1.7.2: LTO exposes a lot of `-Wmaybe-uninitialized` issues

deps/ntlmclient/unicode_builtin.c: In function ‘unicode_builtin_encoding_convert’:
deps/ntlmclient/unicode_builtin.c:380:37: warning: pointer ‘out_19’ may be used after ‘realloc’ [-Wuse-after-free]
  380 |                 out_len = out_start - out;
      |                           ~~~~~~~~~~^~~~~
deps/ntlmclient/unicode_builtin.c:375:32: note: call to ‘realloc’ here
  375 |                 if ((new_out = realloc(out, out_size)) == NULL) {
      |                                ^~~~~~~~~~~~~~~~~~~~~~
src/util/futils.c:224:23: warning: argument 3 of type ‘unsigned char[32]’ with mismatched bound [-Warray-parameter=]
  224 |         unsigned char checksum[GIT_HASH_SHA256_SIZE],
      |         ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from src/util/futils.c:8:
src/util/futils.h:28:23: note: previously declared as ‘unsigned char[20]’
   28 |         unsigned char checksum[GIT_HASH_SHA1_SIZE],
      |         ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
At top level:
cc1: note: unrecognized command-line option ‘-Wno-documentation-deprecated-sync’ may have been intended to silence earlier diagnostics
cc1: note: unrecognized command-line option ‘-Wno-documentation-deprecated-sync’ may have been intended to silence earlier diagnostics
src/libgit2/transports/httpclient.c: In function ‘git_http_client_read_body’:
src/libgit2/transports/httpclient.c:1461:29: warning: storing the address of local variable ‘parser_context’ in ‘client_17(D)->parser.data’ [-Wdangling-pointer=]
 1461 |         client->parser.data = &parser_context;
      |         ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
src/libgit2/transports/httpclient.c:1441:29: note: ‘parser_context’ declared here
 1441 |         http_parser_context parser_context = {0};
      |                             ^~~~~~~~~~~~~~
src/libgit2/transports/httpclient.c:1437:26: note: ‘client’ declared here
 1437 |         git_http_client *client,
      |         ~~~~~~~~~~~~~~~~~^~~~~~
At top level:
cc1: note: unrecognized command-line option ‘-Wno-documentation-deprecated-sync’ may have been intended to silence earlier diagnostics
In function ‘git_regexp_match’,
    inlined from ‘git_config_backend_foreach_match’ at src/libgit2/config.c:532:17:
src/util/regexp.c:37:22: warning: ‘regex’ may be used uninitialized [-Wmaybe-uninitialized]
   37 |         if ((error = pcre_exec(*r, NULL, string, (int) strlen(string), 0, 0, NULL, 0)) < 0)
      |                      ^
src/libgit2/config.c: In function ‘git_config_backend_foreach_match’:
src/libgit2/config.c:516:20: note: ‘regex’ was declared here
  516 |         git_regexp regex;
      |                    ^
In function ‘git_fs_path_owner_is’,
    inlined from ‘validate_ownership_path’ at src/libgit2/repository.c:631:11,
    inlined from ‘validate_ownership’ at src/libgit2/repository.c:671:16,
    inlined from ‘git_repository_open_ext’ at src/libgit2/repository.c:1124:15:
src/util/fs_path.c:1990:45: warning: ‘sudo_uid’ may be used uninitialized [-Wmaybe-uninitialized]
 1990 |             sudo_uid_lookup(&sudo_uid) == 0 &&
      |                                             ^
src/util/fs_path.c: In function ‘git_repository_open_ext’:
src/util/fs_path.c:1959:21: note: ‘sudo_uid’ was declared here
 1959 |         uid_t euid, sudo_uid;
      |                     ^
In function ‘handle_next’,
    inlined from ‘test_dirent__diriter_with_fullname’ at tests/util/dirent.c:270:3:
tests/util/dirent.c:253:9: warning: ‘filename’ may be used uninitialized [-Wmaybe-uninitialized]
  253 |         cl_assert_equal_s(fullpath+4, filename);
      |         ^
tests/util/dirent.c: In function ‘test_dirent__diriter_with_fullname’:
tests/util/dirent.c:246:32: note: ‘filename’ was declared here
  246 |         const char *fullpath, *filename;
      |                                ^
In function ‘reflog_parse’,
    inlined from ‘refdb_reflog_fs__read’ at src/libgit2/refdb_fs.c:2090:15:
