Remove some unused variables

This patch removes some unused variables, found with -Wunused.  I have
not removed everything reported by -Wunused, because some expressions
such as

  struct type *arg_type = check_typedef (value_type);

in bfin-tdep.c could have an unexpected but important side-effect.  I
removed others that I considered more low-risk, such as:

  struct gdbarch *gdbarch = get_objfile_arch (objfile);

I tested building with Python 2/Python 3/no Python, with/without expat,
with/without libipt and with/without babeltrace.

gdb/ChangeLog:

	* ada-lang.c (ada_collect_symbol_completion_matches): Remove
	unused variables.
	(ada_is_redundant_range_encoding): Likewise.
	* ada-varobj.c (ada_varobj_get_value_of_array_variable):
	Likewise.
	* alpha-tdep.c (alpha_software_single_step): Likewise.
	* arm-tdep.c (_initialize_arm_tdep): Likewise.
	* auto-load.c (info_auto_load_cmd): Likewise.
	* break-catch-syscall.c (insert_catch_syscall): Likewise.
	(remove_catch_syscall): Likewise.
	* breakpoint.c (condition_completer): Likewise.
	(clear_command): Likewise.
	(update_breakpoint_locations): Likewise.
	* btrace.c (btrace_disable): Likewise.
	(btrace_teardown): Likewise.
	(btrace_maint_update_pt_packets): Likewise.
	(maint_btrace_clear_cmd): Likewise.
	* cli/cli-decode.c (lookup_cmd_1): Likewise.
	(lookup_cmd_composition): Likewise.
	* cli/cli-dump.c (scan_filename): Likewise.
	(restore_command): Likewise.
	* compile/compile-loc2c.c (compute_stack_depth): Likewise.
	* compile/compile-object-load.c (compile_object_load): Likewise.
	* compile/compile-object-run.c (compile_object_run): Likewise.
	* compile/compile.c (compile_to_object): Likewise.
	* completer.c (filename_completer): Likewise.
	(complete_files_symbols): Likewise.
	(complete_expression): Likewise.
	* corelow.c (core_open): Likewise.
	* ctf.c (ctf_start): Likewise.
	(ctf_write_status): Likewise.
	(ctf_write_uploaded_tsv): Likewise.
	(ctf_write_definition_end): Likewise.
	(ctf_open_dir): Likewise.
	(ctf_xfer_partial): Likewise.
	(ctf_trace_find): Likewise.
	* disasm.c (gdb_pretty_print_disassembler::pretty_print_insn):
	Likewise.
	* dwarf2loc.c (allocate_piece_closure): Likewise.
	(indirect_pieced_value): Likewise.
	(dwarf2_evaluate_loc_desc_full): Likewise.
	* dwarf2read.c (dw2_expand_marked_cus): Likewise.
	(dw2_expand_symtabs_matching): Likewise.
	(dw2_map_symbol_filenames): Likewise.
	(read_and_check_comp_unit_head): Likewise.
	(read_cutu_die_from_dwo): Likewise.
	(lookup_dwo_unit): Likewise.
	(read_comp_units_from_section): Likewise.
	(dwarf2_compute_name): Likewise.
	(handle_DW_AT_stmt_list): Likewise.
	(create_cus_hash_table): Likewise.
	(create_dwp_v2_section): Likewise.
	(dwarf2_rnglists_process): Likewise.
	(dwarf2_ranges_process): Likewise.
	(dwarf2_record_block_ranges): Likewise.
	(is_vtable_name): Likewise.
	(read_formatted_entries): Likewise.
	(skip_form_bytes): Likewise.
	* elfread.c (elf_symtab_read): Likewise.
	* exec.c (exec_file_command): Likewise.
	* f-valprint.c (f_val_print): Likewise.
	(info_common_command_for_block): Likewise.
	* guile/guile.c (initialize_scheme_side): Likewise.
	* guile/scm-breakpoint.c (gdbscm_breakpoint_commands): Likewise.
	* guile/scm-cmd.c (cmdscm_completer): Likewise.
	(gdbscm_register_command_x): Likewise.
	* guile/scm-frame.c (gdbscm_frame_read_var): Likewise.
	* guile/scm-param.c (gdbscm_parameter_value): Likewise.
	* guile/scm-ports.c (file_port_magic): Likewise.
	* guile/scm-pretty-print.c (ppscm_search_pp_list): Likewise.
	(ppscm_pretty_print_one_value): Likewise.
	(ppscm_print_children): Likewise.
	* guile/scm-string.c (gdbscm_string_to_argv): Likewise.
	* guile/scm-symtab.c (gdbscm_sal_symtab): Likewise.
	* guile/scm-type.c (gdbscm_type_next_field_x): Likewise.
