Fix procfs.c compilation

procfs.c currently doesn't compile on Solaris:

/vol/src/gnu/gdb/gdb/local/gdb/procfs.c: In function `void _initialize_procfs()':
/vol/src/gnu/gdb/gdb/local/gdb/procfs.c:3734:15: error: invalid initialization of reference of type `const target_info&' from expression of type `procfs_target*'
   add_target (&the_procfs_target);
               ^~~~~~~~~~~~~~~~~~
In file included from /vol/src/gnu/gdb/gdb/local/gdb/inferior.h:40,
                 from /vol/src/gnu/gdb/gdb/local/gdb/procfs.c:24:
/vol/src/gnu/gdb/gdb/local/gdb/target.h:2305:13: note: in passing argument 1 of `void add_target(const target_info&, void (*)(const char*, int), void (*)(cmd_list_element*, completion_tracker&, const char*, const char*))'
 extern void add_target (const target_info &info,
             ^~~~~~~~~~
/vol/src/gnu/gdb/gdb/local/gdb/procfs.c: In member function `virtual char* procfs_target::make_corefile_notes(bfd*, int*)':
/vol/src/gnu/gdb/gdb/local/gdb/procfs.c:3898:16: error: too many arguments to function `gdb::optional<std::vector<unsigned char, gdb::default_init_allocator<unsigned char, std::allocator<unsigned char> > > > target_read_alloc(target_ops*, target_object, const char*)'
     NULL, &auxv);
                ^
In file included from /vol/src/gnu/gdb/gdb/local/gdb/inferior.h:40,
                 from /vol/src/gnu/gdb/gdb/local/gdb/procfs.c:24:
/vol/src/gnu/gdb/gdb/local/gdb/target.h:341:40: note: declared here
 extern gdb::optional<gdb::byte_vector> target_read_alloc
                                        ^~~~~~~~~~~~~~~~~
/vol/src/gnu/gdb/gdb/local/gdb/procfs.c:3898:16: error: cannot convert `gdb::optional<std::vector<unsigned char, gdb::default_init_allocator<unsigned char, std::allocator<unsigned char> > > >' to `int' in assignment
     NULL, &auxv);
                ^

Fixed as follows.  Built and ran make check on 64-bit Solaris 11.5/x86
(amd64-pc-solaris2.11) only.

	* procfs.c (_initialize_procfs): Use add_inf_child_target.
	(procfs_target::make_corefile_notes): Adjust to new
	target_read_alloc return type.

2 files changed, 13 insertions, 11 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index edb60f7c008..42995dfc93a 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,9 @@
+2018-06-13  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+
+	* procfs.c (_initialize_procfs): Use add_inf_child_target.
+	(procfs_target::make_corefile_notes): Adjust to new
+	target_read_alloc return type.
+
 2018-06-12  Andrew Burgess  <andrew.burgess@embecosm.com>
 	    Stephen Roberts  <stephen.roberts@arm.com>
 
diff --git a/gdb/procfs.c b/gdb/procfs.c
index 082f5d43745..8b09eca6ed9 100644
--- a/gdb/procfs.c
+++ b/gdb/procfs.c
@@ -3731,7 +3731,7 @@ _initialize_procfs (void)
   add_com ("proc-untrace-exit", no_class, proc_untrace_sysexit_cmd,
 	   _("Cancel a trace of exits from the syscall."));
 
-  add_target (&the_procfs_target);
+  add_inf_child_target (&the_procfs_target);
 }
 
 /* =================== END, GDB  "MODULE" =================== */
@@ -3851,8 +3851,6 @@ procfs_target::make_corefile_notes (bfd *obfd, int *note_size)
   char *note_data = NULL;
   char *inf_args;
   struct procfs_corefile_thread_data thread_args;
-  gdb_byte *auxv;
-  int auxv_len;
   enum gdb_signal stop_signal;
 
   if (get_exec_file (0))
@@ -3894,14 +3892,12 @@ procfs_target::make_corefile_notes (bfd *obfd, int *note_size)
 			     &thread_args);
   note_data = thread_args.note_data;
 
-  auxv_len = target_read_alloc (current_top_target (), TARGET_OBJECT_AUXV,
-				NULL, &auxv);
-  if (auxv_len > 0)
-    {
-      note_data = elfcore_write_note (obfd, note_data, note_size,
-				      "CORE", NT_AUXV, auxv, auxv_len);
-      xfree (auxv);
-    }
+  gdb::optional<gdb::byte_vector> auxv =
+    target_read_alloc (current_top_target (), TARGET_OBJECT_AUXV, NULL);
+  if (auxv && !auxv->empty ())
+    note_data = elfcore_write_note (obfd, note_data, note_size,
+				    "CORE", NT_AUXV, auxv->data (),
+				    auxv->size ());
 
   return note_data;
 }