# 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.

# Define the sysroot directory.
sysroot = "$root_out_dir/sysroot"
sysroot_lib_dir = "${sysroot}/usr/lib"
sysroot_include_dir = "${sysroot}/usr/include"
sysroot_include_bits_dir = "${sysroot}/usr/include/bits"

config("fusl_config") {
  cflags = [
    # Flags from musl
    "-std=c99",
    "-ffreestanding",
    "-nostdinc",

    "-D_XOPEN_SOURCE=700",

    "-Wa,--noexecstack",

    "-fomit-frame-pointer",
    "-fno-unwind-tables",
    "-fno-asynchronous-unwind-tables",
    "-ffunction-sections",
    "-fdata-sections",
    "-Werror=implicit-function-declaration",
    "-Werror=implicit-int",
    "-Werror=pointer-sign",
    "-Werror=pointer-arith",
  ]

  include_dirs = []

  # Arch specific includes, these need to come before the general includes.
  if (current_cpu == "x64") {
    include_dirs += [ "arch/x86_64" ]
  }

  # General includes, these need to come after the arch specific includes.
  # src/internal must come before include.
  include_dirs += [
    "arch/generic",
    "src/internal",
    "include",
  ]
}

config("fusl_no_stack_protector_config") {
  cflags = [ "-fno-stack-protector" ]
}

static_library("libc") {
  configs = []
  configs += [ ":fusl_config" ]

  complete_static_lib = true

  deps = [
    "ldso",
    "src/aio",
    "src/complex",
    "src/conf",
    "src/crypt",
    "src/ctype",
    "src/dirent",
    "src/env",
    "src/errno",
    "src/exit",
    "src/fcntl",
    "src/fenv",
    "src/internal",
    "src/ipc",
    "src/ldso",
    "src/legacy",
    "src/linux",
    "src/locale",
    "src/malloc",
    "src/math",
    "src/misc",
    "src/mman",
    "src/mq",
    "src/multibyte",
    "src/network",
    "src/passwd",
    "src/prng",
    "src/process",
    "src/regex",
    "src/sched",
    "src/search",
    "src/select",
    "src/setjmp",
    "src/signal",
    "src/stat",
    "src/stdio",
    "src/stdlib",
    "src/string",
    "src/temp",
    "src/termios",
    "src/thread",
    "src/time",
    "src/unistd",
  ]
}

# For simplicity, musl places all its symbols in libc. To support
# linking against e.g. libm, either implicitly or with an explicit -lm
# flag, we build empty libraries.
static_library("libm") {
  complete_static_lib = true
}

copy("copy_include") {
  sources = [
    "include",
  ]
  outputs = [
    "${sysroot_include_dir}",
  ]
}

copy("copy_arch_include_bits") {
  deps = [
    ":copy_include",
  ]
  if (current_cpu == "x64") {
    sources = [
      "arch/generic/bits/errno.h",
      "arch/generic/bits/poll.h",
      "arch/generic/bits/resource.h",
      "arch/generic/bits/sem.h",
      "arch/generic/bits/statfs.h",
      "arch/generic/bits/stdarg.h",
      "arch/generic/bits/termios.h",
      "arch/x86_64/bits/alltypes.h",
      "arch/x86_64/bits/endian.h",
      "arch/x86_64/bits/fcntl.h",
      "arch/x86_64/bits/fenv.h",
      "arch/x86_64/bits/float.h",
      "arch/x86_64/bits/io.h",
      "arch/x86_64/bits/ioctl.h",
      "arch/x86_64/bits/ipc.h",
      "arch/x86_64/bits/limits.h",
      "arch/x86_64/bits/mman.h",
      "arch/x86_64/bits/msg.h",
      "arch/x86_64/bits/posix.h",
      "arch/x86_64/bits/reg.h",
      "arch/x86_64/bits/setjmp.h",
      "arch/x86_64/bits/shm.h",
      "arch/x86_64/bits/signal.h",
      "arch/x86_64/bits/socket.h",
      "arch/x86_64/bits/stat.h",
      "arch/x86_64/bits/stdint.h",
      "arch/x86_64/bits/syscall.h",
      "arch/x86_64/bits/user.h",
    ]
  }
  outputs = [
    "${sysroot_include_bits_dir}/{{source_name_part}}.h",
  ]
}