src/libgit2/refdb_fs.c:1968:20: warning: ‘c’ may be used uninitialized [-Wmaybe-uninitialized]
 1968 |                 if (c == '\t') {
      |                    ^
src/libgit2/refdb_fs.c: In function ‘refdb_reflog_fs__read’:
src/libgit2/refdb_fs.c:1949:22: note: ‘c’ was declared here
 1949 |                 char c;
      |                      ^
tests/util/strtol.c: In function ‘assert_l32_parses’:
tests/util/strtol.c:7:9: warning: ‘i’ may be used uninitialized [-Wmaybe-uninitialized]
    7 |         cl_assert_equal_i(i, expected);
      |         ^
tests/util/strtol.c:5:17: note: ‘i’ was declared here
    5 |         int32_t i;
      |                 ^
tests/util/strtol.c: In function ‘test_strtol__buffer_length_truncates’:
tests/util/strtol.c:97:9: warning: ‘i32’ may be used uninitialized [-Wmaybe-uninitialized]
   97 |         cl_assert_equal_i(i32, 1);
      |         ^
tests/util/strtol.c:93:17: note: ‘i32’ was declared here
   93 |         int32_t i32;
      |                 ^
In function ‘reflog_parse’,
    inlined from ‘refdb_reflog_fs__read’ at src/libgit2/refdb_fs.c:2090:15:
src/libgit2/refdb_fs.c:1968:20: warning: ‘c’ may be used uninitialized [-Wmaybe-uninitialized]
 1968 |                 if (c == '\t') {
      |                    ^
src/libgit2/refdb_fs.c: In function ‘refdb_reflog_fs__read’:
src/libgit2/refdb_fs.c:1949:22: note: ‘c’ was declared here
 1949 |                 char c;
      |                      ^
In function ‘git_fs_path_owner_is’,
    inlined from ‘validate_ownership_path’ at src/libgit2/repository.c:631:11,
    inlined from ‘validate_ownership’ at src/libgit2/repository.c:671:16,
    inlined from ‘git_repository_open_ext’ at src/libgit2/repository.c:1124:15:
src/util/fs_path.c:1990:45: warning: ‘sudo_uid’ may be used uninitialized [-Wmaybe-uninitialized]
 1990 |             sudo_uid_lookup(&sudo_uid) == 0 &&
      |                                             ^
src/util/fs_path.c: In function ‘git_repository_open_ext’:
src/util/fs_path.c:1959:21: note: ‘sudo_uid’ was declared here
 1959 |         uid_t euid, sudo_uid;
      |                     ^
src/libgit2/config.c: In function ‘git_config_get_multivar_foreach.constprop’:
src/libgit2/config.c:1000:23: warning: ‘iter’ may be used uninitialized [-Wmaybe-uninitialized]
 1000 |         while ((err = iter->next(&entry, iter)) == 0) {
      |                       ^
src/libgit2/config.c:993:30: note: ‘iter’ was declared here
  993 |         git_config_iterator *iter;
      |                              ^
tests/libgit2/status/worktree.c: In function ‘test_status_worktree__at_head_parent’:
tests/libgit2/status/worktree.c:1351:23: warning: ‘parent_tree’ may be used uninitialized [-Wmaybe-uninitialized]
 1351 |         opts.baseline = parent_tree;
      |                       ^
tests/libgit2/status/worktree.c:1337:19: note: ‘parent_tree’ was declared here
 1337 |         git_tree *parent_tree;
      |                   ^
In function ‘clar__assert’,
    inlined from ‘check_tree_entry’ at tests/libgit2/iterator/tree.c:270:2:
tests/clar/clar.c:708:12: warning: ‘te’ may be used uninitialized [-Wmaybe-uninitialized]
  708 |         if (condition)
      |            ^
tests/libgit2/iterator/tree.c: In function ‘check_tree_entry’:
tests/libgit2/iterator/tree.c:266:31: note: ‘te’ was declared here
  266 |         const git_tree_entry *te;
      |                               ^
tests/libgit2/iterator/tree.c: In function ‘check_tree_range’:
tests/libgit2/iterator/tree.c:371:9: warning: ‘head’ may be used uninitialized [-Wmaybe-uninitialized]
  371 |         cl_git_pass(git_iterator_for_tree(&i, head, &i_opts));
      |         ^
tests/libgit2/iterator/tree.c:360:19: note: ‘head’ was declared here
  360 |         git_tree *head;
      |                   ^
tests/libgit2/iterator/tree.c: In function ‘test_iterator_tree__icase_0’:
tests/libgit2/iterator/tree.c:418:9: warning: ‘head’ may be used uninitialized [-Wmaybe-uninitialized]
  418 |         cl_git_pass(git_iterator_for_tree(&i, head, NULL));
