zircon/third_party/ulib/lz4/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.

import("//build/zircon/migrated_targets.gni")

# Note this leads to "$root_out_dir/obj/ABS_PATH/..." files in the build.
lz4_lib = "//third_party/lz4/lib"

zx_library("lz4") {
  sdk = "source"
  sdk_headers = [
    "lz4/lz4.h",
    "lz4/lz4frame.h",
  ]

  sources = [
    "$lz4_lib/lz4.c",
    "$lz4_lib/lz4frame.c",
    "$lz4_lib/lz4hc.c",
    "$lz4_lib/xxhash.c",
  ]
  defines = [
    "XXH_NAMESPACE=LZ4_",

    # Preempt the default that will break symbols out of hidden visibility.
    "LZ4LIB_VISIBILITY=",

    # lz4frame.h doesn't let you just predefine LZ4FLIB_API like you can
    # LZ4LIB_VISIBILITY, so this kludge works with how its macros are
    # defined so the //third_party/lz4 sources don't need to be touched.
    "LZ4_DLL_IMPORT=1",
    "__declspec(x)=",
  ]

  configs += [ "//build/config:Wno-implicit-fallthrough" ]

  # TODO(https://fxbug.dev/41766): Update past https://github.com/lz4/lz4/pull/989 and remove this.
  configs += [ ":undefined_behavior_null_pointer_arithmetic" ]
}

config("undefined_behavior_null_pointer_arithmetic") {
  cflags = [ "-fno-sanitize=pointer-overflow" ]
}

group("tests") {
  testonly = true
  deps = [ "test:tests" ]
}