Better than spamming #svn-dev, here's the current list of 64-32bit narrowing warnings I get on my 64-bit mac wit Xcode 4.3.3's gcc. Taking a quick look at these, every case appears to be a valid warning that needs to be looked at and verified that the narrowing doesn't affect the value.
i don't know why these warnings don't show up on Linux and/or with newer versions of GCC. -- Brane subversion/libsvn_subr/adler32.c: In function 'svn__adler32': subversion/libsvn_subr/adler32.c:64: warning: implicit conversion shortens 64-bit value into a 32-bit value subversion/libsvn_subr/cache-membuffer.c: In function 'svn_cache__membuffer_cache_create': subversion/libsvn_subr/cache-membuffer.c:1078: warning: implicit conversion shortens 64-bit value into a 32-bit value subversion/libsvn_subr/gpg_agent.c: In function 'receive_from_gpg_agent': subversion/libsvn_subr/gpg_agent.c:117: warning: implicit conversion shortens 64-bit value into a 32-bit value subversion/libsvn_subr/string.c: In function 'svn__ui64toa': subversion/libsvn_subr/string.c:979: warning: implicit conversion shortens 64-bit value into a 32-bit value subversion/libsvn_subr/string.c:1010: warning: function returns address of local variable subversion/libsvn_fs_base/bdb/strings-table.c: In function 'svn_fs_bdb__string_read': subversion/libsvn_fs_base/bdb/strings-table.c:239: warning: implicit conversion shortens 64-bit value into a 32-bit value subversion/libsvn_fs_base/bdb/strings-table.c:241: warning: implicit conversion shortens 64-bit value into a 32-bit value subversion/libsvn_fs_base/key-gen.c: In function 'svn_fs_base__next_key': subversion/libsvn_fs_base/key-gen.c:42: warning: implicit conversion shortens 64-bit value into a 32-bit value subversion/libsvn_fs_base/key-gen.c:55: warning: implicit conversion shortens 64-bit value into a 32-bit value subversion/libsvn_fs_base/key-gen.c: In function 'svn_fs_base__key_compare': subversion/libsvn_fs_base/key-gen.c:108: warning: implicit conversion shortens 64-bit value into a 32-bit value subversion/libsvn_fs_base/key-gen.c:109: warning: implicit conversion shortens 64-bit value into a 32-bit value subversion/libsvn_ra_svn/cyrus_auth.c: In function 'sasl_read_cb': subversion/libsvn_ra_svn/cyrus_auth.c:646: warning: implicit conversion shortens 64-bit value into a 32-bit value subversion/libsvn_ra_svn/cyrus_auth.c: In function 'svn_ra_svn__do_cyrus_auth': subversion/libsvn_ra_svn/cyrus_auth.c:874: warning: assignment from incompatible pointer type subversion/libsvn_ra_svn/cyrus_auth.c:879: warning: assignment from incompatible pointer type subversion/libsvn_wc/old-and-busted.c: In function 'opt_revision_to_string': subversion/libsvn_wc/old-and-busted.c:385: warning: implicit conversion shortens 64-bit value into a 32-bit value subversion/libsvn_ra_serf/replay.c: In function 'svn_ra_serf__replay_range': subversion/libsvn_ra_serf/replay.c:857: warning: implicit conversion shortens 64-bit value into a 32-bit value subversion/libsvn_ra_serf/util.c: In function 'svn_ra_serf__context_run_wait': subversion/libsvn_ra_serf/util.c:724: warning: implicit conversion shortens 64-bit value into a 32-bit value subversion/libsvn_ra_serf/update.c: In function 'finish_report': subversion/libsvn_ra_serf/update.c:2419: warning: implicit conversion shortens 64-bit value into a 32-bit value subversion/svnserve/cyrus_auth.c: In function 'canonicalize_username': subversion/svnserve/cyrus_auth.c:64: warning: implicit conversion shortens 64-bit value into a 32-bit value subversion/svnserve/cyrus_auth.c: At top level: subversion/svnserve/cyrus_auth.c:101: warning: initialization from incompatible pointer type subversion/svnserve/cyrus_auth.c: In function 'try_auth': subversion/svnserve/cyrus_auth.c:188: warning: implicit conversion shortens 64-bit value into a 32-bit value subversion/svnserve/cyrus_auth.c:212: warning: implicit conversion shortens 64-bit value into a 32-bit value subversion/tests/svn_test_main.c: In function 'svn_test_rand': subversion/tests/svn_test_main.c:167: warning: implicit conversion shortens 64-bit value into a 32-bit value subversion/tests/libsvn_repos/repos-test.c: In function 'get_logs': subversion/tests/libsvn_repos/repos-test.c:2381: warning: implicit conversion shortens 64-bit value into a 32-bit value subversion/mod_dav_svn/liveprops.c: In function 'insert_prop_internal': subversion/mod_dav_svn/liveprops.c:766: warning: implicit conversion shortens 64-bit value into a 32-bit value
