On Sat, 14 May 2022 at 16:36, François Dumont via Libstdc++
<libstdc++@gcc.gnu.org> wrote:
>
> Versioned namespace does not compile after this patch. With this patch
> it compiles but does not link because of:
>
> /usr/bin/ld: /usr/bin/ld: DWARF error: can't find .debug_ranges section.
> ../src/c++11/.libs/libc++11convenience.a(chrono.o): in function
> `std::__8::chrono::system_clock::now()':
> chrono.cc:(.text._ZNSt3__86chrono12system_clock3nowEv+0x0): multiple
> definition of `std::__8::chrono::system_clock::now()'; /usr/bin/ld:
> DWARF error: can't find .debug_ranges section.
> .libs/compatibility-chrono.o:compatibility-chrono.cc:(.text._ZNSt3__86chrono12system_clock3nowEv+0x0):
> first defined here

Oops, I knew I'd forgotten to check something!

I think the attached patch would be better. This stops defining the
C++0x compat symbols for the versioned namespace. Those symbols only
exist for backwards compatibility with ancient versions of
libstdc++.so.6 (from GCC 4.6 and similar vintages). We don't need
those symbols in libstdc++.so.8 at all.

This fixes the versioned namespace build, I'm running the tests now.