[Bug preprocessor/28435] New: -MMD vs not found system header (included from a system header)

[pinskia at gcc dot gnu dot org]

I really don't know if this is a bug or not but it seems to be.
The steps to reproduce:
mkdir sys
cat >sys/t.h <<FOO
#include <bogus.h>
FOO
cat > t.c <<FOO
#include <t.h>
FOO
gcc -isystem sys t.c -MMD


And notice that this actually compiles successfully even though bougs.h does
not exist.  And removing the -MMD option, it actually fails.


-- 
           Summary: -MMD vs not found system header (included from a system
                    header)
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: preprocessor
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pinskia at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28435