------- Comment #1 from amylaar at gcc dot gnu dot org 2010-06-08 00:17 -------
Using C linkage for all of gcc-plugin.h is straightforward, and we it also
makes sense to put some popular other symbols there, e.g. warning.
However, there is a limit what we can reasonably put into C linkage without
restricting the C++ features that we can use overall (i.e. overload is
impossible if everything has C linkage).
E.g. the ICI plugin uses:
[amyl...@laria ici]$ nm ici.so|grep '\<U\>'|grep -v @@GLIBC_2
U aggregate_value_p
U all_lowering_passes
U all_lto_gen_passes
U all_passes
U all_regular_ipa_passes
U all_small_ipa_passes
U build3_stat
U build_fn_decl
U build_function_call_expr
U build_function_type
U build_int_cst
U build_optimization_node
U cfun
U cgraph_create_edge
U cgraph_create_virtual_clone
U cgraph_function_body_availability
U cgraph_mark_needed_node
U cgraph_node
U cgraph_nodes
U cl_optimization_restore
U cl_optimization_save
U cl_options
U cl_options_count
U compiler_params
U create_artificial_label
U create_basic_block
U create_tmp_var
U current_function_decl
U current_function_name
U current_pass
U decode_options
U dlerror
U dlopen
U dlsym
U do_per_function_toporder
U execute_ipa_pass_list
U execute_ipa_summary_passes
U execute_one_pass
U execute_pass_list
U expand_location
U fancy_abort
U find_opt
U flag_asynchronous_unwind_tables
U flag_omit_frame_pointer
U flag_pcc_struct_return
U flag_strict_aliasing
U flags_from_decl_or_type
U gen_rtx_fmt_s00_stat
U get_event_last
U get_identifier
U get_named_event_id
U get_num_compiler_params
U get_option_state
U gimple_build_call_from_tree
U gimple_build_label
U gimple_build_return
U gimple_build_switch_vec
U gimple_check_failed
U gimple_ops_offset_
U gimple_set_modified
U gimplify_stmt
U global_trees
U gsi_insert_after
U gsi_insert_before
U gsi_insert_seq_after
U gsi_insert_seq_before
U gss_for_code_
U htab_create_alloc
U htab_elements
U htab_find
U htab_find_slot
U htab_hash_string
U htab_remove_elt
U htab_traverse_noresize
U integer_types
U internal_error
U invoke_plugin_callbacks
U is_gimple_operand
U is_gimple_reg_type
U main_input_filename
U make_decl_rtl
U make_edge
U nreverse
U pass_early_local_passes
U pass_fini_dump_file
U pass_init_dump_file
U passes_by_id
U passes_by_id_size
U plugin_event_name
U quiet_flag
U register_callback
U remove_edge
U replace_equiv_address_nv
U set_cfun
U set_decl_rtl
U sort_case_labels
U split_block
U tree_check_failed
U tree_class_check_failed
U tree_code_length
U tree_code_type
U tree_cons_stat
U tree_contains_struct
U tree_contains_struct_check_failed
U tree_operand_check_failed
U unregister_callback
U update_stmt_operands
U vec_assert_fail
U vec_heap_p_reserve
U vec_heap_p_reserve_exact
U xcalloc
U xmalloc
Thus, for plugins that use some internal symbols with (potential?) C++
name-mangling, we want a way to use a compiler that produces DSOs that
are compatible with the gcc compiler binary, inasmuch as that is feasible.
Likewise, PR 42843 still remains relevant because some of the tests use
somewhat uncommon symbols, e.g. cgraph_build_static_cdtor in
finish_unit_plugin.c .
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44459
