https://bugs.llvm.org/show_bug.cgi?id=52450

            Bug ID: 52450
           Summary: Support P1689 dependency format
           Product: clang
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++2a
          Assignee: unassignedclangb...@nondot.org
          Reporter: bugzilla.l...@me.benboeckel.net
                CC: blitzrak...@gmail.com, erik.pilking...@gmail.com,
                    llvm-bugs@lists.llvm.org, richard-l...@metafoo.co.uk

Clang should support the P1689 dependency format for modules:

    https://wg21.link/p1689

I have a patch to GCC
(https://github.com/mathstuf/cxx-modules-sandbox/blob/docker/trtbd.diff) to
submit that uses the following command line flags:

`-fdep-format=` The format to write dependency information out in. Currently,
it uses `trtbd` which stands for "TR to be determined", but bikeshedding needs
to commence at some point I suppose. Ideas: `p1689`, `tr2222` (the SG15 TR
reserved number).

`-fdep-output=` is the name of the primary output for the future compilation
(the `-o` the real compile will see). This is analogous to `-MT`.

`-fdep-file=` is the file to write the information to.

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