-MM and -MMD are not ignoring #include <xx.h> files

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Hi,

I've been tearing my hair out with this one.  I have reduced it to something
really simple:

-- start hack.cpp
#include <a.h>
#include "b.h"

int main()
{
   return 0;
}
-- end hack.cpp

-- start bash shell commands

~/sandbox/proper-dependancy [41]$ touch a.h b.h 

~/sandbox/proper-dependancy [44]$ gcc -M hack.cpp -I .
hack.o: hack.cpp a.h b.h
~/sandbox/proper-dependancy [45]$ gcc -MM hack.cpp -I .
hack.o: hack.cpp a.h b.h
~/sandbox/proper-dependancy [46]$ /opt/GDStools/pkgs/pd/gcc/3.4.1/bin/g++
-MM hack.cpp -I .
hack.o: hack.cpp ./a.h b.h
~/sandbox/proper-dependancy [47]$ /opt/GDStools/pkgs/pd/gcc/3.4.1/bin/g++ -M
hack.cpp -I .
hack.o: hack.cpp ./a.h b.h
~/sandbox/proper-dependancy [48]$ gcc --version
gcc (GCC) 3.2.3
Copyright (C) 2002 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

~/sandbox/proper-dependancy [49]$ /opt/GDStools/pkgs/pd/gcc/3.4.1/bin/g++
--version
g++ (GCC) 3.4.1
Copyright (C) 2004 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

-- end of bash shell commands

Now I thought that -MM should not include <a.h> in the depenancy list.

What's going on.  What am I missing?

Thanks,
Tim

--LongSig


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