Please describe the problem:
Using GStaticMutex in my code results in gcc warning "dereferencing type-punned pointer will break strict-aliasing rules are generated".


Steps to reproduce:
1. make some program using GStaticMutex
2. compile with gcc -fstrict-aliasing -Wstrict-aliasing



Actual results:
warning: dereferencing type-punned pointer will break strict-aliasing rules

Expected results:
no warning

Does this happen every time?
yes

Other information:
simple example:
-------- ex.c --------------------
#include <glib.h>

int main()
{
	g_thread_init(NULL);
	static GStaticMutex mutex = G_STATIC_MUTEX_INIT;
    	g_static_mutex_lock (&mutex);
    	g_static_mutex_unlock (&mutex);
	return 0;
}
-----------------------------
gcc -Wall -fstrict-aliasing -Wstrict-aliasing `pkg-config --cflags glib-2.0` -o ex ex.c `pkg-config --libs glib-2.0 gthread-2.0`

=>
ex.c: In function 'main':
ex.c:7: warning: dereferencing type-punned pointer will break strict-aliasing rules
ex.c:8: warning: dereferencing type-punned pointer will break strict-aliasing rules


I thing the problem is casting in g_static_mutex_* macros