[PATCH 0/7] unused argc/argv/prefix parameters

More from my -Wunused-parameter silencing. The first one actually fixes a bug. The second is a cleanup, and the rest are just UNUSED annotations (but grouped into similar cases).

  [1/7]: fast-import: fix file access when run from subdir
  [2/7]: builtins: always pass prefix to parse_options()
  [3/7]: builtins: annotate always-empty prefix parameters
  [4/7]: builtins: mark unused prefix parameters
  [5/7]: mark "argv" as unused when we check argc
  [6/7]: t/helper: mark unused argv/argc arguments
  [7/7]: parse-options: drop parse_opt_unknown_cb()

 builtin.h                            | 10 ++++++++++
 builtin/check-ref-format.c           |  2 ++
 builtin/credential.c                 |  2 +-
 builtin/diff.c                       |  6 +++---
 builtin/fast-import.c                | 10 ++++++++--
 builtin/fetch-pack.c                 |  2 +-
 builtin/fsmonitor--daemon.c          |  2 +-
 builtin/get-tar-commit-id.c          |  4 +++-
 builtin/mailsplit.c                  |  2 ++
 builtin/merge-index.c                |  2 +-
 builtin/merge-ours.c                 |  2 +-
 builtin/merge-recursive.c            |  2 +-
 builtin/mktag.c                      |  2 +-
 builtin/pack-redundant.c             |  2 +-
 builtin/remote-ext.c                 |  2 ++
 builtin/remote-fd.c                  |  2 ++
 builtin/revert.c                     |  9 +++++----
 builtin/stash.c                      |  2 +-
 builtin/submodule--helper.c          |  2 +-
 builtin/unpack-file.c                |  2 +-
 builtin/unpack-objects.c             |  2 +-
 builtin/upload-archive.c             |  2 ++
 builtin/var.c                        |  2 +-
 parse-options-cb.c                   | 15 --------------
 parse-options.h                      |  3 ---
 scalar.c                             |  2 +-
 t/helper/test-ctype.c                |  2 +-
 t/helper/test-date.c                 |  2 +-
 t/helper/test-drop-caches.c          |  2 +-
 t/helper/test-dump-cache-tree.c      |  2 +-
 t/helper/test-dump-fsmonitor.c       |  2 +-
 t/helper/test-dump-split-index.c     |  2 +-
 t/helper/test-dump-untracked-cache.c |  2 +-
 t/helper/test-example-decorate.c     |  2 +-
 t/helper/test-fsmonitor-client.c     |  2 +-
 t/helper/test-hexdump.c              |  2 +-
 t/helper/test-index-version.c        |  2 +-
 t/helper/test-match-trees.c          |  2 +-
 t/helper/test-oid-array.c            |  2 +-
 t/helper/test-oidmap.c               |  2 +-
 t/helper/test-oidtree.c              |  4 ++--
 t/helper/test-online-cpus.c          |  2 +-
 t/helper/test-parse-options.c        |  4 ++--
 t/helper/test-prio-queue.c           |  2 +-
 t/helper/test-read-graph.c           |  2 +-
 t/helper/test-ref-store.c            |  5 +++--
 t/helper/test-scrap-cache-tree.c     |  2 +-
 t/helper/test-sigchain.c             |  2 +-
 t/helper/test-strcmp-offset.c        |  2 +-
 t/helper/test-submodule-config.c     |  2 +-
 t/helper/test-submodule.c            |  2 +-
 t/helper/test-trace2.c               |  6 +++---
 t/helper/test-xml-encode.c           |  2 +-
 t/t9304-fast-import-marks.sh         | 29 ++++++++++++++++++++++++++++
 54 files changed, 115 insertions(+), 74 deletions(-)