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.

11 files changed, 5 insertions, 18 deletions

diff --git a/gdb/guile/guile.c b/gdb/guile/guile.c
index bc3c45f..af1f9ae 100644
--- a/gdb/guile/guile.c
+++ b/gdb/guile/guile.c
@@ -605,7 +605,6 @@ static void
 initialize_scheme_side (void)
 {
   char *boot_scm_path;
-  char *msg;
 
   guile_datadir = concat (gdb_datadir, SLASH_STRING, "guile", (char *) NULL);
   boot_scm_path = concat (guile_datadir, SLASH_STRING, "gdb",
diff --git a/gdb/guile/scm-breakpoint.c b/gdb/guile/scm-breakpoint.c
index f84815e..c2d5c77 100644
--- a/gdb/guile/scm-breakpoint.c
+++ b/gdb/guile/scm-breakpoint.c
@@ -975,7 +975,6 @@ gdbscm_breakpoint_commands (SCM self)
   breakpoint_smob *bp_smob
     = bpscm_get_valid_breakpoint_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME);
   struct breakpoint *bp;
-  long length;
   SCM result;
 
   bp = bp_smob->bp;
diff --git a/gdb/guile/scm-cmd.c b/gdb/guile/scm-cmd.c
index 4745def..bcc7462 100644
--- a/gdb/guile/scm-cmd.c
+++ b/gdb/guile/scm-cmd.c
@@ -385,7 +385,7 @@ cmdscm_completer (struct cmd_list_element *command,
 {
   command_smob *c_smob/*obj*/ = (command_smob *) get_cmd_context (command);
   SCM completer_result_scm;
-  SCM text_scm, word_scm, result_scm;
+  SCM text_scm, word_scm;
 
   gdb_assert (c_smob != NULL);
   gdb_assert (gdbscm_is_procedure (c_smob->complete));
@@ -746,7 +746,7 @@ gdbscm_register_command_x (SCM self)
 {
   command_smob *c_smob
     = cmdscm_get_command_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME);
-  char *cmd_name, *pfx_name;
+  char *cmd_name;
   struct cmd_list_element **cmd_list;
   struct cmd_list_element *cmd = NULL;
 
diff --git a/gdb/guile/scm-frame.c b/gdb/guile/scm-frame.c
index 594d16e..fd5a60e 100644
--- a/gdb/guile/scm-frame.c
+++ b/gdb/guile/scm-frame.c
@@ -840,7 +840,6 @@ static SCM
 gdbscm_frame_read_var (SCM self, SCM symbol_scm, SCM rest)
 {
   SCM keywords[] = { block_keyword, SCM_BOOL_F };
-  int rc;
   frame_smob *f_smob;
   int block_arg_pos = -1;
   SCM block_scm = SCM_UNDEFINED;
diff --git a/gdb/guile/scm-param.c b/gdb/guile/scm-param.c
index 9478778..79b5bb4 100644
--- a/gdb/guile/scm-param.c
+++ b/gdb/guile/scm-param.c
@@ -1062,7 +1062,6 @@ gdbscm_parameter_value (SCM self)
       char *name;
       SCM except_scm;
       struct cmd_list_element *alias, *prefix, *cmd;
-      const char *arg;
       char *newarg;
       int found = -1;
       struct gdb_exception except = exception_none;
diff --git a/gdb/guile/scm-ports.c b/gdb/guile/scm-ports.c
index a7c0bd4..340f505 100644
--- a/gdb/guile/scm-ports.c
+++ b/gdb/guile/scm-ports.c
@@ -98,10 +98,6 @@ static SCM input_port_scm;
 static SCM output_port_scm;
 static SCM error_port_scm;
 
