Fix AIX gdb build with C++ compiler

We currently get:

 ../../src/gdb/aix-thread.c: In function 'int pdc_read_data(pthdb_user_t, void*, pthdb_addr_t, size_t)':
 ../../src/gdb/aix-thread.c:465:46: error: invalid conversion from 'void*' to 'gdb_byte* {aka unsigned char*}' [-fpermissive]
    status = target_read_memory (addr, buf, len);
					       ^


 ../../src/gdb/aix-thread.c: In function 'void aix_thread_resume(target_ops*, ptid_t, int, gdb_signal)':
 ../../src/gdb/aix-thread.c:1010:46: error: invalid conversion from 'void*' to 'int*' [-fpermissive]
	 gdb_signal_to_host (sig), (void *) tid);
					       ^
 ../../src/gdb/aix-thread.c:243:1: error:   initializing argument 5 of 'int ptrace64aix(int, int, long long int, int, int*)' [-fpermissive]
  ptrace64aix (int req, int id, long long addr, int data, int *buf)


 ../../src/gdb/rs6000-nat.c: In function 'gdb_byte* rs6000_ptrace_ldinfo(ptid_t)':
 ../../src/gdb/rs6000-nat.c:596:36: error: invalid conversion from 'void*' to 'gdb_byte* {aka unsigned char*}' [-fpermissive]
    gdb_byte *ldi = xmalloc (ldi_size);
				     ^
 ../../src/gdb/rs6000-nat.c:615:36: error: invalid conversion from 'void*' to 'gdb_byte* {aka unsigned char*}' [-fpermissive]
	ldi = xrealloc (ldi, ldi_size);
				     ^

(and more instances of the same).

gdb/ChangeLog:
2016-04-21  Pedro Alves  <palves@redhat.com>

	* aix-thread.c (pdc_read_data, pdc_write_data): Add cast.
	(aix_thread_resume): Use PTRACE_TYPE_ARG5.
	* rs6000-nat.c (rs6000_ptrace64): Use PTRACE_TYPE_ARG5.
	(rs6000_ptrace_ldinfo): Change type of 'ldi' local to void
	pointer, and cast return to gdb_byte pointer.

3 files changed, 16 insertions, 8 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 0741d1c..6e09030 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,13 @@
 2016-04-21  Pedro Alves  <palves@redhat.com>
 
+	* aix-thread.c (pdc_read_data, pdc_write_data): Add cast.
+	(aix_thread_resume): Use PTRACE_TYPE_ARG5.
+	* rs6000-nat.c (rs6000_ptrace64): Use PTRACE_TYPE_ARG5.
+	(rs6000_ptrace_ldinfo): Change type of 'ldi' local to void
+	pointer, and cast return to gdb_byte pointer.
+
+2016-04-21  Pedro Alves  <palves@redhat.com>
+
 	* s390-linux-nat.c (fetch_regset, store_regset, check_regset): Use
 	void * instead of gdb_byte *.
 
diff --git a/gdb/aix-thread.c b/gdb/aix-thread.c
index 1114046..693d6f6 100644
--- a/gdb/aix-thread.c
+++ b/gdb/aix-thread.c
@@ -462,7 +462,7 @@ pdc_read_data (pthdb_user_t user, void *buf,
       "pdc_read_data (user = %ld, buf = 0x%lx, addr = %s, len = %ld)\n",
       user, (long) buf, hex_string (addr), len);
 
-  status = target_read_memory (addr, buf, len);
+  status = target_read_memory (addr, (gdb_byte *) buf, len);
   ret = status == 0 ? PDC_SUCCESS : PDC_FAILURE;
 
   if (debug_aix_thread)
@@ -484,7 +484,7 @@ pdc_write_data (pthdb_user_t user, void *buf,
       "pdc_write_data (user = %ld, buf = 0x%lx, addr = %s, len = %ld)\n",
       user, (long) buf, hex_string (addr), len);
 
-  status = target_write_memory (addr, buf, len);
+  status = target_write_memory (addr, (gdb_byte *) buf, len);
   ret = status == 0 ? PDC_SUCCESS : PDC_FAILURE;
 
   if (debug_aix_thread)
@@ -1007,10 +1007,10 @@ aix_thread_resume (struct target_ops *ops,
 
       if (arch64)
 	ptrace64aix (PTT_CONTINUE, tid[0], (long long) 1,
-		     gdb_signal_to_host (sig), (void *) tid);
+		     gdb_signal_to_host (sig), (PTRACE_TYPE_ARG5) tid);
       else
 	ptrace32 (PTT_CONTINUE, tid[0], (addr_ptr) 1,
-		  gdb_signal_to_host (sig), (void *) tid);
+		  gdb_signal_to_host (sig), (PTRACE_TYPE_ARG5) tid);
     }
 }
 
diff --git a/gdb/rs6000-nat.c b/gdb/rs6000-nat.c
index ca333f2..1ae3cc3 100644
--- a/gdb/rs6000-nat.c
+++ b/gdb/rs6000-nat.c
@@ -143,9 +143,9 @@ rs6000_ptrace64 (int req, int id, long long addr, int data, void *buf)
 {
 #ifdef ARCH3264
 #  ifdef HAVE_PTRACE64
-  int ret = ptrace64 (req, id, addr, data, buf);
+  int ret = ptrace64 (req, id, addr, data, (PTRACE_TYPE_ARG5) buf);
 #  else
-  int ret = ptracex (req, id, addr, data, buf);
+  int ret = ptracex (req, id, addr, data, (PTRACE_TYPE_ARG5) buf);
 #  endif
 #else
   int ret = 0;
@@ -593,7 +593,7 @@ rs6000_ptrace_ldinfo (ptid_t ptid)
 {
   const int pid = ptid_get_pid (ptid);
   int ldi_size = 1024;
-  gdb_byte *ldi = xmalloc (ldi_size);
+  void *ldi = xmalloc (ldi_size);
   int rc = -1;
 
   while (1)
@@ -615,7 +615,7 @@ rs6000_ptrace_ldinfo (ptid_t ptid)
       ldi = xrealloc (ldi, ldi_size);
     }
 
-  return ldi;
+  return (gdb_byte *) ldi;
 }
 
 /* Implement the to_xfer_partial target_ops method for