[Bug preprocessor/15933] New: Caching of include files breaks compilation

["aj at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

Consider (this comes from SPEC2k 181.mcf):
limits.h:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#define my_limits 1
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
test-includes.c:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#include <limits.h>
#include "limits.h"

int
main (void)
{
#ifndef my_limits
#error "wrong limits included"
#endif
  return 0;
}
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

With GCC 3.4 both files are included but GCC 3.5 CVS of today not.
This has been broken between the tree-ssa merge and 2004-06-07.

-- 
           Summary: Caching of include files breaks compilation
           Product: gcc
           Version: 3.5.0
            Status: UNCONFIRMED
          Severity: critical
          Priority: P2
         Component: preprocessor
        AssignedTo: zack at codesourcery dot com
        ReportedBy: aj at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: x86_64-linux-gnu
  GCC host triplet: x86_64-linux-gnu
GCC target triplet: x86_64-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15933