-/* Magic number to identify port ui-files.
-   Actually, the address of this variable is the magic number.  */
-static int file_port_magic;
-
 /* Internal enum for specifying output port.  */
 enum oport { GDB_STDOUT, GDB_STDERR };
 
diff --git a/gdb/guile/scm-pretty-print.c b/gdb/guile/scm-pretty-print.c
index a28e4e6..45edcf1 100644
--- a/gdb/guile/scm-pretty-print.c
+++ b/gdb/guile/scm-pretty-print.c
@@ -381,7 +381,6 @@ ppscm_search_pp_list (SCM list, SCM value)
       SCM matcher = scm_car (list);
       SCM worker;
       pretty_printer_smob *pp_smob;
-      int rc;
 
       if (!ppscm_is_pretty_printer (matcher))
 	{
@@ -534,7 +533,6 @@ ppscm_pretty_print_one_value (SCM printer, struct value **out_value,
   *out_value = NULL;
   TRY
     {
-      int rc;
       pretty_printer_worker_smob *w_smob
 	= (pretty_printer_worker_smob *) SCM_SMOB_DATA (printer);
 
@@ -744,7 +742,7 @@ ppscm_print_children (SCM printer, enum display_hint hint,
     = (pretty_printer_worker_smob *) SCM_SMOB_DATA (printer);
   int is_map, is_array, done_flag, pretty;
   unsigned int i;
-  SCM children, status;
+  SCM children;
   SCM iter = SCM_BOOL_F; /* -Wall */
   struct cleanup *cleanups;
 
@@ -799,7 +797,6 @@ ppscm_print_children (SCM printer, enum display_hint hint,
   done_flag = 0;
   for (i = 0; i < options->print_max; ++i)
     {
-      int rc;
       SCM scm_name, v_scm;
       char *name;
       SCM item = itscm_safe_call_next_x (iter, gdbscm_memory_error_p);
diff --git a/gdb/guile/scm-string.c b/gdb/guile/scm-string.c
index 4e495eb..5adac4e 100644
--- a/gdb/guile/scm-string.c
+++ b/gdb/guile/scm-string.c
@@ -241,7 +241,6 @@ static SCM
 gdbscm_string_to_argv (SCM string_scm)
 {
   char *string;
-  int i;
   SCM result = SCM_EOL;
 
   gdbscm_parse_function_args (FUNC_NAME, SCM_ARG1, NULL, "s",
diff --git a/gdb/guile/scm-symtab.c b/gdb/guile/scm-symtab.c
index 755ea67..e5278a7 100644
--- a/gdb/guile/scm-symtab.c
+++ b/gdb/guile/scm-symtab.c
@@ -578,7 +578,6 @@ static SCM
 gdbscm_sal_symtab (SCM self)
 {
   sal_smob *s_smob = stscm_get_valid_sal_smob_arg (self, SCM_ARG1, FUNC_NAME);
-  const struct symtab_and_line *sal = &s_smob->sal;
 
   return s_smob->symtab_scm;
 }
diff --git a/gdb/guile/scm-type.c b/gdb/guile/scm-type.c
index 704be88..922351d 100644
--- a/gdb/guile/scm-type.c
+++ b/gdb/guile/scm-type.c
@@ -1090,7 +1090,7 @@ gdbscm_type_next_field_x (SCM self)
   type_smob *t_smob;
   struct type *type;
   SCM it_scm, result, progress, object;
-  int field, rc;
+  int field;
 
   it_scm = itscm_get_iterator_arg_unsafe (self, SCM_ARG1, FUNC_NAME);
   i_smob = (iterator_smob *) SCM_SMOB_DATA (it_scm);
diff --git a/gdb/guile/scm-utils.c b/gdb/guile/scm-utils.c
index b7c955d..c0557dd 100644
--- a/gdb/guile/scm-utils.c
+++ b/gdb/guile/scm-utils.c
@@ -381,7 +381,7 @@ gdbscm_parse_function_args (const char *func_name,
 {
   va_list args;
   const char *p;
-  int i, have_rest, num_keywords, length, position;
+  int i, have_rest, num_keywords, position;
   int have_optional = 0;
   SCM status;
   SCM rest = SCM_EOL;