Re: [PATCH] c++: global-namespace-qualified var after class def [PR90107]

[Jason Merrill <jason@redhat.com>]

On 4/27/22 18:45, Marek Polacek wrote:
> Here we wrongly reject the definition of "::N::a"
> 
>    struct A;
>    namespace N { extern A a; }
>    struct A {} ::N::a;
> 
> because our code to diagnose a missing ; after a class definition doesn't
> realize that :: can follow a class definition.
> 
> Bootstrapped/regtested on x86_64-pc-linux-gnu, ok for trunk/11.4?

OK.

> 	PR c++/90107
> 
> gcc/cp/ChangeLog:
> 
> 	* parser.cc (cp_parser_class_specifier_1): Accept :: after a class
> 	definition.
> 
> gcc/testsuite/ChangeLog:
> 
> 	* g++.dg/parse/qualified6.C: New test.
> ---
>   gcc/cp/parser.cc                        |  1 +
>   gcc/testsuite/g++.dg/parse/qualified6.C | 10 ++++++++++
>   2 files changed, 11 insertions(+)
>   create mode 100644 gcc/testsuite/g++.dg/parse/qualified6.C
> 
> diff --git a/gcc/cp/parser.cc b/gcc/cp/parser.cc
> index 169e6a62f5f..2235da10c7c 100644
> --- a/gcc/cp/parser.cc
> +++ b/gcc/cp/parser.cc
> @@ -25933,6 +25933,7 @@ cp_parser_class_specifier_1 (cp_parser* parser)
>         case CPP_OPEN_PAREN:
>         case CPP_CLOSE_PAREN:
>         case CPP_COMMA:
> +      case CPP_SCOPE:
>           want_semicolon = false;
>           break;
>   
> diff --git a/gcc/testsuite/g++.dg/parse/qualified6.C b/gcc/testsuite/g++.dg/parse/qualified6.C
> new file mode 100644
> index 00000000000..68b51f771ec
> --- /dev/null
> +++ b/gcc/testsuite/g++.dg/parse/qualified6.C
> @@ -0,0 +1,10 @@
> +// PR c++/90107
> +// { dg-do compile }
> +
> +struct A;
> +namespace N { extern A a; }
> +struct A {} ::N::a;
> +
> +struct A1;
> +struct B { static A1 a1; };
> +struct A1 {} ::B::a1;
> 
> base-commit: 58e4a744b6e8140499ed6c33a8e9a6557e102f74