Error out on nvptx for fpatchable-function-entry

2017-08-03  Tom de Vries  <tom@codesourcery.com>

	PR target/81662
	* config/nvptx/nvptx.c (nvptx_option_override): Emit sorry if
	function_entry_patch_area_size > 0.

	* gcc.target/nvptx/patchable_function_entry-default.c: New test.

---
 gcc/config/nvptx/nvptx.c                                  |  4 ++++
 .../gcc.target/nvptx/patchable_function_entry-default.c   | 15 +++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/gcc/config/nvptx/nvptx.c b/gcc/config/nvptx/nvptx.c
index 208b115..9211d1a 100644
--- a/gcc/config/nvptx/nvptx.c
+++ b/gcc/config/nvptx/nvptx.c
@@ -180,6 +180,10 @@ nvptx_option_override (void)
   if (!global_options_set.x_flag_no_common)
     flag_no_common = 1;
 
+  /* The patch area requires nops, which we don't have.  */
+  if (function_entry_patch_area_size > 0)
+    sorry ("not generating patch area, nops not supported");
+
   /* Assumes that it will see only hard registers.  */
   flag_var_tracking = 0;
 
diff --git a/gcc/testsuite/gcc.target/nvptx/patchable_function_entry-default.c b/gcc/testsuite/gcc.target/nvptx/patchable_function_entry-default.c
new file mode 100644
index 0000000..4254456
--- /dev/null
+++ b/gcc/testsuite/gcc.target/nvptx/patchable_function_entry-default.c
@@ -0,0 +1,15 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fpatchable-function-entry=3,1" } */
+
+extern int a;
+
+int f3 (void);
+
+int
+__attribute__((noinline))
+f3 (void)
+{
+  return 5*a;
+}
+
+/* { dg-excess-errors "sorry, unimplemented: not generating patch area, nops not supported" } */