gcc/testsuite/gcc.dg/plugin/plugindir4.c

/* { dg-do preprocess } */
/* { dg-options "-iplugindir=my-plugindir -fplugin=foo" } */

/* { dg-prune-output ".*inaccessible plugin file.*my-plugindir/foo\.(so|dylib) expanded from short plugin name.*" } */