      |         ^
tests/libgit2/iterator/tree.c:411:19: note: ‘head’ was declared here
  411 |         git_tree *head;
      |                   ^
tests/libgit2/iterator/tree.c: In function ‘test_iterator_tree__icase_1’:
tests/libgit2/iterator/tree.c:454:9: warning: ‘head’ may be used uninitialized [-Wmaybe-uninitialized]
  454 |         cl_git_pass(git_iterator_for_tree(&i, head, &i_opts));
      |         ^
tests/libgit2/iterator/tree.c:442:19: note: ‘head’ was declared here
  442 |         git_tree *head;
      |                   ^
tests/libgit2/iterator/tree.c: In function ‘test_iterator_tree__icase_2’:
tests/libgit2/iterator/tree.c:596:9: warning: ‘head’ may be used uninitialized [-Wmaybe-uninitialized]
  596 |         cl_git_pass(git_iterator_for_tree(&i, head, NULL));
      |         ^
tests/libgit2/iterator/tree.c:545:19: note: ‘head’ was declared here
  545 |         git_tree *head;
      |                   ^
tests/libgit2/index/read_index.c: In function ‘test_index_read_index__initialize’:
tests/libgit2/index/read_index.c:19:9: warning: ‘head_ref’ may be used uninitialized [-Wmaybe-uninitialized]
   19 |         git_reference_free(head_ref);
      |         ^
tests/libgit2/index/read_index.c:12:24: note: ‘head_ref’ was declared here
   12 |         git_reference *head_ref;
      |                        ^
tests/libgit2/index/read_index.c:16:9: warning: ‘head’ may be used uninitialized [-Wmaybe-uninitialized]
   16 |         cl_git_pass(git_reset(_repo, head, GIT_RESET_HARD, NULL));
      |         ^
tests/libgit2/index/read_index.c:11:21: note: ‘head’ was declared here
   11 |         git_object *head;
      |                     ^
In function ‘reflog_parse’,
    inlined from ‘refdb_reflog_fs__read’ at src/libgit2/refdb_fs.c:2090:15:
src/libgit2/refdb_fs.c:1968:20: warning: ‘c’ may be used uninitialized [-Wmaybe-uninitialized]
 1968 |                 if (c == '\t') {
      |                    ^
src/libgit2/refdb_fs.c: In function ‘refdb_reflog_fs__read’:
src/libgit2/refdb_fs.c:1949:22: note: ‘c’ was declared here
 1949 |                 char c;
      |                      ^
In function ‘git_describe_format’,
    inlined from ‘assert_describe_workdir’ at tests/libgit2/describe/describe_helpers.c:38:2:
src/libgit2/describe.c:862:9: warning: ‘result’ may be used uninitialized [-Wmaybe-uninitialized]
  862 |         GIT_BUF_WRAP_PRIVATE(out, git_describe__format, result, given);
      |         ^
tests/libgit2/describe/describe_helpers.c: In function ‘assert_describe_workdir’:
tests/libgit2/describe/describe_helpers.c:35:30: note: ‘result’ was declared here
   35 |         git_describe_result *result;
      |                              ^
tests/libgit2/index/read_index.c: In function ‘test_index_read_index__handles_conflicts’:
tests/libgit2/index/read_index.c:199:9: warning: ‘conflict_iterator’ may be used uninitialized [-Wmaybe-uninitialized]
  199 |         cl_git_pass(git_index_conflict_next(
      |         ^
tests/libgit2/index/read_index.c:172:38: note: ‘conflict_iterator’ was declared here
  172 |         git_index_conflict_iterator *conflict_iterator;
      |                                      ^
tests/libgit2/index/tests.c: In function ‘test_index_tests__can_iterate’:
tests/libgit2/index/tests.c:1114:17: warning: ‘entry’ may be used uninitialized [-Wmaybe-uninitialized]
 1114 |                 cl_assert_equal_i(entry->file_size, test_entries[i].file_size);
      |                 ^
tests/libgit2/index/tests.c:1092:32: note: ‘entry’ was declared here
 1092 |         const git_index_entry *entry;
      |                                ^
tests/libgit2/apply/apply_helpers.c: In function ‘validate_workdir_unchanged’:
tests/libgit2/apply/apply_helpers.c:122:9: warning: ‘head’ may be used uninitialized [-Wmaybe-uninitialized]
  122 |         cl_git_pass(git_iterator_for_tree(&head_iterator, head, NULL));
      |         ^
tests/libgit2/apply/apply_helpers.c:112:19: note: ‘head’ was declared here
