load("@rules_cc//cc:defs.bzl", "cc_library")

package(default_visibility = ["//visibility:public"])

# ETL can be tailored to a project through an `etl_profile.h` header (see
# `include/etl/platform.h`). When no such header is on the include path, ETL
# falls back to its built-in defaults via `ETL_NO_PROFILE_HEADER`.
#
# This label_flag lets a consumer inject that profile as a Bazel target, without
# patching this BUILD file:
#
#     bazel build @etl//:etl --@etl//:etl_profile=//path/to:my_etl_profile
#
# The injected target is a cc_library that exposes a single `etl_profile.h` on
# its include path, for example:
#
#     cc_library(
#         name = "my_etl_profile",
#         hdrs = ["etl_profile.h"],
#         strip_include_prefix = ".",
#     )
#
# The default is empty, so ETL's built-in defaults are used unless overridden.
label_flag(
    name = "etl_profile",
    build_setting_default = ":no_profile",
)

cc_library(name = "no_profile")

cc_library(
    name = "etl",
    hdrs = glob(["include/**/*.h"]),
    includes = ["include"],
    deps = [":etl_profile"],
)