Silence obstack.c -Wc++compat warning

	* obstack.c (_obstack_newchunk): Silence -Wc++compat warning.
	(_obstack_begin_worker): Likewise.  Move assignment to h->chunk
	after alloc failure check.

From-SVN: r229989

libiberty/ChangeLog

 2015-11-09  Alan Modra  <amodra@gmail.com>
 
+	* obstack.c (_obstack_newchunk): Silence -Wc++compat warning.
+	(_obstack_begin_worker): Likewise.  Move assignment to h->chunk
+	after alloc failure check.
+
+2015-11-09  Alan Modra  <amodra@gmail.com>
+
 	PR gdb/17133
 	* obstack.c (__alignof__): Expand alignof_type from alignof.h.
 	(obstack_exit_failure): Don't use exitfail.h.

libiberty/obstack.c

@@ -138,9 +138,10 @@ _obstack_begin_worker (struct obstack *h,
   h->chunk_size = size;
   h->alignment_mask = alignment - 1;
 
-  chunk = h->chunk = call_chunkfun (h, h->chunk_size);
+  chunk = (struct _obstack_chunk *) call_chunkfun (h, h->chunk_size);
   if (!chunk)
     (*obstack_alloc_failed_handler) ();
+  h->chunk = chunk;
   h->next_free = h->object_base = __PTR_ALIGN ((char *) chunk, chunk->contents,
                                                alignment - 1);
   h->chunk_limit = chunk->limit = (char *) chunk + h->chunk_size;
@@ -202,7 +203,7 @@ _obstack_newchunk (struct obstack *h, _OBSTACK_SIZE_T length)
 
   /* Allocate and initialize the new chunk.  */
   if (obj_size <= sum1 && sum1 <= sum2)
-    new_chunk = call_chunkfun (h, new_size);
+    new_chunk = (struct _obstack_chunk *) call_chunkfun (h, new_size);
   if (!new_chunk)
     (*obstack_alloc_failed_handler)();
   h->chunk = new_chunk;