[Bug c++/99980] New: Delayed parsing of noexcept doesn't work in member function template

[Bug c++/99980] New: Delayed parsing of noexcept doesn't work in member function template

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99980

            Bug ID: 99980
           Summary: Delayed parsing of noexcept doesn't work in member
                    function template
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mpolacek at gcc dot gnu.org
  Target Milestone: ---

We should accept this:

struct S {
  template<typename T>
  void f(T) noexcept(B);
  static constexpr bool B = true;
};

but we don't; we need something like

--- a/gcc/cp/parser.c
+++ b/gcc/cp/parser.c
@@ -30526,7 +30526,8 @@ cp_parser_single_declaration (cp_parser* parser,
      || decl_specifiers.type != error_mark_node))
     {
       decl = cp_parser_init_declarator (parser,
-                   CP_PARSER_FLAGS_TYPENAME_OPTIONAL,
+                   CP_PARSER_FLAGS_TYPENAME_OPTIONAL
+                   | CP_PARSER_FLAGS_DELAY_NOEXCEPT,
                        &decl_specifiers,
                        checks,
                        /*function_definition_allowed_p=*/true,

(but not when friend_p).  Found while looking into
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99806#c3.

[Bug c++/99980] Delayed parsing of noexcept doesn't work in member function template

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99980

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
           Assignee|unassigned at gcc dot gnu.org      |mpolacek at gcc dot gnu.org
             Status|UNCONFIRMED                 |ASSIGNED
           Keywords|                            |rejects-valid
   Last reconfirmed|                            |2021-04-08

--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Not a regression.  Mine for GCC 12.

[Bug c++/99980] Delayed parsing of noexcept doesn't work in member function template

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99980

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Marek Polacek <mpolacek@gcc.gnu.org>:

https://gcc.gnu.org/g:06041b2c67a5d4d0941c53990f0438a309703ed0

commit r12-6025-g06041b2c67a5d4d0941c53990f0438a309703ed0
Author: Marek Polacek <polacek@redhat.com>
Date:   Wed Dec 15 17:41:53 2021 -0500

    c++: delayed noexcept in member function template [PR99980]

    Some time ago I noticed that we don't properly delay parsing of
    noexcept for member function templates.  This patch fixes that.

    It didn't work because even though we set CP_PARSER_FLAGS_DELAY_NOEXCEPT
    in cp_parser_member_declaration, member template declarations take
    a different path: we call cp_parser_template_declaration and return
    prior to setting the flag.

            PR c++/99980

    gcc/cp/ChangeLog:

            * parser.c (cp_parser_single_declaration): Maybe pass
            CP_PARSER_FLAGS_DELAY_NOEXCEPT down to cp_parser_init_declarator.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp0x/noexcept71.C: New test.

[Bug c++/99980] Delayed parsing of noexcept doesn't work in member function template

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99980

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|ASSIGNED                    |RESOLVED

--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed.

[Bug c++/99980] Delayed parsing of noexcept doesn't work in member function template

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99980

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |12.0