"symbol(s) not found for architecture x86_64" error when compiling a Qt project on Mac

[Donald Duck]

@jsulm It won't let me post the build log because it's too long, but you can see it here.

[SGaist]

From what I can see you must add to the LIBS variable the framework that Irrlicht requires like Core Foundation and the other concerned by the missing symbols messages.

[Donald Duck]

@SGaist How can I find out what framework that is?

[SGaist]

You can search the missing symbols on the Apple developer website or google you'll get the matching framework there.

Or take a look at the Irrlicht project files.

[Donald Duck]

@SGaist Thanks, I managed to get it to link almost all those symbols by adding the frameworks CoreFoundation, CoreGraphics and AppKit. But there are three that are still not working: std::_Rb_tree_decrement(std::_Rb_tree_node_base*), std::_Rb_tree_increment(std::_Rb_tree_node_base*) and std::_Rb_tree_insert_and_rebalance(bool, std::_Rb_tree_node_base*, std::_Rb_tree_node_base*, std::_Rb_tree_node_base&). I searched on Google for those but didn't find anything. What framework should I add to get those to work?

[SGaist]

Can you check what standard library Irrlicht uses ? Libc++ or libstdc++ ?

[Donald Duck]

@SGaist I tried libstdc++ and then those three symbols worked but there were a lot of others that stopped working. How can I use both libc++ and libstdc++ in the same project?

[SGaist]

I'd rather go with building Irrlicht with libc++

[Donald Duck]

@SGaist I added the following code in the .pro file and it compiled but it crashed at runtime:

LIBS += -framework CoreFoundation
LIBS += -framework CoreGraphics
LIBS += -framework AppKit
LIBS += -stdlib=libstdc++
LIBS += -lc++

This is what I got in the terminal when running it:

Last login: Mon May 15 12:57:25 on ttys000
/Users/donaldduck/Documents/build-untitled/Mac/untitled.app/Contents/MacOS/untitled ; exit;
donalds-iMac:~ donaldduck$ /Users/donaldduck/Documents/build-untitled/Mac/untitled.app/Contents/MacOS/untitled ; exit;
Irrlicht Engine version 1.8.4
Darwin Kernel Version 15.6.0: Thu Jun 23 18:25:34 PDT 2016; root:xnu-3248.60.10~1/RELEASE_X86_64
No doublebuffering available.
Segmentation fault: 11
logout
Saving session...
...copying shared history...
...saving history...truncating history files...
...completed.

[Process completed]

[SGaist]

You should run that through your debugger to see where exactly it's crashing.

[Donald Duck]

@SGaist According to the debugger, the thing that's crashing is const core::position2di& curr = ((CCursorControl *)CursorControl)->getPosition(); at line 1289 in the file CIrrDeviceMacOSX.mm. The part of my own code that calls this is the function irr::createDeviceEx, which is an Irrlicht function that I use in my code. Here is the complete code of the function that crashes (I added a comment at the line that crashes):

void CIrrDeviceMacOSX::storeMouseLocation()
{
	int x,y;

	if (Window != NULL)
	{
		NSPoint	p;
		p = [NSEvent mouseLocation];
		p = [Window convertScreenToBase:p];
		x = (int)p.x;
		y = DeviceHeight - (int)p.y;
	}
	else
	{
		CGEventRef ourEvent = CGEventCreate(NULL);
		CGPoint point = CGEventGetLocation(ourEvent);
		CFRelease(ourEvent);

		x = (int)point.x;
		y = (int)point.y;

		const core::position2di& curr = ((CCursorControl *)CursorControl)->getPosition();    //This is the line that crashes
		if (curr.X != x || curr.Y != y)
		{
			// In fullscreen mode, events are not sent regularly so rely on polling
			irr::SEvent ievent;
			ievent.EventType = irr::EET_MOUSE_INPUT_EVENT;
			ievent.MouseInput.Event = irr::EMIE_MOUSE_MOVED;
			ievent.MouseInput.X = x;
			ievent.MouseInput.Y = y;
			postEventFromUser(ievent);
		}
	}

	((CCursorControl *)CursorControl)->updateInternalCursorPosition(x,y);
}

[jsulm]

@Donald-Duck Most probably CursorControl is null pointer or dangling pointer. But I don't know why. Maybe you're doing something wrong in your code?

[Donald Duck]

@jsulm That's not my code, it's Irrlicht's code. Irrlicht is a library that I'm using. I don't think there is anything wrong in my own code since it compiles and runs just fine on Windows and Linux.

[SGaist]

Hence my suggestion to re-build Irrlicht against the same C++ library as Qt.

[jsulm]

@Donald-Duck said in "symbol(s) not found for architecture x86_64" error when compiling a Qt project on Mac:

I don't think there is anything wrong in my own code since it compiles and runs just fine on Windows and Linux

From my own experience I know that such assumptions are often wrong :-)
But you should follow what @SGaist suggested.

[Donald Duck]

@SGaist I tried rebuilding libIrrlicht.a with libc++ and without adding LIBS += -stdlib=libc++ and LIBS += -lc++ to my .pro file and it compiled and crashed just like first. It crashed at exactly the same place with exactly the same error.

[Donald Duck]

@jsulm I tested to see if the problem was in my code or in Irrlicht by copy-pasting a code from an Irrlicht tutorial that I know is correct into a new project and it crashed just like in my project. So the problem isn't in my code but in the Irrlicht library.

[SGaist]

To be sure we're on the same page, you are calling irr::createDeviceEx and this crashes, right ?

[Donald Duck]

@SGaist Yes.

[SGaist]

Since you are building Irrlicht anyway, I'd add some checks for CursorControl to see whether the pointer is null or just invalid.