diff --git a/gas/app.c b/gas/app.c
index a3ad146625c..096829fd541 100644
--- a/gas/app.c
+++ b/gas/app.c
@@ -1537,3 +1537,16 @@ do_scrub_chars (size_t (*get) (char *, size_t), char *tostart, size_t tolen)
     last_char = to[-1];
   return to - tostart;
 }
+
+/* Return amount of pending input.  */
+
+size_t
+do_scrub_pending (void)
+{
+  size_t len = 0;
+  if (saved_input)
+    len += saved_input_len;
+  if (state == -1)
+    len += strlen (out_string);
+  return len;
+}
diff --git a/gas/as.h b/gas/as.h
index ff665c75812..730e134dce6 100644
--- a/gas/as.h
+++ b/gas/as.h
@@ -471,6 +471,7 @@ void   input_scrub_insert_file (char *);
 char * input_scrub_new_file (const char *);
 char * input_scrub_next_buffer (char **bufp);
 size_t do_scrub_chars (size_t (*get) (char *, size_t), char *, size_t);
+size_t do_scrub_pending (void);
 bool   scan_for_multibyte_characters (const unsigned char *, const unsigned char *, bool);
 int    gen_to_words (LITTLENUM_TYPE *, int, long);
 int    had_err (void);
diff --git a/gas/input-scrub.c b/gas/input-scrub.c
index ec0b007c77a..44e4bdca521 100644
--- a/gas/input-scrub.c
+++ b/gas/input-scrub.c
@@ -278,9 +278,11 @@ input_scrub_include_sb (sb *from, char *position, enum expansion expansion)
 
   next_saved_file = input_scrub_push (position);
 
-  /* Allocate sufficient space: from->len + optional newline.  */
+  /* Allocate sufficient space: from->len plus optional newline
+     plus two ".linefile " directives, plus a little more for other
+     expansion.  */
   newline = from->len >= 1 && from->ptr[0] != '\n';
-  sb_build (&from_sb, from->len + newline);
+  sb_build (&from_sb, from->len + newline + 2 * sizeof (".linefile") + 30);
   if (expansion == expanding_repeat && from_sb_expansion >= expanding_macro)
     expansion = expanding_nested;
   from_sb_expansion = expansion;
diff --git a/gas/macro.c b/gas/macro.c
index d799ba586e5..c2a47684b15 100644
--- a/gas/macro.c
+++ b/gas/macro.c
@@ -1046,6 +1046,8 @@ macro_expand_body (sb *in, sb *out, formal_entry *formals,
       loclist = f;
     }
 
+  if (!err && (out->len == 0 || out->ptr[out->len - 1] != '\n'))
+    sb_add_char (out, '\n');
   return err;
 }
 
diff --git a/gas/sb.c b/gas/sb.c
index c44016a0338..e83a5f524f8 100644
--- a/gas/sb.c
+++ b/gas/sb.c
@@ -119,11 +119,12 @@ sb_scrub_and_add_sb (sb *ptr, sb *s)
      So we loop until the input S is consumed.  */
   while (1)
     {
-      size_t copy = s->len - (scrub_position - s->ptr);
+      size_t copy = s->len - (scrub_position - s->ptr) + do_scrub_pending ();
       if (copy == 0)
 	break;
       sb_check (ptr, copy);
-      ptr->len += do_scrub_chars (scrub_from_sb, ptr->ptr + ptr->len, copy);
+      ptr->len += do_scrub_chars (scrub_from_sb, ptr->ptr + ptr->len,
+				  ptr->max - ptr->len);
     }
 
   sb_to_scrub = 0;
diff --git a/gas/testsuite/config/default.exp b/gas/testsuite/config/default.exp
index 5a3dda915f7..21859d961d9 100644
--- a/gas/testsuite/config/default.exp
+++ b/gas/testsuite/config/default.exp
@@ -52,6 +52,14 @@ if ![info exists NMFLAGS] then {
     set NMFLAGS {}
 }
 
+if ![info exists SIZE] then {
+    set SIZE [findfile $base_dir/size]
+}
+
+if ![info exists SIZEFLAGS] then {
+    set SIZEFLAGS ""
+}
+
 if ![info exists OBJCOPY] then {
     set OBJCOPY [findfile $base_dir/../../binutils/objcopy]
 }
diff --git a/gas/testsuite/gas/macros/app5.d b/gas/testsuite/gas/macros/app5.d
new file mode 100644
index 00000000000..0a1483ccc3a
--- /dev/null
+++ b/gas/testsuite/gas/macros/app5.d
@@ -0,0 +1,6 @@
+#name: APP with linefile
+#xfail: tic30-*-*
+#size: -G
+# pr29466 just check that the test assembles
+
+#pass
diff --git a/gas/testsuite/gas/macros/app5.s b/gas/testsuite/gas/macros/app5.s
new file mode 100644
index 00000000000..a960ae223ba
--- /dev/null
+++ b/gas/testsuite/gas/macros/app5.s
@@ -0,0 +1,5 @@
+#NO_APP
+#APP
+# 5 "foo.c" 1
+# 0 "" 2
+#NO_APP
diff --git a/gas/testsuite/gas/macros/macros.exp b/gas/testsuite/gas/macros/macros.exp
index 915c45d74f6..7a45af4a308 100644
--- a/gas/testsuite/gas/macros/macros.exp
+++ b/gas/testsuite/gas/macros/macros.exp
@@ -70,6 +70,7 @@ run_dump_test app2
 run_dump_test app3
 remote_download host "$srcdir/$subdir/app4b.s"
 run_dump_test app4
+run_dump_test app5
 
 run_list_test badarg ""