[Bug preprocessor/31851] New: -MT doesn't overwrite the default target when used with -M(M)D and -o

["c dot matuszewski at gmx dot de" <gcc-bugzilla at gcc dot gnu dot org>]

Suppose, you have the following C-File (input.c), empty.h is just an empty
file:

#include "empty.h"
void dummy(void) {
}

Issue the command:
gcc -c input.c -MD -MT foo.o -o input.o

The content of input.d is:
foo.o input.o: input.c empty.h

but I would expect:
foo.o: input.c empty.h
which also is the output of "gcc -c input.c -MD -MT foo.o"

The documentation says:
-MD: [...] if used without `-E', each `-o' is understood to specify a target
object file.

OK, but:
-MT: [...] An `-MT' option will set the target to be exactly the string you
specify.

I would prefer that -MT always overwrites the targets (as it does with -M and
-MM).

I tested also with gcc 3.4.4 and 3.4.6 and the behaviour is the same as with
4.1.1


-- 
           Summary: -MT doesn't overwrite the default target when used with
                    -M(M)D and -o
           Product: gcc
           Version: 4.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: preprocessor
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: c dot matuszewski at gmx dot de


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31851