Pigweed

*_files (compiler_files, all_files, etc.) is very error_prone.

We will instead migrate to a new API. Before:

filegroup(
    name = "sysroot",
    srcs = glob(["sysroot/**"]),
)

pw_cc_toolchain(
    ...,
    compiler_files = [":sysroot"],
    # all_files must always be a superset of compiler_files.
    all_files = [":sysroot"]
)

After:

pw_cc_additional_files(
  name = "sysroot"
  actions = ["//actions:all_compile_actions"],
  srcs = glob(["sysroot/**"])
)

pw_cc_toolchain(
   ...
   additional_files = [":sysroot"],
)