  112 |         git_tree *head;
      |                   ^
tests/libgit2/object/validate.c: In function ‘test_object_validate__cannot_parse_sha256_as_sha1’:
tests/libgit2/object/validate.c:75:9: warning: ‘valid’ may be used uninitialized [-Wmaybe-uninitialized]
   75 |         cl_assert_equal_i(0, valid);
      |         ^
tests/libgit2/object/validate.c:72:13: note: ‘valid’ was declared here
   72 |         int valid;
      |             ^
tests/libgit2/object/validate.c: In function ‘test_object_validate__invalid_sha1’:
tests/libgit2/object/validate.c:86:9: warning: ‘valid’ may be used uninitialized [-Wmaybe-uninitialized]
   86 |         cl_assert_equal_i(0, valid);
      |         ^
tests/libgit2/object/validate.c:83:13: note: ‘valid’ was declared here
   83 |         int valid;
      |             ^
tests/libgit2/index/conflicts.c: In function ‘test_index_conflicts__iterate’:
tests/libgit2/index/conflicts.c:224:9: warning: ‘iterator’ may be used uninitialized [-Wmaybe-uninitialized]
  224 |         cl_git_pass(git_index_conflict_next(&conflict_entry[0], &conflict_entry[1], &conflict_entry[2], iterator));
      |         ^
tests/libgit2/index/conflicts.c:218:38: note: ‘iterator’ was declared here
  218 |         git_index_conflict_iterator *iterator;
      |                                      ^
tests/libgit2/diff/workdir.c: In function ‘test_diff_workdir__larger_hunks’:
tests/libgit2/diff/workdir.c:1066:47: warning: ‘num_l’ may be used uninitialized [-Wmaybe-uninitialized]
 1066 |                                 for (l = 0; l < num_l; ++l) {
      |                                               ^
tests/libgit2/diff/workdir.c:1026:42: note: ‘num_l’ was declared here
 1026 |         size_t i, d, num_d, h, num_h, l, num_l;
      |                                          ^
tests/libgit2/win32/forbidden.c: In function ‘test_win32_forbidden__can_diff_tree_to_index’:
tests/libgit2/win32/forbidden.c:98:9: warning: ‘tree’ may be used uninitialized [-Wmaybe-uninitialized]
   98 |         cl_git_pass(git_diff_tree_to_index(&diff, repo, tree, NULL, NULL));
      |         ^
tests/libgit2/win32/forbidden.c:95:19: note: ‘tree’ was declared here
   95 |         git_tree *tree;
      |                   ^
tests/libgit2/win32/forbidden.c: In function ‘test_win32_forbidden__can_diff_tree_to_tree’:
tests/libgit2/win32/forbidden.c:110:9: warning: ‘tree’ may be used uninitialized [-Wmaybe-uninitialized]
  110 |         cl_git_pass(git_diff_tree_to_tree(&diff, repo, tree, tree, NULL));
      |         ^
tests/libgit2/win32/forbidden.c:107:19: note: ‘tree’ was declared here
  107 |         git_tree *tree;
      |                   ^
In function ‘git_object_free’,
    inlined from ‘git_commit_free’ at src/libgit2/object_api.c:33:2,
    inlined from ‘test_win32_forbidden__can_diff_index_to_workdir’ at tests/libgit2/win32/forbidden.c:134:2:
src/libgit2/object.c:290:12: warning: ‘tree’ may be used uninitialized [-Wmaybe-uninitialized]
  290 |         if (object == NULL)
      |            ^
tests/libgit2/win32/forbidden.c: In function ‘test_win32_forbidden__can_diff_index_to_workdir’:
tests/libgit2/win32/forbidden.c:121:19: note: ‘tree’ was declared here
  121 |         git_tree *tree;
      |                   ^
tests/libgit2/diff/workdir.c: In function ‘test_diff_workdir__cannot_diff_against_a_bare_repository’:
tests/libgit2/diff/workdir.c:1186:9: warning: ‘tree’ may be used uninitialized [-Wmaybe-uninitialized]
 1186 |         cl_assert_equal_i(
      |         ^
tests/libgit2/diff/workdir.c:1177:19: note: ‘tree’ was declared here
 1177 |         git_tree *tree;
      |                   ^
tests/libgit2/submodule/escape.c: In function ‘test_submodule_escape__from_gitdir’:
tests/libgit2/submodule/escape.c:62:9: warning: ‘sm_location’ may be used uninitialized [-Wmaybe-uninitialized]
   62 |         cl_assert_equal_i(GIT_SUBMODULE_STATUS_IN_INDEX | GIT_SUBMODULE_STATUS_IN_HEAD, sm_location);
      |         ^
tests/libgit2/submodule/escape.c:37:22: note: ‘sm_location’ declared here