copy("copy_libs") {
  deps = [
    ":libc",
    ":libm",
  ]
  sources = [
    "${target_out_dir}/libc.a",
    "${target_out_dir}/libm.a",
  ]
  outputs = [
    "${sysroot_lib_dir}/{{source_name_part}}.a",
  ]
}

group("copy_sysroot") {
  deps = [
    ":copy_arch_include_bits",
    ":copy_include",
    ":copy_libs",
    "crt:copy_crt_objects",
  ]
}

copy("copy_libcxx") {
  sources = [
    "${target_out_dir}/../third_party/libcxx/libcxx.a",
  ]
  outputs = [
    "${sysroot_lib_dir}/libc++.a",
  ]
  deps = [
    "//third_party/libcxx:libcxx",
  ]
}

action("copy_libcxx_headers") {
  script = "tools/copy_libcxx_headers.py"

  deps = [
    ":copy_sysroot",
  ]

  source_dir = "//third_party/libcxx/libcxx/include"

  # Annoyingly, this has to be ".../c++/v1" for clang to automatically
  # add it to the includes.
  target_dir = "${sysroot_include_dir}/c++/v1"

  args = [
    rebase_path(source_dir),
    rebase_path(target_dir),
  ]

  outputs = [
    "${target_dir}/__bit_reference",
    "${target_dir}/__config",
    "${target_dir}/__config_site.in",
    "${target_dir}/__debug",
    "${target_dir}/__functional_03",
    "${target_dir}/__functional_base",
    "${target_dir}/__functional_base_03",
    "${target_dir}/__hash_table",
    "${target_dir}/__locale",
    "${target_dir}/__mutex_base",
    "${target_dir}/__nullptr",
    "${target_dir}/__refstring",
    "${target_dir}/__split_buffer",
    "${target_dir}/__sso_allocator",
    "${target_dir}/__std_stream",
    "${target_dir}/__tree",
    "${target_dir}/__tuple",
    "${target_dir}/__undef___deallocate",
    "${target_dir}/__undef_min_max",
    "${target_dir}/algorithm",
    "${target_dir}/array",
    "${target_dir}/atomic",
    "${target_dir}/bitset",
    "${target_dir}/cassert",
    "${target_dir}/ccomplex",
    "${target_dir}/cctype",
    "${target_dir}/cerrno",
    "${target_dir}/cfenv",
    "${target_dir}/cfloat",
    "${target_dir}/chrono",
    "${target_dir}/cinttypes",
    "${target_dir}/ciso646",
    "${target_dir}/climits",
    "${target_dir}/clocale",
    "${target_dir}/cmath",
    "${target_dir}/codecvt",
    "${target_dir}/complex",
    "${target_dir}/complex.h",
    "${target_dir}/condition_variable",
    "${target_dir}/csetjmp",
    "${target_dir}/csignal",
    "${target_dir}/cstdarg",
    "${target_dir}/cstdbool",
    "${target_dir}/cstddef",
    "${target_dir}/cstdint",
    "${target_dir}/cstdio",
    "${target_dir}/cstdlib",
    "${target_dir}/cstring",
    "${target_dir}/ctgmath",
    "${target_dir}/ctime",
    "${target_dir}/ctype.h",
    "${target_dir}/cwchar",
    "${target_dir}/cwctype",
    "${target_dir}/deque",
    "${target_dir}/errno.h",
    "${target_dir}/exception",
    "${target_dir}/experimental/__config",
    "${target_dir}/experimental/algorithm",
    "${target_dir}/experimental/any",
    "${target_dir}/experimental/chrono",
    "${target_dir}/experimental/dynarray",
    "${target_dir}/experimental/functional",
    "${target_dir}/experimental/optional",
    "${target_dir}/experimental/ratio",
    "${target_dir}/experimental/string_view",
    "${target_dir}/experimental/system_error",
    "${target_dir}/experimental/tuple",
    "${target_dir}/experimental/type_traits",
    "${target_dir}/experimental/utility",
    "${target_dir}/ext/__hash",
    "${target_dir}/ext/hash_map",
    "${target_dir}/ext/hash_set",
    "${target_dir}/float.h",
    "${target_dir}/forward_list",
    "${target_dir}/fstream",
    "${target_dir}/functional",
    "${target_dir}/future",
    "${target_dir}/initializer_list",
    "${target_dir}/inttypes.h",
    "${target_dir}/iomanip",
    "${target_dir}/ios",
    "${target_dir}/iosfwd",
    "${target_dir}/iostream",
    "${target_dir}/istream",
    "${target_dir}/iterator",
    "${target_dir}/limits",
    "${target_dir}/list",
    "${target_dir}/locale",
    "${target_dir}/map",
    "${target_dir}/math.h",
    "${target_dir}/memory",
    "${target_dir}/module.modulemap",
    "${target_dir}/mutex",
    "${target_dir}/new",
    "${target_dir}/numeric",
    "${target_dir}/ostream",
    "${target_dir}/queue",
    "${target_dir}/random",
    "${target_dir}/ratio",
    "${target_dir}/regex",
    "${target_dir}/scoped_allocator",
    "${target_dir}/set",
    "${target_dir}/setjmp.h",
    "${target_dir}/shared_mutex",
    "${target_dir}/sstream",
    "${target_dir}/stack",
    "${target_dir}/stddef.h",
    "${target_dir}/stdexcept",
    "${target_dir}/stdio.h",
    "${target_dir}/stdlib.h",
    "${target_dir}/streambuf",
    "${target_dir}/string",
    "${target_dir}/strstream",
    "${target_dir}/support/android/locale_bionic.h",
    "${target_dir}/support/ibm/limits.h",
    "${target_dir}/support/ibm/support.h",
    "${target_dir}/support/ibm/xlocale.h",
    "${target_dir}/support/musl/xlocale.h",
    "${target_dir}/support/newlib/xlocale.h",
    "${target_dir}/support/solaris/floatingpoint.h",
    "${target_dir}/support/solaris/wchar.h",
    "${target_dir}/support/solaris/xlocale.h",
    "${target_dir}/support/win32/limits_win32.h",
    "${target_dir}/support/win32/locale_win32.h",
    "${target_dir}/support/win32/math_win32.h",
    "${target_dir}/support/win32/support.h",
    "${target_dir}/support/xlocale/xlocale.h",
    "${target_dir}/system_error",
    "${target_dir}/tgmath.h",
    "${target_dir}/thread",
    "${target_dir}/tuple",
    "${target_dir}/type_traits",
    "${target_dir}/typeindex",
    "${target_dir}/typeinfo",
    "${target_dir}/unordered_map",
    "${target_dir}/unordered_set",
    "${target_dir}/utility",
    "${target_dir}/valarray",
    "${target_dir}/vector",
    "${target_dir}/wchar.h",
    "${target_dir}/wctype.h",
  ]
}

