# Copyright 2016 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

sysroot = "fusl_${current_cpu}/sysroot"

config("libcxx_common_config") {
  cflags = [
    # Flags from upstream CMake builds.
    "-D_DEBUG",
    "-D__STDC_CONSTANT_MACROS",
    "-D__STDC_FORMAT_MACROS",
    "-D__STDC_LIMIT_MACROS",

    "-fPIC",
    "-fvisibility-inlines-hidden",

    "-Werror=return-type",

    "-Wall",

    "-Wcast-qual",
    "-Wcovered-switch-default",
    "-Wdelete-non-virtual-dtor",
    "-Wmissing-field-initializers",
    "-Wnon-virtual-dtor",
    "-Wwrite-strings",

    "-Wno-error",
    "-Wno-long-long",
    "-Wno-unused-function",

    "-std=c++11",
    "-nostdinc++",

    # Use our sysroot.
    "--sysroot=$sysroot",

    # Use musl-based libc++ header paths.
    "-D_LIBCPP_HAS_MUSL_LIBC",
  ]

  include_dirs = [
    "libcxx/include",
    "libcxxabi/include",
  ]
}

config("libcxx_config") {
  cflags = [
    # Flags from upstream CMake build.
    "-D_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER",
    "-Dcxx_EXPORTS",
    "-DLIBCXX_BUILDING_LIBCXXABI",

    "-UNDEBUG",

    "-Wno-unused-parameter",

    # Build fix for musl.
    "-Wno-invalid-constexpr",
  ]
}

config("libcxxabi_config") {
  cflags = [
    # Flags from upstream CMake build.
    "-fstrict-aliasing",

    "-Wchar-subscripts",
    "-Wconversion",
    "-Wmismatched-tags",
    "-Wmissing-braces",
    "-Wnewline-eof",
    "-Wshadow",
    "-Wshorten-64-to-32",
    "-Wsign-compare",
    "-Wsign-conversion",
    "-Wstrict-aliasing=2",
    "-Wstrict-overflow=4",
    "-Wundef",
    "-Wunused-parameter",
    "-Wunused-variable",

    "-pedantic",
  ]
}

source_set("libcxxabi_sources") {
  configs = []
  configs += [
    ":libcxxabi_config",
    ":libcxx_common_config",
  ]

  deps = [
    "//fusl:copy_sysroot",
  ]

  sources = [
    "libcxxabi/src/abort_message.cpp",
    "libcxxabi/src/cxa_aux_runtime.cpp",
    "libcxxabi/src/cxa_default_handlers.cpp",
    "libcxxabi/src/cxa_demangle.cpp",
    "libcxxabi/src/cxa_exception.cpp",
    "libcxxabi/src/cxa_exception_storage.cpp",
    "libcxxabi/src/cxa_guard.cpp",
    "libcxxabi/src/cxa_handlers.cpp",
    "libcxxabi/src/cxa_new_delete.cpp",
    "libcxxabi/src/cxa_personality.cpp",
    "libcxxabi/src/cxa_thread_atexit.cpp",
    "libcxxabi/src/cxa_unexpected.cpp",
    "libcxxabi/src/cxa_vector.cpp",
    "libcxxabi/src/cxa_virtual.cpp",
    "libcxxabi/src/exception.cpp",
    "libcxxabi/src/private_typeinfo.cpp",
    "libcxxabi/src/stdexcept.cpp",
    "libcxxabi/src/typeinfo.cpp",
  ]
}

source_set("libcxx_sources") {
  configs = []
  configs += [
    ":libcxx_config",
    ":libcxx_common_config",
  ]

  deps = [
    "//fusl:copy_sysroot",
  ]

  sources = [
    "libcxx/src/algorithm.cpp",
    "libcxx/src/any.cpp",
    "libcxx/src/bind.cpp",
    "libcxx/src/chrono.cpp",
    "libcxx/src/condition_variable.cpp",
    "libcxx/src/debug.cpp",
    "libcxx/src/exception.cpp",
    "libcxx/src/future.cpp",
    "libcxx/src/hash.cpp",
    "libcxx/src/ios.cpp",
    "libcxx/src/iostream.cpp",
    "libcxx/src/locale.cpp",
    "libcxx/src/memory.cpp",
    "libcxx/src/mutex.cpp",
    "libcxx/src/new.cpp",
    "libcxx/src/optional.cpp",
    "libcxx/src/random.cpp",
    "libcxx/src/regex.cpp",
    "libcxx/src/shared_mutex.cpp",
    "libcxx/src/stdexcept.cpp",
    "libcxx/src/string.cpp",
    "libcxx/src/strstream.cpp",
    "libcxx/src/system_error.cpp",
    "libcxx/src/thread.cpp",
    "libcxx/src/typeinfo.cpp",
    "libcxx/src/utility.cpp",
    "libcxx/src/valarray.cpp",
  ]
}

static_library("libcxx") {
  complete_static_lib = true

  deps = [
    ":libcxx_sources",
    ":libcxxabi_sources",
  ]
}

action("generate_libcxx_lit") {
  script = "generate_lit.py"

  template_file = "libcxx/test/lit.site.cfg.in"
  output_file = "$target_out_dir/lit.site.cfg"

  sysroot = rebase_path(sysroot)
  cxx = rebase_path("//third_party/llvm-build/Release+Asserts/bin/clang++")
  main_lit_config = rebase_path("libcxx")

  args = [
    rebase_path(template_file),
    rebase_path(output_file),

    "AUTO_GEN_COMMENT=# Automatically generated by gn.",
    "LIBCXX_COMPILER=$cxx",
    "CMAKE_BINARY_DIR=$sysroot",
    "LIBCXX_SOURCE_DIR=$main_lit_config",
    "LIBCXX_BINARY_DIR=$sysroot",
    "LIBCXX_LIBRARY_DIR=$sysroot/lib",
    "LIBCXX_ENABLE_EXCEPTIONS=True",
    "LIBCXX_ENABLE_RTTI=True",
    "LIBCXX_ENABLE_SHARED=True",
    "LIBCXX_BUILD_32_BITS=False",
    "LIBCXX_CXX_ABI_LIBNAME=none",
    "LLVM_USE_SANITIZER=",
    "LIBCXX_SANITIZER_LIBRARY=",
    "LIBCXX_CXX_ABI_LIBRARY_PATH=",
    "LIBCXX_LIT_VARIANT=libcxx",
    "LIBCXX_TARGET_TRIPLE=",
    "LIBCXX_SYSROOT=$sysroot",
    "LIBCXX_GCC_TOOLCHAIN=",
    "LIBCXX_GENERATE_COVERAGE=False",
    "LIBCXX_TARGET_INFO=libcxx.test.target_info.LocalTI",
    "LIBCXX_EXECUTOR=None",
    "LIBCXXABI_USE_LLVM_UNWINDER=False",
  ]

  outputs = [
    output_file,
  ]
}