   37 |         unsigned int sm_location;
      |                      ^
tests/libgit2/iterator/index.c: In function ‘test_iterator_index__range_icase’:
tests/libgit2/iterator/index.c:258:9: warning: ‘head’ may be used uninitialized [-Wmaybe-uninitialized]
  258 |         cl_git_pass(git_index_read_tree(index, head));
      |         ^
tests/libgit2/iterator/index.c:251:19: note: ‘head’ was declared here
  251 |         git_tree *head;
      |                   ^
tests/libgit2/submodule/escape.c: In function ‘test_submodule_escape__from_gitdir_windows’:
tests/libgit2/submodule/escape.c:96:9: warning: ‘sm_location’ may be used uninitialized [-Wmaybe-uninitialized]
   96 |         cl_assert_equal_i(GIT_SUBMODULE_STATUS_IN_INDEX | GIT_SUBMODULE_STATUS_IN_HEAD, sm_location);
      |         ^
tests/libgit2/submodule/escape.c:71:22: note: ‘sm_location’ declared here
   71 |         unsigned int sm_location;
      |                      ^
In function ‘git_odb_add_backend’,
    inlined from ‘test_odb_backend_mempack__initialize’ at tests/libgit2/odb/backend/mempack.c:18:2:
src/libgit2/odb.c:618:16: warning: ‘backend’ may be used uninitialized [-Wmaybe-uninitialized]
  618 |         return add_backend_internal(odb, backend, priority, false, 0);
      |                ^
tests/libgit2/odb/backend/mempack.c: In function ‘test_odb_backend_mempack__initialize’:
tests/libgit2/odb/backend/mempack.c:14:26: note: ‘backend’ was declared here
   14 |         git_odb_backend *backend;
      |                          ^
tests/libgit2/odb/backend/multiple.c: In function ‘test_odb_backend_multiple__initialize’:
tests/libgit2/odb/backend/multiple.c:33:22: warning: ‘backend’ may be used uninitialized [-Wmaybe-uninitialized]
   33 |         _fake_filled = (fake_backend *)backend;
      |                      ^
tests/libgit2/odb/backend/multiple.c:25:26: note: ‘backend’ was declared here
   25 |         git_odb_backend *backend;
      |                          ^
tests/libgit2/message/trailer.c: In function ‘assert_trailers’:
tests/libgit2/message/trailer.c:5:35: warning: ‘arr.trailers’ may be used uninitialized [-Wmaybe-uninitialized]
    5 |         git_message_trailer_array arr;
      |                                   ^
tests/libgit2/message/trailer.c:12:19: warning: ‘arr.count’ may be used uninitialized [-Wmaybe-uninitialized]
   12 |         for(i=0; i<arr.count; i++) {
      |                   ^
tests/libgit2/message/trailer.c:5:35: note: ‘arr.count’ was declared here
    5 |         git_message_trailer_array arr;
      |                                   ^
In function ‘git__free’,
    inlined from ‘git_message_trailer_array_free’ at src/libgit2/trailer.c:428:2,
    inlined from ‘assert_trailers’ at tests/libgit2/message/trailer.c:19:2:
src/util/alloc.h:39:9: warning: ‘arr._trailer_block’ may be used uninitialized [-Wmaybe-uninitialized]
   39 |         git__allocator.gfree(ptr);
      |         ^
tests/libgit2/message/trailer.c: In function ‘assert_trailers’:
tests/libgit2/message/trailer.c:5:35: note: ‘arr._trailer_block’ was declared here
    5 |         git_message_trailer_array arr;
      |                                   ^
In function ‘git_odb_add_backend’,
    inlined from ‘setup_backend’ at tests/libgit2/odb/backend/simple.c:19:2:
src/libgit2/odb.c:618:16: warning: ‘backend’ may be used uninitialized [-Wmaybe-uninitialized]
  618 |         return add_backend_internal(odb, backend, priority, false, 0);
      |                ^
tests/libgit2/odb/backend/simple.c: In function ‘setup_backend’:
tests/libgit2/odb/backend/simple.c:14:26: note: ‘backend’ was declared here
   14 |         git_odb_backend *backend;
      |                          ^
In function ‘git_submodule_owner’,
    inlined from ‘test_submodule_lookup__can_be_dupped’ at tests/libgit2/submodule/lookup.c:71:2:
src/libgit2/submodule.c:1063:25: warning: ‘sm_duplicate’ may be used uninitialized [-Wmaybe-uninitialized]
 1063 |         return submodule->repo;
