re PR c++/84455 (ICE in build_call_a at gcc/cp/call.c:389 during error reporting)

	PR c++/84455
	* pt.c (tsubst_lambda_expr): If not nested, increment temporarily
	function_depth to avoid GC during finish_lambda_function.

	* g++.dg/cpp0x/lambda/lambda-ice26.C: New test.

From-SVN: r257838

gcc/cp/ChangeLog

+2018-02-20  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/84455
+	* pt.c (tsubst_lambda_expr): If not nested, increment temporarily
+	function_depth to avoid GC during finish_lambda_function.
+
 2018-02-19  Jason Merrill  <jason@redhat.com>
 
 	PR c++/84429 - ICE capturing VLA.

gcc/cp/pt.c

@@ -17070,6 +17070,10 @@ tsubst_lambda_expr (tree t, tree args, tsubst_flags_t complain, tree in_decl)
       bool nested = cfun;
       if (nested)
 	push_function_context ();
+      else
+	/* Still increment function_depth so that we don't GC in the
+	   middle of an expression.  */
+	++function_depth;
 
       local_specialization_stack s (lss_copy);
 
@@ -17084,6 +17088,8 @@ tsubst_lambda_expr (tree t, tree args, tsubst_flags_t complain, tree in_decl)
 
       if (nested)
 	pop_function_context ();
+      else
+	--function_depth;
 
       /* The capture list was built up in reverse order; fix that now.  */
       LAMBDA_EXPR_CAPTURE_LIST (r)

gcc/testsuite/ChangeLog

+2018-02-20  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/84455
+	* g++.dg/cpp0x/lambda/lambda-ice26.C: New test.
+
 2018-02-19  Paul Thomas  <pault@gcc.gnu.org>
 
 	PR fortran/83344

gcc/testsuite/g++.dg/cpp0x/lambda/lambda-ice26.C

+// PR c++/84455
+// { dg-do compile { target c++11 } }
+// { dg-options "--param ggc-min-heapsize=0" }
+
+#include "lambda-ice14.C"