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/* C99 6.10.8 para 4: None of [the predefined macro names] shall be

   the subject of a #define or an #undef preprocessing directive.  */

/* { dg-do preprocess } */

#undef __DATE__         /* { dg-warning "undefining" "__DATE__" } */

#undef __TIME__         /* { dg-warning "undefining" "__TIME__" } */

#undef __FILE__         /* { dg-warning "undefining" "__FILE__" } */

#undef __LINE__         /* { dg-warning "undefining" "__LINE__" } */

#undef __STDC__         /* { dg-warning "undefining" "__STDC__" } */

/* These should be protected from #undef, but aren't, because they

   are set with normal #define commands - and on top of that, some

   of them are library properties, outside our control.  To consider:

   warn about undefining/redefining any identifier beginning with

   __STDC_ .

   __STDC_HOSTED__

   __STDC_VERSION__

   __STDC_IEC_559__

   __STDC_IEC_559_COMPLEX__

   __STDC_ISO_10646__

 */