Remove some unused variables

Found using the newly-enabled -Wunused-variable.

gdb/ChangeLog:

	* aarch64-linux-nat.c
	(aarch64_linux_nat_target::stopped_data_address): Remove unused
	variable.
	* arm-linux-nat.c (fetch_regs): Likewise.
	(store_regs): Likewise.
	(fetch_vfp_regs): Likewise.
	(store_vfp_regs): Likewise.
	(arm_linux_nat_target::insert_hw_breakpoint): Likewise.
	(arm_linux_nat_target::remove_hw_breakpoint): Likewise.
	(arm_linux_nat_target::insert_watchpoint): Likewise.
	(arm_linux_nat_target::remove_watchpoint): Likewise.
	* mips-linux-nat.c (mips_linux_nat_target::insert_watchpoint):
	Likewise.
	* nat/aarch64-sve-linux-ptrace.c (aarch64_sve_get_sveregs):
	Likewise.
	* ppc-linux-nat.c (fetch_register): Likewise.
	(fetch_all_gp_regs): Likewise.
	(fetch_ppc_registers): Likewise.
	(store_all_gp_regs): Likewise.
	(store_ppc_registers): Likewise.
	(hwdebug_insert_point): Likewise.
	(can_use_watchpoint_cond_accel): Likewise.
	* remote-sim.c (gdb_os_write_stdout): Likewise.

gdb/gdbserver/ChangeLog:

	* linux-mips-low.c (mips_collect_ptrace_register): Remove unused
	variable.
	(mips_supply_ptrace_register): Likewise.

gdb/ChangeLog

@@ -1,3 +1,29 @@
+2018-07-22  Simon Marchi  <simon.marchi@polymtl.ca>
+
+	* aarch64-linux-nat.c
+	(aarch64_linux_nat_target::stopped_data_address): Remove unused
+	variable.
+	* arm-linux-nat.c (fetch_regs): Likewise.
+	(store_regs): Likewise.
+	(fetch_vfp_regs): Likewise.
+	(store_vfp_regs): Likewise.
+	(arm_linux_nat_target::insert_hw_breakpoint): Likewise.
+	(arm_linux_nat_target::remove_hw_breakpoint): Likewise.
+	(arm_linux_nat_target::insert_watchpoint): Likewise.
+	(arm_linux_nat_target::remove_watchpoint): Likewise.
+	* mips-linux-nat.c (mips_linux_nat_target::insert_watchpoint):
+	Likewise.
+	* nat/aarch64-sve-linux-ptrace.c (aarch64_sve_get_sveregs):
+	Likewise.
+	* ppc-linux-nat.c (fetch_register): Likewise.
+	(fetch_all_gp_regs): Likewise.
+	(fetch_ppc_registers): Likewise.
+	(store_all_gp_regs): Likewise.
+	(store_ppc_registers): Likewise.
+	(hwdebug_insert_point): Likewise.
+	(can_use_watchpoint_cond_accel): Likewise.
+	* remote-sim.c (gdb_os_write_stdout): Likewise.
+
 2018-07-22  Simon Marchi  <simon.marchi@polymtl.ca>
 	    Tom Tromey  <tom@tromey.com>
 

gdb/aarch64-linux-nat.c

@@ -819,7 +819,7 @@ bool
 aarch64_linux_nat_target::stopped_data_address (CORE_ADDR *addr_p)
 {
   siginfo_t siginfo;
-  int i, tid;
+  int i;
   struct aarch64_debug_reg_state *state;
 
   if (!linux_nat_get_siginfo (inferior_ptid, &siginfo))

gdb/arm-linux-nat.c

@@ -205,7 +205,7 @@ store_fpregs (const struct regcache *regcache)
 static void
 fetch_regs (struct regcache *regcache)
 {
-  int ret, regno, tid;
+  int ret, tid;
   elf_gregset_t regs;
 
   /* Get the thread id for the ptrace call.  */
@@ -232,7 +232,7 @@ fetch_regs (struct regcache *regcache)
 static void
 store_regs (const struct regcache *regcache)
 {
-  int ret, regno, tid;
+  int ret, tid;
   elf_gregset_t regs;
 
   /* Get the thread id for the ptrace call.  */
@@ -339,7 +339,7 @@ static void
 fetch_vfp_regs (struct regcache *regcache)
 {
   gdb_byte regbuf[VFP_REGS_SIZE];
-  int ret, regno, tid;
+  int ret, tid;
   struct gdbarch *gdbarch = regcache->arch ();
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 
@@ -368,7 +368,7 @@ static void
 store_vfp_regs (const struct regcache *regcache)
 {
   gdb_byte regbuf[VFP_REGS_SIZE];
-  int ret, regno, tid;
+  int ret, tid;
   struct gdbarch *gdbarch = regcache->arch ();
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 
@@ -1064,7 +1064,6 @@ int
 arm_linux_nat_target::insert_hw_breakpoint (struct gdbarch *gdbarch,
 					    struct bp_target_info *bp_tgt)
 {
-  struct lwp_info *lp;
   struct arm_linux_hw_breakpoint p;
 
   if (arm_linux_get_hw_breakpoint_count () == 0)
@@ -1082,7 +1081,6 @@ int
 arm_linux_nat_target::remove_hw_breakpoint (struct gdbarch *gdbarch,
 					    struct bp_target_info *bp_tgt)
 {
-  struct lwp_info *lp;
   struct arm_linux_hw_breakpoint p;
 
   if (arm_linux_get_hw_breakpoint_count () == 0)
@@ -1134,7 +1132,6 @@ arm_linux_nat_target::insert_watchpoint (CORE_ADDR addr, int len,
 					 enum target_hw_bp_type rw,
 					 struct expression *cond)
 {
-  struct lwp_info *lp;
   struct arm_linux_hw_breakpoint p;
 
