[C++ PATCH] PR c++/83895

[Ville Voutilainen]

Finishing testing the attached, OK for trunk?

2018-01-21  Ville Voutilainen  <ville.voutilai...@gmail.com>

    PR c++/83895

    cp/

    * decl.c (grokdeclarator): Don't diagnose extra parens
    on typedefs.

    testsuite/

    * g++.dg/warn/83895.C: New.

diff --git a/gcc/cp/decl.c b/gcc/cp/decl.c
index 039ddd9..230e7dd 100644
--- a/gcc/cp/decl.c
+++ b/gcc/cp/decl.c
@@ -10882,6 +10882,7 @@ grokdeclarator (const cp_declarator *declarator,
         to be a constructor call.  */
       if (decl_context != PARM
          && decl_context != TYPENAME
+         && !typedef_p
          && declarator->parenthesized != UNKNOWN_LOCATION
          /* If the type is class-like and the inner name used a
             global namespace qualifier, we need the parens.
diff --git a/gcc/testsuite/g++.dg/warn/83895.C 
b/gcc/testsuite/g++.dg/warn/83895.C
new file mode 100644
index 0000000..86b317f
--- /dev/null
+++ b/gcc/testsuite/g++.dg/warn/83895.C
@@ -0,0 +1,7 @@
+// { dg-additional-options -Wparentheses }
+// { dg-do compile { target c++11 } }
+
+struct X;
+
+typedef int (X::*foo);
+using bar = int (X::*);