Add progress message to builtins_bzl_zip target
This is just a small quality of life improvement.
This is originally from PR it was split off to make submitting the
main change of that PR easier.
@@ -21,6 +21,7 @@ genrule(
cmd = "$(location //src:zip_builtins)" +
" ''" + # system zip
" $@ src/main/starlark/builtins_bzl $(SRCS)",
+ message = "Building builtins_bzl.zip",
output_to_bindir = 1,
tools = ["//src:zip_builtins"],
visibility = [
