[Bug libstdc++/65762] New: --with-default-libstdcxx-abi=c++11 is silently ignored when --disable-libstdcxx-dual-abi is used

[Bug libstdc++/65762] New: --with-default-libstdcxx-abi=c++11 is silently ignored when --disable-libstdcxx-dual-abi is used

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65762

            Bug ID: 65762
           Summary: --with-default-libstdcxx-abi=c++11 is silently ignored
                    when --disable-libstdcxx-dual-abi is used
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: redi at gcc dot gnu.org

Ideally it should be possible to use only the new ABI (and that should be the
default for --enable-symvers=gnu-versioned-namespace) but it's not currently
supported.

Until it is supported, trying to configure the library that way should fail
with a clear explanation instead of appearing to configure OK and ignoring the
option.

[Bug libstdc++/65762] --with-default-libstdcxx-abi=c++11 is silently ignored when --disable-libstdcxx-dual-abi is used

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65762

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2015-04-14
           Assignee|unassigned at gcc dot gnu.org      |redi at gcc dot gnu.org
     Ever confirmed|0                           |1

[Bug libstdc++/65762] --with-default-libstdcxx-abi=c++11 is silently ignored when --disable-libstdcxx-dual-abi is used

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65762

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |NEW
           Assignee|redi at gcc dot gnu.org            |unassigned at gcc dot gnu.org

[Bug libstdc++/65762] --with-default-libstdcxx-abi=c++11 is silently ignored when --disable-libstdcxx-dual-abi is used

[iains at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65762

--- Comment #1 from Iain Sandoe <iains at gcc dot gnu.org> ---
so, FAOD, that means that 
versioned namespace => disables dual ABI 
                    => forces the old string impl?

What's the blocker to making it work?
(just time - or ABI issues?)

[Bug libstdc++/65762] --with-default-libstdcxx-abi=c++11 is silently ignored when --disable-libstdcxx-dual-abi is used

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65762

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2015-04-14 00:00:00         |2023-8-10
         Depends on|                            |83077

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Iain Sandoe from comment #1)
> so, FAOD, that means that 
> versioned namespace => disables dual ABI 
>                     => forces the old string impl?

Yes, that's PR 83077

> What's the blocker to making it work?
> (just time - or ABI issues?)

As it happens, François posted a patch for 83077 this morning:
https://gcc.gnu.org/pipermail/gcc-patches/2023-August/626925.html

I haven't reviewed it yet.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83077
[Bug 83077] sso-string @ gnu-versioned-namespace.

[Bug libstdc++/65762] --with-default-libstdcxx-abi=c++11 is silently ignored when --disable-libstdcxx-dual-abi is used

[fdumont at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65762

--- Comment #3 from François Dumont <fdumont at gcc dot gnu.org> ---
Created attachment 55834
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=55834&action=edit
Patch proposal

Here is a proposal that I'll submit on libstdc++ mailing list once PR83077 is
fixed. Note that in addition to allowing the configuration reported here it
also make --disable-libstdcxx-dual-abi use cxx11 abi per default. I'm not sure
that this part will be accepted.