      |                         ^
tests/libgit2/submodule/lookup.c: In function ‘test_submodule_lookup__can_be_dupped’:
tests/libgit2/submodule/lookup.c:49:24: note: ‘sm_duplicate’ was declared here
   49 |         git_submodule *sm_duplicate;
      |                        ^
In function ‘git_atomic__swap’,
    inlined from ‘set_refdb’ at src/libgit2/repository.c:114:15,
    inlined from ‘git_repository_set_refdb’ at src/libgit2/repository.c:1567:2,
    inlined from ‘test_odb_backend_nobackend__initialize’ at tests/libgit2/odb/backend/nobackend.c:21:2:
src/util/thread.h:184:9: warning: ‘refdb’ may be used uninitialized [-Wmaybe-uninitialized]
  184 |         __atomic_exchange(ptr, &newval, &foundval, __ATOMIC_SEQ_CST);
      |         ^
tests/libgit2/odb/backend/nobackend.c: In function ‘test_odb_backend_nobackend__initialize’:
tests/libgit2/odb/backend/nobackend.c:12:20: note: ‘refdb’ was declared here
   12 |         git_refdb *refdb;
      |                    ^
In function ‘git_fs_path_owner_is’,
    inlined from ‘validate_ownership_path’ at src/libgit2/repository.c:631:11,
    inlined from ‘validate_ownership’ at src/libgit2/repository.c:671:16,
    inlined from ‘git_repository_open_ext’ at src/libgit2/repository.c:1124:15:
src/util/fs_path.c:1990:45: warning: ‘sudo_uid’ may be used uninitialized [-Wmaybe-uninitialized]
 1990 |             sudo_uid_lookup(&sudo_uid) == 0 &&
      |                                             ^
src/util/fs_path.c: In function ‘git_repository_open_ext’:
src/util/fs_path.c:1959:21: note: ‘sudo_uid’ was declared here
 1959 |         uid_t euid, sudo_uid;
      |                     ^
tests/libgit2/worktree/worktree.c: In function ‘test_worktree_worktree__init’:
tests/libgit2/worktree/worktree.c:216:9: warning: ‘branch’ may be used uninitialized [-Wmaybe-uninitialized]
  216 |         git_reference_free(branch);
      |         ^
tests/libgit2/worktree/worktree.c:203:24: note: ‘branch’ declared here
  203 |         git_reference *branch;
      |                        ^
In function ‘git_iterator_for_workdir’,
    inlined from ‘test_iterator_workdir__bounded_submodules’ at tests/libgit2/iterator/workdir.c:1207:3:
src/libgit2/iterator.h:147:16: warning: ‘head’ may be used uninitialized [-Wmaybe-uninitialized]
  147 |         return git_iterator_for_workdir_ext(out, repo, NULL, index, tree, options);
      |                ^
tests/libgit2/iterator/workdir.c: In function ‘test_iterator_workdir__bounded_submodules’:
tests/libgit2/iterator/workdir.c:1187:19: note: ‘head’ was declared here
 1187 |         git_tree *head;
      |                   ^
In function ‘git_object_free’,
    inlined from ‘git_commit_free’ at src/libgit2/object_api.c:33:2,
    inlined from ‘test_checkout_index__initialize’ at tests/libgit2/checkout/index.c:23:2:
src/libgit2/object.c:290:12: warning: ‘tree’ may be used uninitialized [-Wmaybe-uninitialized]
  290 |         if (object == NULL)
      |            ^
tests/libgit2/checkout/index.c: In function ‘test_checkout_index__initialize’:
tests/libgit2/checkout/index.c:16:19: note: ‘tree’ was declared here
   16 |         git_tree *tree;
      |                   ^
In function ‘git_reference_iterator_new’,
    inlined from ‘test_refs_iterator__empty’ at tests/libgit2/refs/iterator.c:134:2:
src/libgit2/refs.c:752:13: warning: ‘empty’ may be used uninitialized [-Wmaybe-uninitialized]
  752 |         if (git_repository_refdb__weakptr(&refdb, repo) < 0)
      |             ^
tests/libgit2/refs/iterator.c: In function ‘test_refs_iterator__empty’:
tests/libgit2/refs/iterator.c:129:25: note: ‘empty’ was declared here
  129 |         git_repository *empty;
      |                         ^
In function ‘memcpy’,
    inlined from ‘git_oid_raw_cpy’ at src/libgit2/oid.h:202:2,
    inlined from ‘git_oid_cpy’ at src/libgit2/oid.c:240:9,
    inlined from ‘dup_reflog’ at src/libgit2/transaction.c:264:3,
    inlined from ‘git_transaction_set_reflog’ at src/libgit2/transaction.c:290:15,
