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



------- Comment #16 from cgd at google dot com  2010-02-07 21:24 -------
(In reply to comment #15)
> *** Bug 42921 has been marked as a duplicate of this bug. ***
> 

FWIW, I actually think that's a different issue (though certainly related).

this bug was all about -MD and -MMD -- and what happens when an object file
needs to be output, but cannot be because of a missing include.

AFAICT, that bug is all about, what should the handling of -MM be vs. missing
system headers.

That having been said, I will note that with:
gcc version 3.4.4 (cygming special, gdc 0.12, using dmd 0.125)

you get the results:

[cgd@laptop tmp]$ echo "#include <does_not_exist.h>" > foo.c
[cgd@laptop tmp]$ gcc -MM -MF foo.d foo.c && echo succeeded || echo failed
foo.c:1:28: does_not_exist.h: No such file or directory
failed
[cgd@laptop tmp]$ echo '#include "does_not_exist.h"' > foo.c
[cgd@laptop tmp]$ gcc -MM -MF foo.d foo.c && echo succeeded || echo failed
foo.c:1:28: does_not_exist.h: No such file or directory
failed

So this certainly used to behave as the submitter of 42921 expected at *some*
point.

As of 4.2.2 (the next version I have handy after 3.4.4) the first case reported
"succeeded" (and the second failed).

--cgd


-- 


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


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