zircon/system/ulib/hwreg/BUILD.gn

# Copyright 2019 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

library("hwreg") {
  sdk = "source"
  sdk_headers = [
    "hwreg/bitfields.h",
    "hwreg/internal.h",
    "hwreg/mmio.h",
  ]
  kernel = true
  static = true
  sources = [
    "printers.cpp",
  ]

  # **Note!** It's important that this library not depend on the
  # <lib/mmio/mmio.h> header at all, so it doesn't need to have
  # "$zx/system/dev/lib/mmio:headers" here.  The hwreg library can be used
  # with either the real mmio library ($zx/system/dev/lib/mmio) or with the
  # mock for testing ($zx/system/dev/lib/mock-mmio-reg).  The mock library
  # provides an alternate <lib/mmio/mmio.h> implementation.  If anything
  # that wants to use the mock library also winds up with the real library
  # in its deps (indirectly via public_deps in libraries like this) then
  # it's hard to make sure the library paths put the mock library first.
  # So it's better to simply avoid having the real library in the deps at
  # all.  But this means that this library's headers must be maintained so
  # that they can be used along with either <lib/mmio/mmio.h>
  # implementation without actually including *either* header at all.
  public_deps = [
    # <hwreg/internal.h> has #include <fbl/algorithm.h>.
    "$zx/system/ulib/fbl:headers",
  ]
}