Quick Tip #1 for New GTK+ Programmers

[c_07]

After drafting my first program using the GTK+ library:

#include <gtk/gtk.h>

int main(int argc, char *argv[]) {
	GtkWidget *window;
	
	gtk_init(&argc, &argv);
	
	window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
	gtk_widget_show(window);
	
	gtk_main();
	
	return 0;
}

I tried to compile it:

[Cam@localhost simple]$ gcc simplewindow.cpp -o simplewindow `pkg-config --cflags --libs gtk+-2.0`
/tmp/ccpifIYo.o:(.eh_frame+0x11): undefined reference to `__gxx_personality_v0'
collect2: ld returned 1 exit status

After a little searching, I found that this was the result of using the C compiler (gcc) on a C++ project. The solution: Use G++!!!

[Cam@localhost simple]$ g++ simplewindow.cpp -o simplewindow `pkg-config --cflags --libs gtk+-2.0`

This was a simple enough fix, and a stupid error, but I thought it was confusing enough for a beginning linux programmer to post its solution

I intend to post on the various mountains I encounter while beginning my GTK+ linux programming journey... but meanwhile, I hope this helps you.

[ibbo]

It should not throw an error because gtk.h can and is used by both C and C++ programs. Your problem was you named your file .cpp and then used a c compiler and fed it a cpp file.

Thats what it complained about and not the use of c instead of cpp.

[mwette]

Well, the file looks like C so if you would have ended it with .c instead of .cpp it would have worked.

$ gcc simplewindow.c -o simplewindow `pkg-config --cflags --libs gtk+-2.0`
$

If you feed gcc a .cpp file it will use the c++ compiler but it won't pass in the correct libraries.

[c_07]

Ah, I see.

Eventually I would have run into the same problem, though, because I am a C++ programmer, not a C programmer