Apply 'const' in more places

Many global arrays in gdb could be marked "const" but are not.  This
patch changes some of them.  (There may be other arrays that could
benefit from this treatment.  I only examined arrays of strings.)

This lets the linker move some symbols to the readonly data section.
For example, previously:

0000000000000000 d _ZL18can_use_agent_enum

is now:

0000000000000030 r _ZL18can_use_agent_enum

2020-09-14  Tom Tromey  <tromey@adacore.com>

	* x86-tdep.h (x86_in_indirect_branch_thunk): Update.
	* x86-tdep.c (x86_is_thunk_register_name)
	(x86_in_indirect_branch_thunk): Update.
	* sparc64-tdep.c (sparc64_fpu_register_names)
	(sparc64_cp0_register_names, sparc64_register_names)
	(sparc64_pseudo_register_names): Now const.
	* sparc-tdep.h (struct gdbarch_tdep) <fpu_register_names,
	cp0_registers_num>: Now const.
	* sparc-tdep.c (sparc_core_register_names)
	(sparc32_fpu_register_names, sparc32_cp0_register_names)
	(sparc32_pseudo_register_names): Now const.
	(validate_tdesc_registers): Update.
	* rust-lang.c (rust_extensions): Now const.
	* p-lang.c (p_extensions): Now const.
	* objc-lang.c (objc_extensions): Now const.
	* nto-tdep.c (nto_thread_state_str): Now const.
	* moxie-tdep.c (moxie_register_names): Now const.
	* mips-tdep.h (struct gdbarch_tdep) <mips_processor_reg_names>:
	Now const.
	* mips-tdep.c (mips_generic_reg_names, mips_tx39_reg_names)
	(mips_linux_reg_names): Now const.
	(mips_gdbarch_init): Update.
	* microblaze-tdep.c (microblaze_register_names): Now const.
	* m68k-tdep.c (m68k_register_names): Now const.
	* m32r-tdep.c (m32r_register_names): Now const.
	* ia64-tdep.c (ia64_register_names): Now const.
	* i386-tdep.h (struct gdbarch_tdep) <register_names,
	ymmh_register_names, ymm16h_regnum, mpx_register_names,
	k_register_names, zmmh_register_names, xmm_avx512_register_names,
	ymm_avx512_register_names, pkeys_register_names>: Now const.
	* i386-tdep.c (i386_register_names, i386_zmm_names)
	(i386_zmmh_names, i386_k_names, i386_ymm_names, i386_ymmh_names)
	(i386_mpx_names, i386_pkeys_names, i386_bnd_names)
	(i386_mmx_names, i386_byte_names, i386_word_names): Now const.
	* f-lang.c (f_extensions): Now const.
	* d-lang.c (d_extensions): Now const.
	* csky-tdep.c (csky_register_names): Now const.
	* charset.c (default_charset_names, charset_enum): Now const.
	(_initialize_charset): Update.
	* c-lang.c (c_extensions, cplus_extensions, asm_extensions): Now
	const.
	* bsd-uthread.c (bsd_uthread_solib_names): Now const.
	(bsd_uthread_solib_loaded): Update.
	(bsd_uthread_state): Now const.
	* amd64-tdep.c (amd64_register_names, amd64_ymm_names)
	(amd64_ymm_avx512_names, amd64_ymmh_names)
	(amd64_ymmh_avx512_names, amd64_mpx_names, amd64_k_names)
	(amd64_zmmh_names, amd64_zmm_names, amd64_xmm_avx512_names)
	(amd64_pkeys_names, amd64_byte_names, amd64_word_names)
	(amd64_dword_names): Now const.
	* agent.c (can_use_agent_enum): Now const.
	* ada-tasks.c (task_states, long_task_states): Now const.
	* ada-lang.c (known_runtime_file_name_patterns)
	(known_auxiliary_function_name_patterns, attribute_names)
	(standard_exc, ada_extensions): Now const.

gdbserver/ChangeLog
2020-09-14  Tom Tromey  <tromey@adacore.com>

	* tracepoint.cc (eval_result_names): Now const.
	* ax.cc (gdb_agent_op_names): Now const.

1 files changed, 4 insertions, 4 deletions

diff --git a/gdb/mips-tdep.c b/gdb/mips-tdep.c
index 9e2a9cb..48ee822 100644
--- a/gdb/mips-tdep.c
+++ b/gdb/mips-tdep.c
@@ -578,7 +578,7 @@ enum
 
 /* Generic MIPS.  */
 
-static const char *mips_generic_reg_names[NUM_MIPS_PROCESSOR_REGS] = {
+static const char * const mips_generic_reg_names[NUM_MIPS_PROCESSOR_REGS] = {
   "sr", "lo", "hi", "bad", "cause", "pc",
   "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
   "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",
@@ -589,7 +589,7 @@ static const char *mips_generic_reg_names[NUM_MIPS_PROCESSOR_REGS] = {
 
 /* Names of tx39 registers.  */
 
-static const char *mips_tx39_reg_names[NUM_MIPS_PROCESSOR_REGS] = {
+static const char * const mips_tx39_reg_names[NUM_MIPS_PROCESSOR_REGS] = {
   "sr", "lo", "hi", "bad", "cause", "pc",
   "", "", "", "", "", "", "", "",
   "", "", "", "", "", "", "", "",
@@ -601,7 +601,7 @@ static const char *mips_tx39_reg_names[NUM_MIPS_PROCESSOR_REGS] = {
 };
 
 /* Names of registers with Linux kernels.  */
-static const char *mips_linux_reg_names[NUM_MIPS_PROCESSOR_REGS] = {
+static const char * const mips_linux_reg_names[NUM_MIPS_PROCESSOR_REGS] = {
   "sr", "lo", "hi", "bad", "cause", "pc",
   "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
   "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",
@@ -8049,7 +8049,7 @@ mips_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   enum mips_fpu_type fpu_type;
   struct tdesc_arch_data *tdesc_data = NULL;
   int elf_fpu_type = Val_GNU_MIPS_ABI_FP_ANY;
-  const char **reg_names;
+  const char * const *reg_names;
   struct mips_regnum mips_regnum, *regnum;
   enum mips_isa mips_isa;
   int dspacc;