[PATCH] libstdc++: Hide TLS variables in `std::call_once`

[Martin Storsjö]

On Fri, 29 Nov 2024, LIU Hao wrote:

> 在 2024-11-29 23:50, Jonathan Wakely 写道:
>>> It looks like your patch is against gcc-14 not trunk, the
>>> GLIBCXX_15.1.0 version is already there.
>> 
>> Sorry, I mean GLIBCXX_3.4.34 for 15.1.0
>
> Oops that's what I used to test the patch. Reapplied to master now.

Ping - what's the status of this patch?

It would be nice to switch to the new ABI structure for std::call_once as 
soon as possible, to ease a future switch to native TLS on mingw targets, 
once https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80881 is done. (This 
quirk with the exposed cross-DLL TLS data in std::call_once also comes up 
in a number of other situations on mingw, so it would be nice to switch to 
the new form where it is hidden.)

// Martin