	* guile/scm-utils.c (gdbscm_parse_function_args): Likewise.
	* i386-tdep.c (i386_register_reggroup_p): Likewise.
	* infcmd.c (run_command_1): Likewise.
	(until_next_fsm_clean_up): Likewise.
	* linespec.c (linespec_complete): Likewise.
	(find_label_symbols): Likewise.
	* m2-valprint.c (m2_val_print): Likewise.
	* memattr.c (require_user_regions): Likewise.
	(lookup_mem_region): Likewise.
	(disable_mem_command): Likewise.
	(mem_delete): Likewise.
	* mep-tdep.c (mep_register_name): Likewise.
	(mep_analyze_prologue): Likewise.
	* mi/mi-cmd-file.c (mi_cmd_file_list_shared_libraries): Likewise.
	* mi/mi-interp.c (mi_on_sync_execution_done): Likewise.
	* mi/mi-main.c (mi_cmd_trace_frame_collected): Likewise.
	* microblaze-linux-tdep.c (microblaze_linux_init_abi): Likewise.
	* minidebug.c (lzma_open): Likewise.
	* minsyms.c (lookup_minimal_symbol): Likewise.
	* mips-linux-tdep.c (mips64_fill_fpregset): Likewise.
	* mips-tdep.c (mips_stub_frame_sniffer): Likewise.
	(mips_o64_return_value): Likewise.
	(mips_single_step_through_delay): Likewise.
	(_initialize_mips_tdep): Likewise.
	* nios2-tdep.c (nios2_push_dummy_call): Likewise.
	(nios2_software_single_step): Likewise.
	* parse.c (find_minsym_type_and_address): Likewise.
	* psymtab.c (psym_relocate): Likewise.
	* python/py-breakpoint.c (bppy_get_commands): Likewise.
	(gdbpy_breakpoint_modified): Likewise.
	* python/py-infevents.c (create_inferior_call_event_object):
	Likewise.
	* python/py-record-btrace.c (btpy_list_item): Likewise.
	* python/py-type.c (typy_str): Likewise.
	* python/py-value.c (valpy_call): Likewise.
	* python/python.c (do_start_initialization): Likewise.
	* record-btrace.c (record_btrace_insn_history_range): Likewise.
	(record_btrace_call_history_range): Likewise.
	(record_btrace_record_method): Likewise.
	(record_btrace_xfer_partial): Likewise.
	(btrace_get_frame_function): Likewise.
	* record-full.c (record_full_open): Likewise.
	* record.c (get_context_size): Likewise.
	* registry.h (DEFINE_REGISTRY): Likewise.
	* remote-fileio.c (remote_fileio_request): Likewise.
	* remote.c (remote_update_thread_list): Likewise.
	(remote_check_symbols): Likewise.
	(remote_commit_resume): Likewise.
	(remote_interrupt): Likewise.
	(remote_insert_breakpoint): Likewise.
	(compare_sections_command): Likewise.
	* rust-exp.y (super_name): Likewise.
	(lex_string): Likewise.
	(convert_ast_to_type): Likewise.
	(convert_ast_to_expression): Likewise.
	* rust-lang.c (rust_print_struct_def): Likewise.
	(rust_print_type): Likewise.
	(rust_evaluate_subexp): Likewise.
	* rx-tdep.c (rx_register_type): Likewise.
	* ser-event.c (serial_event_clear): Likewise.
	* serial.c (serial_open): Likewise.
	* spu-tdep.c (spu_overlay_new_objfile): Likewise.
	* symfile.c (section_is_overlay): Likewise.
	(overlay_unmapped_address): Likewise.
	(overlay_mapped_address): Likewise.
	(simple_overlay_update_1): Likewise.
	(simple_overlay_update): Likewise.
	* symtab.c (symbol_find_demangled_name): Likewise.
	(search_symbols): Likewise.
	* target-descriptions.c (tdesc_predefined_type): Likewise.
	* target.c (target_commit_resume): Likewise.
	* thread.c (print_selected_thread_frame): Likewise.
	* top.c (new_ui_command): Likewise.
	(gdb_readline_no_editing): Likewise.
	* tracefile-tfile.c (tfile_open): Likewise.
	* tracepoint.c (create_tsv_from_upload): Likewise.
	* utils.c (quit): Likewise.
	(defaulted_query): Likewise.
	* valarith.c (value_concat): Likewise.
	* xml-syscall.c (xml_list_syscalls_by_group): Likewise.
	* xml-tdesc.c (target_fetch_description_xml): Likewise.
	* xtensa-tdep.c (xtensa_pseudo_register_read): Likewise.
	(xtensa_pseudo_register_write): Likewise.

gdb/gdbserver/ChangeLog:

	* regcache.c (registers_to_string): Remove unused variable.

