opt_nosave jemalloc 1 "build liballoc with jemalloc"
opt elf-tls 1 "elf thread local storage on platforms where supported"
opt full-bootstrap 0 "build three compilers instead of two"
+opt extended 0 "build an extended rust tool set"
valopt_nosave prefix "/usr/local" "set installation prefix"
valopt_nosave local-rust-root "/usr/local" "set prefix for local rust binary"