gcc-4.9/gcc/testsuite/gcc.dg/pr20368-2.c


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/* ICE with -Wstrict-prototypes and typeof an undeclared function.
   Bug 20368.  Test with -Wmissing-prototypes.  */
/* { dg-do compile } */
/* { dg-options "-Wmissing-prototypes" } */

extern __typeof (f) g; /* { dg-error "'f' undeclared here \\(not in a function\\)" } */

int
f (x) /* { dg-warning "no previous prototype for 'f'" } */
     float x;
{
}