Problem with debugging in Qt Creator when library contains thread_local

[mikek_dk]

Hi,

I have an issue that I hope someone can help with. I'm building a multithreaded application, using C++11 thread_local to get thread specific memory. My problem is that when I use a statically linked library and this library uses thread_locale, then I get a "SIGSEGV" (Segmentation fault) when ever I try to single step with the debugger over the statement that has the thread_local. (If just run the program, or move the code out of the lib then all seems fine).

I have simplified the progam to the following:

main.pro:
@TEMPLATE = subdirs

SUBDIRS +=
lib
app@

app.pro:
@

Turn on C++11 support

QMAKE_CXXFLAGS = -std=c++11
CONFIG += c++11

Turn on thread support

LIBS += -pthread

QT += core

QT -= gui

TARGET = app
CONFIG += console
CONFIG -= app_bundle

TEMPLATE = app

SOURCES += main.cpp

unix:!macx: LIBS += -L$$OUT_PWD/../lib/ -llib

INCLUDEPATH += $$PWD/../lib
DEPENDPATH += $$PWD/../lib

unix:!macx: PRE_TARGETDEPS += $$OUT_PWD/../lib/liblib.a@

main.cpp:
@#include <QCoreApplication>

#include "lib.h"

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

QCoreApplication a(argc, argv);
Lib lib;

return a.exec();
}@

lib.pro:
@# Turn on C++11 support
QMAKE_CXXFLAGS = -std=c++11
CONFIG += c++11

Turn on thread support

LIBS += -pthread

QT -= gui

TARGET = lib
TEMPLATE = lib
CONFIG += staticlib

SOURCES += lib.cpp

HEADERS += lib.h
unix {
target.path = /usr/lib
INSTALLS += target
}@

lib.h:
@#ifndef LIB_H
#define LIB_H

class Lib
{

public:
Lib();
};

#endif // LIB_H@

@#include "lib.h"

Lib::Lib()
{
static thread_local int i;

i++; // << When single stepping, this line crashes the program
}@

I'm guessing there is something basic that I'm missing?

(Qt Creator 3.3.0, with QT 5.4.0, running Ubuntu 14.04 LTS.)