On Thu, 28 Apr 2022 at 05:56, François Dumont via Libstdc++
<libstdc++@gcc.gnu.org> wrote:
>
> Hi
>
>      Still time for this fix for gcc 12 ?

What needs fixing?

std::random_device is already declared in the versioned namespace in
<bits/random.h>:

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
...
  /**
   * A standard interface to a platform-specific non-deterministic
   * random number generator (if any are available).
   */
  class random_device
  {

So that means the definitions of its member functions will be exported
as std::__8::random_device::* already, the macros are not needed in
the src/*/*.cc files.

So it seems to me that the only "problem" is a redundant line in
config/abi/pre/gnu-versioned-namespace.ver. That line has no effect,
and can be removed.

I've pushed the attached patch instead.

>
>      If so I'll make sure to run tests quickly, especially the abi.exp
> one to confirm that the cleanup in gnu-versioned-namespace.ver do not
> need to be replaced by the same in __8 namespace.
>
> libstdc++: [_GLIBCXX_INLINE_VERSION] Fix std::random_device definition
>
> Definition shall be put in _GLIBCXX_BEGIN_VERSION_NAMESPACE/
> _GLIBCXX_END_VERSION_NAMESPACE like the declaration.
>
> libstdc++-v3/ChangeLog
>
>      * src/c++11/cow-string-inst.cc: Put random_device member definitions
>      in versioned namespace.
>      * src/c++11/random.cc: Likewise.
>      * config/abi/pre/gnu-versioned-namespace.ver: Remove std::random_device
>      symbols.
>
> François