re PR c++/86201 (ICE: Error reporting routines re-entered)

	PR c++/86201
	* typeck.c (cp_build_binary_op): Check c_inhibit_evaluation_warnings.

	* g++.dg/diagnostic/pr86201.C: New test.

From-SVN: r262353

gcc/cp/ChangeLog

+2018-07-03  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/86201
+	* typeck.c (cp_build_binary_op): Check c_inhibit_evaluation_warnings.
+
 2018-07-03  Jason Merrill  <jason@redhat.com>
 
 	PR c++/86378 - functional cast in noexcept-specifier.

gcc/cp/typeck.c

@@ -4734,6 +4734,7 @@ cp_build_binary_op (location_t location,
       if (code0 == VECTOR_TYPE && code1 == VECTOR_TYPE)
 	goto vector_compare;
       if ((complain & tf_warning)
+	  && c_inhibit_evaluation_warnings == 0
 	  && (FLOAT_TYPE_P (type0) || FLOAT_TYPE_P (type1)))
 	warning (OPT_Wfloat_equal,
 		 "comparing floating point with == or != is unsafe");

gcc/testsuite/ChangeLog

+2018-07-03  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/86201
+	* g++.dg/diagnostic/pr86201.C: New test.
+
 2018-07-03  Richard Sandiford  <richard.sandiford@arm.com>
 
 	PR tree-optimization/85694

gcc/testsuite/g++.dg/diagnostic/pr86201.C

+// PR c++/86201
+// { dg-do compile { target c++11 } }
+
+template <class U, class V>
+auto fn1 (V&& v) -> decltype(U(v))
+{
+  return; // { dg-error "return-statement with no value" }
+}
+void fn2 ()
+{
+  fn1<bool>(1.0);
+}