1 files changed, 0 insertions, 16 deletions

diff --git a/gdb/ctf.c b/gdb/ctf.c
index 35cf78c..e9bd6fe 100644
--- a/gdb/ctf.c
+++ b/gdb/ctf.c
@@ -313,7 +313,6 @@ ctf_start (struct trace_file_writer *self, const char *dirname)
 {
   struct ctf_trace_file_writer *writer
     = (struct ctf_trace_file_writer *) self;
-  int i;
   mode_t hmode = S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IXGRP | S_IROTH;
 
   /* Create DIRNAME.  */
@@ -453,7 +452,6 @@ ctf_write_status (struct trace_file_writer *self,
   struct ctf_trace_file_writer *writer
     = (struct ctf_trace_file_writer *) self;
   uint32_t id;
-  int32_t int32;
 
   ctf_save_write_metadata (&writer->tcs, "\n");
   ctf_save_write_metadata (&writer->tcs,
@@ -496,7 +494,6 @@ ctf_write_uploaded_tsv (struct trace_file_writer *self,
     = (struct ctf_trace_file_writer *) self;
   int32_t int32;
   int64_t int64;
-  unsigned int len;
   const gdb_byte zero = 0;
 
   /* Event Id.  */
@@ -618,9 +615,6 @@ ctf_write_tdesc (struct trace_file_writer *self)
 static void
 ctf_write_definition_end (struct trace_file_writer *self)
 {
-  struct ctf_trace_file_writer *writer
-    = (struct ctf_trace_file_writer *) self;
-
   self->ops->frame_ops->end (self);
 }
 
@@ -859,7 +853,6 @@ static void
 ctf_open_dir (const char *dirname)
 {
   struct bt_iter_pos begin_pos;
-  struct bt_iter_pos *pos;
   unsigned int count, i;
   struct bt_ctf_event_decl * const *list;
 
@@ -889,7 +882,6 @@ ctf_open_dir (const char *dirname)
   for (i = 0; i < count; i++)
     if (strcmp ("register", bt_ctf_get_decl_event_name (list[i])) == 0)
       {
-	unsigned int j;
 	const struct bt_ctf_field_decl * const *field_list;
 	const struct bt_declaration *decl;
 
@@ -1284,7 +1276,6 @@ ctf_xfer_partial (struct target_ops *ops, enum target_object object,
   if (get_traceframe_number () != -1)
     {
       struct bt_iter_pos *pos;
-      int i = 0;
       enum target_xfer_status res;
       /* Records the lowest available address of all blocks that
 	 intersects the requested range.  */
@@ -1302,8 +1293,6 @@ ctf_xfer_partial (struct target_ops *ops, enum target_object object,
 	  ULONGEST amt;
 	  uint64_t maddr;
 	  uint16_t mlen;
-	  enum bfd_endian byte_order
-	    = gdbarch_byte_order (target_gdbarch ());
 	  const struct bt_definition *scope;
 	  const struct bt_definition *def;
 	  struct bt_ctf_event *event
@@ -1336,8 +1325,6 @@ ctf_xfer_partial (struct target_ops *ops, enum target_object object,
 	    {
 	      const struct bt_definition *array
 		= bt_ctf_get_field (event, scope, "contents");
-	      const struct bt_declaration *decl
-		= bt_ctf_get_decl_from_def (array);
 	      gdb_byte *contents;
 	      int k;
 
@@ -1534,10 +1521,8 @@ static int
 ctf_trace_find (struct target_ops *self, enum trace_find_type type, int num,
 		CORE_ADDR addr1, CORE_ADDR addr2, int *tpp)
 {
-  int ret = -1;
   int tfnum = 0;
   int found = 0;
-  struct bt_iter_pos pos;
 
   if (num == -1)
     {
@@ -1552,7 +1537,6 @@ ctf_trace_find (struct target_ops *self, enum trace_find_type type, int num,
 
   while (1)
     {
-      int id;
       struct bt_ctf_event *event;
       const char *name;