ipa-inline.c (ipa_inline): Check that function is defined before flattening.

	* ipa-inline.c (ipa_inline): Check that function is defined before
	flattening.
	* gcc.c-torture/compile/flatten.c: New testcase.

From-SVN: r278139

gcc/ChangeLog

+2019-11-13  Jan Hubicka  <hubicka@ucw.cz>
+
+	* ipa-inline.c (ipa_inline): Check that function is defined before
+	flattening.
+
 2019-11-13  Andrew Stubbs  <ams@codesourcery.com>
 	    Julian Brown  <julian@codesourcery.com>
 

gcc/ipa-inline.c

@@ -2564,8 +2564,9 @@ ipa_inline (void)
   for (i = nnodes - 1, j = i; i >= 0; i--)
     {
       node = order[i];
-      if (lookup_attribute ("flatten",
-			    DECL_ATTRIBUTES (node->decl)) != NULL)
+      if (node->definition
+	  && lookup_attribute ("flatten",
+			       DECL_ATTRIBUTES (node->decl)) != NULL)
 	order[j--] = order[i];
     }
 

gcc/testsuite/ChangeLog

+2019-11-13  Jan Hubicka  <hubicka@ucw.cz>
+
+	* gcc.c-torture/compile/flatten.c: New testcase.
+
 2019-11-13  Tobias Burnus  <tobias@codesourcery.com>
 
 	PR fortran/92470

gcc/testsuite/gcc.c-torture/compile/flatten.c

+int you_shall_not_flatten_me () __attribute__ ((flatten));
+main()
+{
+  you_shall_not_flatten_me ();
+}