message: Display warning when overriding default rustc version in cargo.sh
diff: @@ -12,6 +12,11 @@ TOOLCHAIN=$(cat rust-toolchain)
  popd >/dev/null
  +if [[ $(rustc -V) != $(rustc +${TOOLCHAIN} -V) ]]; then
  + echo "rustc_codegen_cranelift is build for $(rustc +${TOOLCHAIN} -V) but the default rustc version is $(rustc -V)."
  + echo "Using $(rustc +${TOOLCHAIN} -V)."
  +fi
  +
  cmd=$1
  shift
  