Fix trampoline execution failures on GCN5.

2019-05-22  Andrew Stubbs  <ams@codesourcery.com>

	gcc/
	* config/gcn/gcn.c (gcn_trampoline_init): Call "sorry" on GCN5.

From-SVN: r271525

gcc/ChangeLog

+2019-05-22  Andrew Stubbs  <ams@codesourcery.com>
+
+	* config/gcn/gcn.c (gcn_trampoline_init): Call "sorry" on GCN5.
+
 2019-05-22  Jason Merrill  <jason@redhat.com>
 
 	* gimplify.c (gimplify_cond_expr): Don't check TREE_ADDRESSABLE.

gcc/config/gcn/gcn.c

@@ -3062,6 +3062,10 @@ gcn_asm_trampoline_template (FILE *f)
 static void
 gcn_trampoline_init (rtx m_tramp, tree fndecl, rtx chain_value)
 {
+  if (TARGET_GCN5_PLUS)
+    sorry ("nested function trampolines not supported on GCN5 due to"
+           " non-executable stacks");
+
   emit_block_move (m_tramp, assemble_trampoline_template (),
 		   GEN_INT (TRAMPOLINE_SIZE), BLOCK_OP_NORMAL);