    inlined from ‘git_stash_drop’ at src/libgit2/stash.c:1252:15:
/usr/include/bits/string_fortified.h:29:10: warning: ‘__builtin_memcpy’ reading 20 bytes from a region of size 0 [-Wstringop-overread]
   29 |   return __builtin___memcpy_chk (__dest, __src, __len,
      |          ^
In function ‘git_stash_drop’:
lto1: note: source object is likely at address zero
tests/libgit2/worktree/worktree.c: In function ‘test_worktree_worktree__add_locked’:
tests/libgit2/worktree/worktree.c:241:9: warning: ‘branch’ may be used uninitialized [-Wmaybe-uninitialized]
  241 |         git_reference_free(branch);
      |         ^
tests/libgit2/worktree/worktree.c:224:24: note: ‘branch’ declared here
  224 |         git_reference *branch;
      |                        ^
tests/libgit2/diff/index.c: In function ‘test_diff_index__to_index’:
tests/libgit2/diff/index.c:291:9: warning: ‘diff’ may be used uninitialized [-Wmaybe-uninitialized]
  291 |         cl_git_pass(git_diff_foreach(
      |         ^
tests/libgit2/diff/index.c:279:19: note: ‘diff’ was declared here
  279 |         git_diff *diff;
      |                   ^
In function ‘git_grafts_get’,
    inlined from ‘test_grafts_shallow__shallow_oids’ at tests/libgit2/grafts/shallow.c:55:2:
src/libgit2/grafts.c:241:21: warning: ‘grafts’ may be used uninitialized [-Wmaybe-uninitialized]
  241 |         if ((*out = git_oidmap_get(grafts->commits, oid)) == NULL)
      |                     ^
tests/libgit2/grafts/shallow.c: In function ‘test_grafts_shallow__shallow_oids’:
tests/libgit2/grafts/shallow.c:49:21: note: ‘grafts’ was declared here
   49 |         git_grafts *grafts;
      |                     ^
tests/libgit2/diff/submodules.c: In function ‘test_diff_submodules__dirty_submodule_2’:
tests/libgit2/diff/submodules.c:157:17: warning: ‘head’ may be used uninitialized [-Wmaybe-uninitialized]
  157 |                 cl_git_pass(git_diff_tree_to_index(&diff2, g_repo, head, NULL, &opts));
      |                 ^
tests/libgit2/diff/submodules.c:154:27: note: ‘head’ was declared here
  154 |                 git_tree *head;
      |                           ^
tests/libgit2/diff/submodules.c: In function ‘test_diff_submodules__submod2_head_to_index’:
tests/libgit2/diff/submodules.c:222:9: warning: ‘head’ may be used uninitialized [-Wmaybe-uninitialized]
  222 |         cl_git_pass(git_diff_tree_to_index(&diff, g_repo, head, NULL, &opts));
      |         ^
tests/libgit2/diff/submodules.c:207:19: note: ‘head’ was declared here
  207 |         git_tree *head;
      |                   ^
tests/libgit2/grafts/shallow.c: In function ‘test_grafts_shallow__errors_on_borked’:
tests/libgit2/grafts/shallow.c:94:9: warning: ‘grafts’ may be used uninitialized [-Wmaybe-uninitialized]
   94 |         cl_git_fail(git_grafts_refresh(grafts));
      |         ^
tests/libgit2/grafts/shallow.c:88:21: note: ‘grafts’ was declared here
   88 |         git_grafts *grafts;
      |                     ^
In function ‘git_grafts_get’,
    inlined from ‘test_grafts_shallow__cache_clearing’ at tests/libgit2/grafts/shallow.c:69:2:
src/libgit2/grafts.c:241:21: warning: ‘grafts’ may be used uninitialized [-Wmaybe-uninitialized]
  241 |         if ((*out = git_oidmap_get(grafts->commits, oid)) == NULL)
      |                     ^
tests/libgit2/grafts/shallow.c: In function ‘test_grafts_shallow__cache_clearing’:
tests/libgit2/grafts/shallow.c:61:21: note: ‘grafts’ was declared here
   61 |         git_grafts *grafts;
      |                     ^
In function ‘merge_preference’,
    inlined from ‘git_merge_analysis_for_ref’ at src/libgit2/merge.c:3265:15,
    inlined from ‘analysis_from_branch’ at tests/libgit2/merge/analysis.c:74:2:
src/libgit2/merge.c:3236:9: warning: ‘config’ may be used uninitialized [-Wmaybe-uninitialized]
 3236 |         git_config_free(config);
      |         ^
src/libgit2/merge.c: In function ‘analysis_from_branch’:
src/libgit2/merge.c:3209:21: note: ‘config’ declared here
 3209 |         git_config *config;
      |                     ^
