[Bug c++/67678] New: Nested class can be re-declared after definition

[Bug c++/67678] New: Nested class can be re-declared after definition

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67678

            Bug ID: 67678
           Summary: Nested class can be re-declared after definition
           Product: gcc
           Version: 5.2.1
            Status: UNCONFIRMED
          Keywords: accepts-invalid
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: redi at gcc dot gnu.org
  Target Milestone: ---

This should give a diagnostic:

struct A { struct B{}; struct B; };

9.2 [class.mem] p1:

   A member shall not be declared twice in the member-specification,
   except that a nested class or member class template can be declared
   and then later defined, [...]


Clang warns:

x.cc:1:31: warning: class member cannot be redeclared
[-Wredeclared-class-member]
struct A { struct B{}; struct B; };
                              ^
x.cc:1:19: note: previous declaration is here
struct A { struct B{}; struct B; };
                  ^
1 warning generated.

EDG warns:

"x.cc", line 1: warning: invalid redeclaration of nested class
  struct A { struct B{}; struct B; };
                                ^

[Bug c++/67678] Nested class can be re-declared after definition

[daniel.kruegler at googlemail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67678

Daniel Krügler <daniel.kruegler at googlemail dot com> changed:

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--- Comment #1 from Daniel Krügler <daniel.kruegler at googlemail dot com> ---
Personally I think that allowing this looks like a reasonable extension, but I
agree that using -pedantic this should be diagnosed (which it doesn't yet).
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Subject: [Bug c++/67687] [c++0x][constexpr] initialize constexpr member with constexpr constructor
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67687

Daniel Krügler <daniel.kruegler at googlemail dot com> changed:

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--- Comment #1 from Daniel Krügler <daniel.kruegler at googlemail dot com> ---
Same problem in 6.0 trunk
>From gcc-bugs-return-498096-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Sep 26 17:08:59 2015
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From: "ikozhukhov at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug bootstrap/67725] New: all gcc versions has hardcoded LD path with bootstrap on illumos platform
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idg725

            Bug ID: 67725
           Summary: all gcc versions has hardcoded LD path with bootstrap
                    on illumos platform
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ikozhukhov at gmail dot com
  Target Milestone: ---

on autotools i can see we try to use for solaris2* targets :
ld=/usr/ccs/bin/ld
example from gcc-4.8.5/gcc/acinclude.m4:
line 518: gcc_cv_sun_ld_ver=`/usr/ccs/bin/ld -V 2>&1`

it is mistake to use hadrcoded ld path because on illumos we have
ld=/usr/bin/ld and we can specify correct path by:
--without-gnu-ld --with-ld=/usr/bin/ld

but by autotools we will try to identify LD version by hardcoded
/usr/ccs/bin/ld and it is mistake.
have to fix it on all gcc versions, because for DilOS (http://www.dilos.org,
illumos based platform) i have plans remove old /usr/ccs links and it will
failed with gcc bootstrap.

[Bug c++/67678] Nested class can be re-declared after definition

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67678

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Yes, it might be an intentional GNU extension. Older versions of Clang warned
about it with the -Wgnu option rather than -Wredeclared-class-member.