gcc/libstdc++/pure.c

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#include <stdio.h>
#ifdef __GNU_LIBRARY__
/* Avoid forcing the library's meaning of `write' on the user program
by using the "internal" name (for use within the library) */
#define write(fd, buf, n) __write((fd), (buf), (n))
#endif
#define MESSAGE "pure virtual method called\n"
void
__pure_virtual (void)
{
write (2, MESSAGE, sizeof (MESSAGE) - 1);
__terminate ();
}