https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113081
--- Comment #3 from Iain Buclaw <ibuclaw at gdcproject dot org> ---
(In reply to Iain Buclaw from comment #2)
> If I recall correctly, this trick is not guaranteed to work (for a
> drtbegin.o and drtend.o object), as there really no control over where in
> the TLS section these variables will land.
>
> ```
> #ifdef DRT_BEGIN
> _Thread_local __SIZE_TYPE__ __tls_start = 3;
> #endif
>
> #ifdef DRT_END
> _Thread_local __SIZE_TYPE__ __tls_end;
> #endif
> ```
Both of these rely on the default linker script of:
.tdata : { *(.tdata .tdata.* .gnu.linkonce.td.*) }
.tbss : { *(.tbss .tbss.* .gnu.linkonce.tb.*) *(.tcommon) }
to group the sections in that order.
According to some old commit notes of mine for gdc in 2013, ld can reorder
.tdata after .tdata.*, despite what the linker script says.