In function ‘git_object_id’,
    inlined from ‘git_commit_id’ at src/libgit2/object_api.c:38:9,
    inlined from ‘test_graph_ahead_behind__returns_correct_result’ at tests/libgit2/graph/ahead_behind.c:43:2:
src/libgit2/object.c:298:9: warning: ‘other’ may be used uninitialized [-Wmaybe-uninitialized]
  298 |         GIT_ASSERT_ARG_WITH_RETVAL(obj, NULL);
      |         ^
tests/libgit2/graph/ahead_behind.c: In function ‘test_graph_ahead_behind__returns_correct_result’:
tests/libgit2/graph/ahead_behind.c:30:21: note: ‘other’ was declared here
   30 |         git_commit *other;
      |                     ^
tests/libgit2/diff/patch.c: In function ‘test_diff_patch__hunks_have_correct_line_numbers’:
tests/libgit2/diff/patch.c:288:9: warning: ‘head’ may be used uninitialized [-Wmaybe-uninitialized]
  288 |         cl_git_pass(git_diff_tree_to_workdir(&diff, g_repo, head, &opt));
      |         ^
tests/libgit2/diff/patch.c:262:19: note: ‘head’ was declared here
  262 |         git_tree *head;
      |                   ^
In function ‘git_config_next’,
    inlined from ‘test_config_read__iterator’ at tests/libgit2/config/read.c:366:16:
src/libgit2/config.c:1117:16: warning: ‘iter’ may be used uninitialized [-Wmaybe-uninitialized]
 1117 |         return iter->next(entry, iter);
      |                ^
tests/libgit2/config/read.c: In function ‘test_config_read__iterator’:
tests/libgit2/config/read.c:353:30: note: ‘iter’ was declared here
  353 |         git_config_iterator *iter;
      |                              ^
tests/libgit2/rebase/inmemory.c: In function ‘test_rebase_inmemory__can_resolve_conflicts’:
tests/libgit2/rebase/inmemory.c:91:9: warning: ‘rebase_index’ may be used uninitialized [-Wmaybe-uninitialized]
   91 |         cl_assert(git_index_has_conflicts(rebase_index));
      |         ^
tests/libgit2/rebase/inmemory.c:61:20: note: ‘rebase_index’ was declared here
   61 |         git_index *rebase_index, *repo_index;
      |                    ^
tests/libgit2/apply/apply_helpers.c: In function ‘validate_index_unchanged’:
tests/libgit2/apply/apply_helpers.c:95:9: warning: ‘head’ may be used uninitialized [-Wmaybe-uninitialized]
   95 |         cl_git_pass(git_iterator_for_tree(&head_iterator, head, NULL));
      |         ^
tests/libgit2/apply/apply_helpers.c:88:19: note: ‘head’ was declared here
   88 |         git_tree *head;
      |                   ^
In function ‘git_object_id’,
    inlined from ‘git_commit_id’ at src/libgit2/object_api.c:38:9,
    inlined from ‘test_graph_descendant_of__returns_correct_result’ at tests/libgit2/graph/descendant_of.c:34:2:
src/libgit2/object.c:298:9: warning: ‘other’ may be used uninitialized [-Wmaybe-uninitialized]
  298 |         GIT_ASSERT_ARG_WITH_RETVAL(obj, NULL);
      |         ^
tests/libgit2/graph/descendant_of.c: In function ‘test_graph_descendant_of__returns_correct_result’:
tests/libgit2/graph/descendant_of.c:27:21: note: ‘other’ was declared here
   27 |         git_commit *other;
      |                     ^
tests/libgit2/diff/tree.c: In function ‘test_diff_tree__larger_hunks’:
tests/libgit2/diff/tree.c:283:39: warning: ‘num_l’ may be used uninitialized [-Wmaybe-uninitialized]
  283 |                         for (l = 0; l < num_l; ++l) {
      |                                       ^
tests/libgit2/diff/tree.c:259:39: note: ‘num_l’ was declared here
  259 |         size_t d, num_d, h, num_h, l, num_l;
      |                                       ^
In function ‘git_regexp_match’,
    inlined from ‘git_config_backend_foreach_match’ at src/libgit2/config.c:532:17:
src/util/regexp.c:37:22: warning: ‘regex’ may be used uninitialized [-Wmaybe-uninitialized]
   37 |         if ((error = pcre_exec(*r, NULL, string, (int) strlen(string), 0, 0, NULL, 0)) < 0)
      |                      ^
src/libgit2/config.c: In function ‘git_config_backend_foreach_match’:
src/libgit2/config.c:516:20: note: ‘regex’ was declared here
  516 |         git_regexp regex;
      |                    ^