bazel/BUILD.bazel

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

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

py_binary(
    name = "generate_version_header",
    srcs = ["generate_version_header.py"],
    legacy_create_init = False,
    visibility = ["//:__subpackages__"],
)

# This isn't actually generated, it just uses the same name
# to make it show up easier in searches.
#
# Rather than generating lists of headers to match CMake, the Bazel build
# opts to have a static header that transitively include two known headers.
# By default, empty header files are included, and users/platforms are expected
# to specify an appropriate `cc_library` to replace them.
#
# You tell bazel which `cc_library` provides the respective headers by
# configuring these `label_flag`s:
#
#     # Specify the library that provides "pico_config_extra_headers.h"
#     --@pico-sdk//bazel/config:PICO_CONFIG_EXTRA_HEADER=//my_proj:my_custom_headers
#
#     # Specify the library that provides "pico_config_platform_headers.h"
#     --@pico-sdk//bazel/config:PICO_CONFIG_PLATFORM_HEADER=//my_proj:my_custom_platform_headers
cc_library(
    name = "generate_config_header",
    hdrs = ["include/pico/config_autogen.h"],
    includes = ["include"],
    visibility = ["//:__subpackages__"],
    deps = [
        "//bazel/config:PICO_CONFIG_EXTRA_HEADER",
        "//bazel/config:PICO_CONFIG_PLATFORM_HEADER",
    ],
)

genrule(
    name = "empty_extra_headers_file",
    outs = ["generated_extra_include/pico_config_extra_headers.h"],
    cmd = "echo > $@",
    cmd_bat = "copy NUL $@",
    visibility = ["//visibility:private"],
)

cc_library(
    name = "no_extra_headers",
    hdrs = ["generated_extra_include/pico_config_extra_headers.h"],
    includes = ["generated_extra_include"],
    visibility = ["//visibility:private"],
)

# An empty stub, useful for label_flag flags that need to point to a library,
# but for some purposes the library needs to be a no-op.
cc_library(
    name = "empty_cc_lib",
)

# A library incompatible with everything. Use to mark an invalid configuration.
cc_library(
    name = "incompatible_cc_lib",
    target_compatible_with = ["@platforms//:incompatible"],
)