/map.h
Common/Simlistener.h
Map/Interface/cbmapnotification.h
simulator.h
Map/notifymapactivestate.h
Common/SimEventQueueHandler.h

[kshegunov]

@dhan2308
Hello,

Why those lines?

CONFIG += -console
CONFIG += -qt

Additionally, c++11 can be passed as config, and there's in general no need to mess with the compiler/linker flags directly. Is your application a Qt GUI or do you have a console application; do you use Qt in it, or you just use qmake and Creator as build environment?

If you don't use Qt at all, you can try something along the lines (for a console app):

QT -= core gui  #< No Qt libraries

TEMPLATE = app

CONFIG += c++11 console #< Console application with C++11 enabled (if the compiler supports it)
CONFIG -= app_bundle

LIBS += -lpthread   #< Although, I think this is not necessary. I think qmake links that by default

SOURCES += ...
HEADERS += ...

[dhan2308]

Thank You All. Finally I got it working. The way I passed compiler option was wrong. Once again thank you very much for the support and guidance