Re: [PATCH v2 2/2] ci: compile "linux-gcc-default" job with -Og

[Junio C Hamano <gitster@pobox.com>]

Patrick Steinhardt <ps@pks.im> writes:

> While we could adapt all jobs to compile with `-Og` now, that would
> potentially mask other warnings that only get diagnosed with `-O2`.
> Instead, adapt the "linux-gcc-default" job to compile with `-Og`.

It seems that we are already triggering for 'seen'.  I haven't
checked if that is a false positive or a real problem, though.

https://github.com/git/git/actions/runs/9407652417/job/25913907166#step:4:139

  pack-mtimes.c: In function ‘load_pack_mtimes_file’:
  Error: pack-mtimes.c:89:25: ‘mtimes_size’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
     89 |                         munmap(data, mtimes_size);
        |                         ^~~~~~~~~~~~~~~~~~~~~~~~~
  cc1: all warnings being treated as errors
  make: *** [Makefile:2757: pack-mtimes.o] Error 1
  make: *** Waiting for unfinished jobs....
  pack-revindex.c: In function ‘load_revindex_from_disk’:
  Error: pack-revindex.c:260:25: ‘revindex_size’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
    260 |                         munmap(data, revindex_size);
        |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~
  cc1: all warnings being treated as errors
  make: *** [Makefile:2757: pack-revindex.o] Error 1
  cat: exit.status: No such file or directory