Gerhard Häring schrieb: > Apparently at least gcc on Linux exports all symbols by default that are > not static.
Correct. Various factors influence run-time symbol binding, though. > This creates problems with Python extensions that export > symbols that are also used in other contexts. For example some people use > Python and the sqlite3 module under Apache, and the sqlite3 module exports > a symbol cache_init, but cache_init is also used by Apache's mod_cache > module. Thus there are crashes when using the sqlite3 module that only > occur in the mod_python context. > > Can somebody with more knowledge about C tell me how to fix the sqlite3 > module or compiler settings for distutils so that this does not happen? The only reliable way is to do renaming. This was one of the primary reasons of the "grand renaming" in Python, where the Py prefix was introduced. > Of course this only happens because the sqlite3 module is distributed among > multiple .c files and thus I couldn't make everything "static". In the specific case, I can't understand that reason. cache_init is declared in cache.c, and only used in cache.c (to fill a tp_init slot). So just make the symbol static. As a lesson learned, you should go through the module and make all functions static, then see what functions really need to be extern. You should then rename these functions, say by adding a PySQLite prefix. All dynamic symbols remaining should then either have the PySQLite prefix, except for init_sqlite3. In fact, since most operations in Python go through function pointers, there is typically very little need for extern functions in a Python extension module, even if that module consists of multiple C files. Regards, Martin P.S. Currently, on my system, the following symbols are extern in this module 00005890 T _authorizer_callback 0000dec0 A __bss_start 00007600 T _build_column_name 00005df0 T _build_py_params 00007ee0 T build_row_cast_map 00004880 T cache_dealloc 00004990 T cache_display 00004b90 T cache_get 00004da0 T cache_init 00004930 T cache_setup_types 0000d4a0 D CacheType 00004e80 T check_connection 00009f60 T check_remaining_sql 00005420 T check_thread 00006430 T _connection_begin 00005cb0 T connection_call 000068d0 T connection_close 000061c0 T connection_commit 000059b0 T connection_create_aggregate 00005ab0 T connection_create_function 000057a0 T connection_cursor 00006530 T connection_dealloc 00005320 T connection_execute 00005220 T connection_executemany 00005120 T connection_executescript 00006970 T connection_init 00006700 T connection_rollback 000056d0 T connection_set_authorizer 000050e0 T connection_setup_types 0000d5e0 D ConnectionType 0000ded8 B converters 000094d0 T converters_init 00007110 T cursor_close 00007190 T cursor_dealloc 00008d90 T cursor_execute 00008d50 T cursor_executemany 000072e0 T cursor_executescript 00007c90 T cursor_fetchall 00007d30 T cursor_fetchmany 00007e10 T cursor_fetchone 000070b0 T cursor_getiter 00007530 T cursor_init 00007b50 T cursor_iternext 000070e0 T cursor_setup_types 0000d980 D CursorType 0000decc B DatabaseError 0000ded4 B DataError 00005bb0 T _drop_unused_statement_references 0000dec0 A _edata 0000def0 B _enable_callback_tracebacks 0000defc A _end 0000dee8 B Error 00007710 T _fetch_one_row 00006cb0 T _final_callback 0000aac4 T _fini 00006830 T flush_statement_cache 00006fa0 T _func_callback 00007e60 T _get_converter 00003bd4 T _init 00009520 T init_sqlite3 0000deec B IntegrityError 0000ded0 B InterfaceError 0000dedc B InternalError 00008dd0 T microprotocols_adapt 00009040 T microprotocols_add 000090e0 T microprotocols_init 000047a0 T new_node 00004810 T node_dealloc 0000d3e0 D NodeType 0000def8 B NotSupportedError 0000dee4 B OperationalError 0000dee0 B OptimizedUnicode 00009ae0 T prepare_protocol_dealloc 00009ac0 T prepare_protocol_init 00009b10 T prepare_protocol_setup_types 0000dec8 B ProgrammingError 0000dec4 B psyco_adapters 00008fc0 T psyco_microprotocols_adapt 000070c0 T pysqlite_noop 00008110 T _query_execute 00006690 T reset_all_statements 0000dd20 D row_as_mapping 00009b50 T row_dealloc 00009e40 T row_init 00009bd0 T row_length 00009c40 T row_setup_types 00009c80 T row_subscript 0000dd40 D RowType 0000a910 T _seterror 00005fc0 T _set_result 00006c70 T _sqlite3_result_error 0000dc60 D SQLitePrepareProtocolType 0000aa30 T _sqlite_step_with_busyhandler 0000a2a0 T statement_bind_parameter 0000a530 T statement_bind_parameters 0000a7f0 T statement_create 0000a0f0 T statement_dealloc 0000a080 T statement_finalize 00009f30 T statement_mark_dirty 0000a210 T statement_recompile 0000a190 T statement_reset 0000a040 T statement_setup_types 0000de00 D StatementType 000076a0 T unicode_from_string 0000def4 B Warning _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
