https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104957
--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> --- So, what do we get after specifying -malias -mptx=6.3? Alias attribute only for functions, not variables. No support for weak alias (allowing this does compile, but we run into execution fails in gcc.dg/globalalias.c and gcc.dg/pr77587.c). No support for aliases of weak functions. We can't detect this in the compiler, so we'll run into linker error "error: Function test with .weak scope cannot be aliased".