config("fusl_sysroot_config") {
  rebased_sysroot = rebase_path(sysroot)

  cflags = [
    "--sysroot=$rebased_sysroot",
    "-fPIC",
    "-static",
  ]

  cflags_c = [ "-std=c11" ]

  cflags_cc = [
    "-std=c++11",

    # Make everyone using our libc++ headers use musl paths rather
    # than glibc ones.
    "-D_LIBCPP_HAS_MUSL_LIBC",

    # This is necessary for clang to get the header search paths right.
    "-stdlib=libc++",
  ]

  ldflags = [
    "--sysroot=$rebased_sysroot",
    "-static",
    "-stdlib=libc++",
  ]
}

config("fusl_sysroot_config_c") {
  ldflags = [
    # Using clang++ as the linker driver is necessary for libc++
    # resolution to work.
    "-nodefaultlibs",
    "-lc",
  ]
}

executable("empty_main") {
  configs = []
  configs += [
    ":fusl_sysroot_config",
    ":fusl_sysroot_config_c",
  ]

  sources = [
    "test/empty_main.c",
  ]

  deps = [
    ":copy_sysroot",
  ]
}

executable("vector") {
  configs = []
  configs += [ ":fusl_sysroot_config" ]

  sources = [
    "test/vector.cc",
  ]

  deps = [
    ":copy_libcxx",
    ":copy_libcxx_headers",
  ]
}

group("fusl_pre_toolchain") {
  deps = [
    ":copy_sysroot",
    ":empty_main",
    ":libc",
    ":vector",
    "crt",
    "//third_party/libcxx:libcxx",
  ]
}

group("fusl") {
  deps = [
    ":fusl_pre_toolchain(//build/toolchain/fusl:fusl_$current_cpu)",
  ]
}