gcc/testsuite/gcc.dg/asm-1.c

   1 /* { dg-do compile { target i?86-*-* x86_64-*-* } } */
   2
   3 struct x {
   4   int selector;
   5 };
   6
   7 void f()
   8 {
   9   struct x* addr;
  10   __asm__("mov %%gs,%0":"=r" ((unsigned short)addr->selector)); /* { dg-error "lvalue" "casts make rvalues" } */
  11 }