[Bug other/67092] bootstrap failure in running genpreds, libstdc++ version mismatch

["vries at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67092

--- Comment #11 from vries at gcc dot gnu.org ---
(In reply to vries from comment #10)
> Looking at the description of with-host-libstdcxx:
> ...
> --with-host-libstdcxx=linker-args
> If you are linking with a static copy of PPL, you can use this option to
> specify how the linker should find the standard C++ library used internally
> by PPL. Typical values of linker-args might be â-lstdc++â or
> â-Wl,-Bstatic,-lstdc++,-Bdynamic -lmâ. If you are linking with a shared copy
> of PPL, you probably do not need this option; shared library dependencies
> will cause the linker to search for the standard C++ library automatically. 
> ...
> 
> We no longer support building with PPL (
> https://gcc.gnu.org/ml/gcc-patches/2012-06/msg01773.html ), so this doc item
> probably needs to be updated.

--with-host-libstdcxx=linker-args
Sets default value for --with-stage1-libs and --with-boot-libs. Sets default
value for --with-boot-ldflags to empty.