Fix for segmentation fault before main when using OpenGL functions AND std under Linux Ubuntu.

gl-pthread-fix.cpp

/*
Fix for segmentation fault before main
when Using OpenGL functions AND std
under Linux Ubuntu.

2016-10-25	luismrsilva





The problem is similar to this (solution is based on it too):

http://stackoverflow.com/questions/31579243/segmentation-fault-before-main-when-using-glut-and-stdstring

To see details use:
$ export LD_DEBUG=all
before running.



Fix:
Link with -pthread

If it does not work, also put the following code somewhere to make g++ assume pthread is used.



*/


// We check for __unix__ because this was only tested on Linux.

#if defined(__unix__)


#include <pthread.h>
void* simpleFunc(void*) {
	return NULL;
}
void forcePThreadLink() {
	pthread_t t1;
	pthread_create(&t1, NULL, &simpleFunc, NULL);
}

#endif

Hello! I run into the same problem, so thanks for the snippet!

I used pthread_getconcurrency instead to make it a little simpler, as in:

#if defined __unix__

#include <pthread.h>
void forcePThreadLink() {
    pthread_getconcurrency();
}

#endif

As far as I can tell, this is only needed with g++: -pthead is enough for clang++.