/* { dg-do compile } *//* { dg-options "-Wall -Wshadow" } */extern double strtod (const char *, char **);#define UNUSED __attribute__ ((unused))/* A built-in function may be overridden by an old-style definition   specifying too few arguments... */double cos (){  /* { dg-warning "shadows a built-in" } */  /* { dg-warning "warning: number of arguments doesn't match built-in prototype" "built-in" { target *-*-* } 10 } */  return strtod ("nan", 0);}/* the right number, but the wrong type, arguments... */double sin (foo)     int foo UNUSED;  /* { dg-warning "shadows a built-in" } */{  /* { dg-warning "warning: argument 'foo' doesn't match built-in prototype" } */  return strtod ("nan", 0);}/* or too many arguments.  */long double cosl (foo, bar)     const char *foo UNUSED;  /* { dg-warning "shadows a built-in" } */     int bar UNUSED;{  /* { dg-warning "warning: number of arguments doesn't match built-in prototype" } */  /* { dg-warning "warning: argument 'foo' doesn't match built-in prototype" "foo" { target *-*-* } 26 } */  return strtod ("nan", 0);}