[PATCH 0/13] parseopt fixes from -Wunused-parameters

Continuing my exploration of what -Wunused-parameters can show us, here are some bug-fixes related to parse-options callbacks.

This is the last of the actual bug-fixes I've found. After this, I have about 60 patches worth of cleanups (i.e., dropping the unused parameters), and then I have a series to annotate parameters that must be unused (e.g., for functions that must conform to callback interfaces). After we can start compiling with -Wunused-parameters, assuming we don't find the annotations too cumbersome.

But this series fixes real bugs. These first four fix segfaults:

  [01/13]: apply: mark include/exclude options as NONEG
  [02/13]: am: handle --no-patch-format option
  [03/13]: ls-files: mark exclude options as NONEG
  [04/13]: pack-objects: mark index-version option as NONEG

And these four fix cases where we just quietly do the wrong thing:

  [05/13]: cat-file: mark batch options with NONEG
  [06/13]: status: mark --find-renames option with NONEG
  [07/13]: format-patch: mark "--no-numbered" option with NONEG
  [08/13]: show-branch: mark --reflog option as NONEG

These ones are just message improvements:

  [09/13]: tag: mark "--message" option with NONEG
  [10/13]: cat-file: report an error on multiple --batch options
  [11/13]: apply: return -1 from option callback instead of calling exit(1)

This one is a segfault, but it has no callers. ;)

  [12/13]: parse-options: drop OPT_DATE()

And then this last one is mostly about annotating the callbacks. It doesn't strictly need to happen here, but the alternative is that I'd eventually have to deal with it in the later series I mentioned.

  [13/13]: assert NOARG/NONEG behavior of parse-options callbacks

 apply.c                       | 24 +++++++++++++++++++++---
 builtin/am.c                  |  4 +++-
 builtin/blame.c               |  4 ++++
 builtin/cat-file.c            | 10 +++++++---
 builtin/checkout-index.c      |  2 ++
 builtin/clean.c               |  1 +
 builtin/commit.c              |  5 ++++-
 builtin/fetch.c               |  2 ++
 builtin/grep.c                | 14 +++++++++++++-
 builtin/init-db.c             |  1 +
 builtin/interpret-trailers.c  |  2 ++
 builtin/log.c                 | 12 +++++++++++-
 builtin/ls-files.c            | 14 +++++++++++---
 builtin/merge-file.c          |  2 ++
 builtin/merge.c               |  1 +
 builtin/notes.c               |  7 +++++++
 builtin/pack-objects.c        |  5 ++++-
 builtin/read-tree.c           |  3 +++
 builtin/rebase.c              |  6 ++++++
 builtin/show-branch.c         |  3 ++-
 builtin/show-ref.c            |  1 +
 builtin/tag.c                 |  6 ++++--
 builtin/update-index.c        | 21 +++++++++++++++++++--
 parse-options-cb.c            | 14 +++++++-------
 parse-options.h               | 18 ++++++++++++++----
 ref-filter.c                  |  2 ++
 t/helper/test-parse-options.c |  2 +-
 t/t0040-parse-options.sh      | 22 ----------------------
 28 files changed, 155 insertions(+), 53 deletions(-)

-Peff