opt local-rebuild 0 "assume local-rust matches the current version, for rebuilds; implies local-rust, and is implied if local-rust already matches the current version"
opt llvm-static-stdcpp 0 "statically link to libstdc++ for LLVM"
opt llvm-link-shared 0 "prefer shared linking to LLVM (llvm-config --link-shared)"
+opt llvm-clean-rebuild 0 "delete LLVM build directory on rebuild"
opt rpath 1 "build rpaths into rustc itself"
opt stage0-landing-pads 1 "enable landing pads during bootstrap with stage0"
# This is used by the automation to produce single-target nightlies