[gcc(refs/vendors/redhat/heads/gcc-8-branch)] c++: Local class DMI using local static [PR90749]

[Jakub Jelinek]

https://gcc.gnu.org/g:337eb489ce9deb565b808b51ee2e75cd12e95102

commit 337eb489ce9deb565b808b51ee2e75cd12e95102
Author: Jason Merrill <jason@redhat.com>
Date:   Mon May 25 18:38:09 2020 -0400

    c++: Local class DMI using local static [PR90749]
    
    For default member initializers in templates it's important to push into the
    right context during get_nsdmi.  But for a local class that's not possible,
    and trying leaves the function context we need to be in, so don't try.
    
    gcc/cp/ChangeLog
    2020-05-01  Jason Merrill  <jason@redhat.com>
    
            PR c++/90749
            * init.c (get_nsdmi): Don't push_to_top_level for a local class.

Diff:
---
 gcc/cp/init.c                                 |  8 +++++---
 gcc/testsuite/g++.dg/cpp0x/nsdmi-template20.C | 13 +++++++++++++
 2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/gcc/cp/init.c b/gcc/cp/init.c
index 1a2a1f58819..7bd3f0e548b 100644
--- a/gcc/cp/init.c
+++ b/gcc/cp/init.c
@@ -587,16 +587,18 @@ get_nsdmi (tree member, bool in_ctor, tsubst_flags_t complain)
 	  DECL_INSTANTIATING_NSDMI_P (member) = 1;
 
 	  bool pushed = false;
-	  if (!currently_open_class (DECL_CONTEXT (member)))
+	  tree ctx = DECL_CONTEXT (member);
+	  if (!currently_open_class (ctx)
+	      && !LOCAL_CLASS_P (ctx))
 	    {
 	      push_to_top_level ();
-	      push_nested_class (DECL_CONTEXT (member));
+	      push_nested_class (ctx);
 	      pushed = true;
 	    }
 
 	  gcc_checking_assert (!processing_template_decl);
 
-	  inject_this_parameter (DECL_CONTEXT (member), TYPE_UNQUALIFIED);
+	  inject_this_parameter (ctx, TYPE_UNQUALIFIED);
 
 	  start_lambda_scope (member);
 
diff --git a/gcc/testsuite/g++.dg/cpp0x/nsdmi-template20.C b/gcc/testsuite/g++.dg/cpp0x/nsdmi-template20.C
new file mode 100644
index 00000000000..06448d92f12
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/nsdmi-template20.C
@@ -0,0 +1,13 @@
+// PR c++/90479
+// { dg-do compile { target c++11 } }
+
+template <int n>
+void foo ()
+{
+  static int i {100};
+  struct { int a {i++}; } b {};
+}
+int main ()
+{
+  foo<0> ();
+}