[Bug libstdc++/64367] New: [5 Regression] g++-v5/stdexcept:52:28: error: invalid use of non-static data member '_M_p'

[Bug libstdc++/64367] New: [5 Regression] g++-v5/stdexcept:52:28: error: invalid use of non-static data member '_M_p'

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64367

            Bug ID: 64367
           Summary: [5 Regression] g++-v5/stdexcept:52:28: error: invalid
                    use of non-static data member '_M_p'
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: trippels at gcc dot gnu.org
                CC: redi at gcc dot gnu.org

Since r218964 clang complains, e.g.:

markus@x4 ~ % clang++ -Ofast -w tramp3d-v4.cpp
In file included from tramp3d-v4.cpp:7:
In file included from
/usr/lib64/gcc/x86_64-pc-linux-gnu/5.0.0/include/g++-v5/complex:45:
In file included from
/usr/lib64/gcc/x86_64-pc-linux-gnu/5.0.0/include/g++-v5/sstream:38:
In file included from
/usr/lib64/gcc/x86_64-pc-linux-gnu/5.0.0/include/g++-v5/istream:38:
In file included from
/usr/lib64/gcc/x86_64-pc-linux-gnu/5.0.0/include/g++-v5/ios:42:
In file included from
/usr/lib64/gcc/x86_64-pc-linux-gnu/5.0.0/include/g++-v5/bits/ios_base.h:44:
/usr/lib64/gcc/x86_64-pc-linux-gnu/5.0.0/include/g++-v5/stdexcept:52:28: error:
invalid use of non-static data member '_M_p'
      char _M_bytes[sizeof(_M_p)];
                           ^~~~
1 error generated.

[Bug libstdc++/64367] [5 Regression] g++-v5/stdexcept:52:28: error: invalid use of non-static data member '_M_p'

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64367

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I don't know why clang complains, it accepts this, which shouldn't be any
different:

  char _M_bytes[sizeof(decltype(_M_p))];

[Bug libstdc++/64367] [5 Regression] g++-v5/stdexcept:52:28: error: invalid use of non-static data member '_M_p'

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64367

--- Comment #2 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
It doesn't accept your example for C++98, too. C++11 is fine.

markus@x4 ~ % cat test.ii
union u
{
  const char *_M_p;
  char _M_bytes[sizeof (_M_p)];
};

markus@x4 ~ % clang++ -std=c++11 -O2 -c test.ii
markus@x4 ~ % clang++ -O2 -c test.ii
test.ii:4:25: error: invalid use of non-static data member '_M_p'
  char _M_bytes[sizeof (_M_p)];
                        ^~~~
1 error generated.
markus@x4 ~ % 

This looks correct to me.

[Bug libstdc++/64367] [5 Regression] g++-v5/stdexcept:52:28: error: invalid use of non-static data member '_M_p'

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64367

--- Comment #3 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
See § 5.1.1-13 for C++11 and § 5.1-10 for C++98.
The C++98 standard doesn't mention unevaluated operands.
>From gcc-bugs-return-471446-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Dec 20 14:23:38 2014
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Subject: [Bug libstdc++/64367] [5 Regression] g++-v5/stdexcept:52:28: error: invalid use of non-static data member '_M_p'
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idd367

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Oh it's only for 98, I see.

Well it's easy to fix with sizeof(const char*) anyway.

[Bug libstdc++/64367] [5 Regression] g++-v5/stdexcept:52:28: error: invalid use of non-static data member '_M_p'

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64367

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Sun Dec 21 15:16:08 2014
New Revision: 218997

URL: https://gcc.gnu.org/viewcvs?rev=218997&root=gcc&view=rev
Log:
    PR libstdc++/64367
    * include/std/stdexcept: Don't use non-static member in sizeof.

Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/include/std/stdexcept

[Bug libstdc++/64367] [5 Regression] g++-v5/stdexcept:52:28: error: invalid use of non-static data member '_M_p'

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64367

Jonathan Wakely <redi at gcc dot gnu.org> changed:

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

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
should be fixed

[Bug libstdc++/64367] [5 Regression] g++-v5/stdexcept:52:28: error: invalid use of non-static data member '_M_p'

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64367

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
   Last reconfirmed|                            |2015-02-26
         Resolution|FIXED                       |---
           Assignee|unassigned at gcc dot gnu.org      |redi at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
There's another instance of the same error later in the file:

/../lib/gcc/x86_64-redhat-linux/5.0.0/../../../../include/c++/5.0.0/stdexcept:83:28:
error: invalid use of non-static data member '_M_s'
      char _M_bytes[sizeof(_M_s)];
                           ^~~~

[Bug libstdc++/64367] [5 Regression] g++-v5/stdexcept:52:28: error: invalid use of non-static data member '_M_p'

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64367

--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Mon Mar  2 16:50:24 2015
New Revision: 221118

URL: https://gcc.gnu.org/viewcvs?rev=221118&root=gcc&view=rev
Log:
    PR libstdc++/64367
    * include/std/stdexcept (__sso_string): Don't use non-static member
    in sizeof.

Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/include/std/stdexcept

[Bug libstdc++/64367] [5 Regression] g++-v5/stdexcept:52:28: error: invalid use of non-static data member '_M_p'

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64367

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|---                         |FIXED
   Target Milestone|---                         |5.0

--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Should really be fixed this time.

[Bug libstdc++/64367] [5 Regression] g++-v5/stdexcept:52:28: error: invalid use of non-static data member '_M_p'

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64367

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dcb314 at hotmail dot com

--- Comment #10 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 65399 has been marked as a duplicate of this bug. ***