   if (arm_linux_get_hw_watchpoint_count () == 0)
@@ -1153,7 +1150,6 @@ arm_linux_nat_target::remove_watchpoint (CORE_ADDR addr,
 					 int len, enum target_hw_bp_type rw,
 					 struct expression *cond)
 {
-  struct lwp_info *lp;
   struct arm_linux_hw_breakpoint p;
 
   if (arm_linux_get_hw_watchpoint_count () == 0)

gdb/gdbserver/ChangeLog

@@ -1,3 +1,9 @@
+2018-07-22  Simon Marchi  <simon.marchi@polymtl.ca>
+
+	* linux-mips-low.c (mips_collect_ptrace_register): Remove unused
+	variable.
+	(mips_supply_ptrace_register): Likewise.
+
 2018-07-22  Tom Tromey  <tom@tromey.com>
 
 	* configure: Rebuild.

gdb/gdbserver/linux-mips-low.c

@@ -852,7 +852,6 @@ static void
 mips_collect_ptrace_register (struct regcache *regcache,
 			      int regno, char *buf)
 {
-  const struct target_desc *tdesc = current_process ()->tdesc;
   int use_64bit = sizeof (PTRACE_XFER_TYPE) == 8;
 
   if (use_64bit && register_size (regcache->tdesc, regno) == 4)
@@ -872,7 +871,6 @@ static void
 mips_supply_ptrace_register (struct regcache *regcache,
 			     int regno, const char *buf)
 {
-  const struct target_desc *tdesc = current_process ()->tdesc;
   int use_64bit = sizeof (PTRACE_XFER_TYPE) == 8;
 
   if (use_64bit && register_size (regcache->tdesc, regno) == 4)

gdb/mips-linux-nat.c

@@ -673,7 +673,6 @@ mips_linux_nat_target::insert_watchpoint (CORE_ADDR addr, int len,
   struct mips_watchpoint *new_watch;
   struct mips_watchpoint **pw;
 
-  int i;
   int retval;
 
   if (!mips_linux_read_watch_registers (inferior_ptid.lwp (),

gdb/nat/aarch64-sve-linux-ptrace.c

@@ -67,7 +67,6 @@ std::unique_ptr<gdb_byte[]>
 aarch64_sve_get_sveregs (int tid)
 {
   struct iovec iovec;
-  struct user_sve_header header;
   uint64_t vq = aarch64_sve_get_vq (tid);
 
   if (vq == 0)

gdb/ppc-linux-nat.c

@@ -532,11 +532,9 @@ static void
 fetch_register (struct regcache *regcache, int tid, int regno)
 {
   struct gdbarch *gdbarch = regcache->arch ();
-  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
   /* This isn't really an address.  But ptrace thinks of it as one.  */
   CORE_ADDR regaddr = ppc_register_u_addr (gdbarch, regno);
   int bytes_transferred;
-  unsigned int offset;         /* Offset of registers within the u area.  */
   gdb_byte buf[PPC_MAX_REGISTER_SIZE];
 
   if (altivec_register_p (gdbarch, regno))
@@ -630,8 +628,6 @@ fetch_register (struct regcache *regcache, int tid, int regno)
 static int
 fetch_all_gp_regs (struct regcache *regcache, int tid)
 {
-  struct gdbarch *gdbarch = regcache->arch ();
-  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
   gdb_gregset_t gregset;
 
   if (ptrace (PTRACE_GETREGS, tid, 0, (void *) &gregset) < 0)
@@ -728,7 +724,6 @@ fetch_fp_regs (struct regcache *regcache, int tid)
 static void 
 fetch_ppc_registers (struct regcache *regcache, int tid)
 {
-  int i;
   struct gdbarch *gdbarch = regcache->arch ();
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 
@@ -1004,8 +999,6 @@ store_register (const struct regcache *regcache, int tid, int regno)
 static int
 store_all_gp_regs (const struct regcache *regcache, int tid, int regno)
 {
-  struct gdbarch *gdbarch = regcache->arch ();
-  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
   gdb_gregset_t gregset;
 
   if (ptrace (PTRACE_GETREGS, tid, 0, (void *) &gregset) < 0)
@@ -1122,7 +1115,6 @@ store_fp_regs (const struct regcache *regcache, int tid, int regno)
 static void
 store_ppc_registers (const struct regcache *regcache, int tid)
 {
-  int i;
   struct gdbarch *gdbarch = regcache->arch ();
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  
@@ -1407,7 +1399,6 @@ hwdebug_insert_point (struct ppc_hw_breakpoint *b, int tid)
   gdb::unique_xmalloc_ptr<ppc_hw_breakpoint> p (XDUP (ppc_hw_breakpoint, b));
   struct hw_break_tuple *hw_breaks;
   struct thread_points *t;
-  struct hw_break_tuple *tuple;
 
   errno = 0;
   slot = ptrace (PPC_PTRACE_SETHWDEBUG, tid, 0, p.get ());
@@ -1627,7 +1618,6 @@ can_use_watchpoint_cond_accel (void)
   struct thread_points *p;
   int tid = inferior_ptid.lwp ();
   int cnt = hwdebug_info.num_condition_regs, i;
-  CORE_ADDR tmp_value;
 
   if (!have_ptrace_hwdebug_interface () || cnt == 0)
     return 0;

gdb/remote-sim.c

@@ -377,9 +377,6 @@ end_callbacks (void)
 static int
 gdb_os_write_stdout (host_callback *p, const char *buf, int len)
 {
-  int i;
-  char b[2];
-
   ui_file_write (gdb_stdtarg, buf, len);
   return len;
 }