From 04acc378eb62c937576065668df01a23fa1b0680 Mon Sep 17 00:00:00 2001
From: Alexandre Oliva <aoliva@redhat.com>
Date: Wed, 28 Mar 2018 05:04:59 +0000
Subject: [PATCH] [PR c++/84968] reject stmt-exprs in noexcept constexprs

We reject extended statement-expressions in template parameters, so we
might as well reject them in constant expressions used in noexcept
specifications.

for  gcc/cp/ChangeLog

	PR c++/84968
	* tree.c (strip_typedefs_expr): Reject STATEMENT_LISTs.

for  gcc/testsuite/ChangeLog

	PR c++/84968
	* g++.dg/eh/pr84968.C: New.

From-SVN: r258913
---
 gcc/cp/ChangeLog                  |  5 +++++
 gcc/cp/tree.c                     |  4 ++++
 gcc/testsuite/ChangeLog           |  5 +++++
 gcc/testsuite/g++.dg/eh/pr84968.C | 15 +++++++++++++++
 4 files changed, 29 insertions(+)
 create mode 100644 gcc/testsuite/g++.dg/eh/pr84968.C

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 4c02981..23f5d3a 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,8 @@
+2018-03-28  Alexandre Oliva <aoliva@redhat.com>
+
+	PR c++/84968
+	* tree.c (strip_typedefs_expr): Reject STATEMENT_LISTs.
+
 2018-03-27  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/85067
diff --git a/gcc/cp/tree.c b/gcc/cp/tree.c
index 0355b9e..e75c88d 100644
--- a/gcc/cp/tree.c
+++ b/gcc/cp/tree.c
@@ -1788,6 +1788,10 @@ strip_typedefs_expr (tree t, bool *remove_attributes)
       error ("lambda-expression in a constant expression");
       return error_mark_node;
 
+    case STATEMENT_LIST:
+      error ("statement-expression in a constant expression");
+      return error_mark_node;
+
     default:
       break;
     }
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index b195bd7..929d4dd 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2018-03-28  Alexandre Oliva <aoliva@redhat.com>
+
+	PR c++/84968
+	* g++.dg/eh/pr84968.C: New.
+
 2018-03-27  Michael Meissner  <meissner@linux.vnet.ibm.com>
 
 	PR target/84914
diff --git a/gcc/testsuite/g++.dg/eh/pr84968.C b/gcc/testsuite/g++.dg/eh/pr84968.C
new file mode 100644
index 0000000..23c49f4
--- /dev/null
+++ b/gcc/testsuite/g++.dg/eh/pr84968.C
@@ -0,0 +1,15 @@
+// { dg-do compile { target c++11 } }
+
+// { dg-options "" }
+
+union b;
+
+struct S {
+  template <typename>
+  void a()
+    try {
+    } catch (int ()
+	     noexcept (({ union b a; true; }))) // { dg-error "constant" }
+  {
+  }
+};
-- 
2.7.4