https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118975
--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #4)
> #ifndef LINK_COMMAND_SPEC
> #define LINK_COMMAND_SPEC "\
> %{!fsyntax-only:%{!c:%{!M:%{!MM:%{!E:%{!S:\
> %(linker) " \
> LINK_PLUGIN_SPEC \
> "%{flto|flto=*:%<fcompare-debug*} \
> %{flto} %{fno-lto} %{flto=*} %l " LINK_PIE_SPEC \
> "%{fuse-ld=*:-fuse-ld=%*} " LINK_COMPRESS_DEBUG_SPEC \
> "%X %{o*} %{e*} %{N} %{n} %{r}\
> %{s} %{t} %{u*}
>
>
> I don't know how to filter out undef in the above gcc specs though.
A more explicit set of u* options to pass through might be better.
