==============================================================================
These are likely internal to AIX (indicates that using "_" prefix in
user code is a bad idea)

_data
_edata
_end
_etext
_isfinite
_isnan
_isnanf
_isunordered
_libs_init_routine
_odm_init_routine
_restf14
_restf15
_restf3
_savef3
_text

==============================================================================
Misc

_current_thd           (sql/mysql_priv.h, used?!)
_downheap              (include/queues.h, mysys/queues.c)
_hash_init             (include/hash.h, mysys/hash.c, sql/mysql_priv.h)
_my_b_get              (include/my_sys.h, mysys/mf_iocache.c, sql/mysql_priv.h)
_my_bits_reverse_table (include/my_bit.h, mysys/my_bit.c)
_my_sig_remember       (mysys/mf_brkhant.c, mysys/my_static.c)
_my_signals            (mysys/mf_brkhant.c, mysys/my_static.c)
_my_thread_var         (include/my_pthread.h, sql/mysql_priv.h.pp)

==============================================================================
MyISAM

_create_index_by_sort
_ft_make_key
_mi_calc_blob_length
_mi_check_index
_mi_ck_real_write_btree
_mi_ck_write_btree
_mi_ck_write_tree
_mi_decrement_open_count
_mi_dispose
_mi_dpointer
_mi_dpos
_mi_enlarge_root
_mi_fetch_keypage
_mi_find_half_pos
_mi_ft_add
_mi_ft_cmp
_mi_ft_convert_to_ft2
_mi_ft_del
_mi_ft_parse
_mi_ft_parserecord
_mi_ft_segiterator
_mi_ft_segiterator_dummy_init
_mi_ft_segiterator_init
_mi_ft_update
_mi_get_block_info
_mi_get_key
_mi_get_last_key
_mi_insert
_mi_keylength
_mi_keylength_part
_mi_kpointer
_mi_kpos
_mi_make_key
_mi_mark_file_changed
_mi_memmap_file
_mi_move_key
_mi_new
_mi_pack_get_block_info
_mi_pack_key
_mi_pack_rec_unpack
_mi_print_key
_mi_read_cache
_mi_read_pack_info
_mi_readinfo
_mi_rec_check
_mi_rec_pack
_mi_rec_pos
_mi_rec_unpack
_mi_search
_mi_search_first
_mi_search_last
_mi_search_next
_mi_split_page
_mi_test_if_changed
_mi_unmap_file
_mi_write_keypage
_mi_write_part_record
_mi_writeinfo
_my_calc_total_blob_length
_my_store_blob_length
_myisam_log
_myisam_log_command
_myisam_log_record
_myrg_init_queue
_myrg_mi_read_record

==============================================================================
zlib (doesn't matter I suspect, as we use the API from the MySQL code)

_tr_align
_tr_flush_block
_tr_init
_tr_stored_block
_tr_tally

==============================================================================