import("//clang/runtimes.gni")

declare_args() {
  # Build libunwind as a shared library.
  libunwind_enable_shared = true

  # Build libunwind as a static library.
  libunwind_enable_static = true

  # Do not export any symbols from the static library.
  libunwind_hermetic_static_library = true
}

unwind_headers = [
  "../include/libunwind.h",
  "../include/unwind.h",
]
if (target_os == "mac") {
  unwind_headers += [
    # Make `gn format` not collapse this, for sync_source_lists_from_cmake.py.
    "../include/mach-o/compact_unwind_encoding.h",
  ]
}

unwind_sources = [
  "AddressSpace.hpp",
  "CompactUnwinder.hpp",
  "DwarfInstructions.hpp",
  "DwarfParser.hpp",
  "RWMutex.hpp",
  "Registers.hpp",
  "Unwind-EHABI.cpp",
  "Unwind-EHABI.h",
  "Unwind-seh.cpp",
  "Unwind-sjlj.c",
  "UnwindCursor.hpp",
  "UnwindLevel1-gcc-ext.c",
  "UnwindLevel1.c",
  "UnwindRegistersRestore.S",
  "UnwindRegistersSave.S",
  "assembly.h",
  "config.h",
  "dwarf2.h",
  "libunwind.cpp",
  "libunwind_ext.h",
]
if (target_os == "mac") {
  unwind_sources += [ "Unwind_AppleExtras.cpp" ]
}

config("unwind_config") {
  cflags = []
  cflags_c = [ "-std=c99" ]
  cflags_cc = [ "-fno-rtti" ]
  include_dirs = [ "//libunwind/include" ]
  if (target_os == "mac") {
    cflags += [ "-U__STRICT_ANSI__" ]
  }
}

if (libunwind_enable_shared) {
  shared_library("unwind_shared") {
    output_dir = runtimes_dir
    output_name = "unwind"
    if (target_os == "linux" || target_os == "mac") {
      cflags = [ "-fPIC" ]
      ldflags = [ "-nostdlib++" ]
      libs = [
        "dl",
        "pthread",
      ]
    }
    if (target_os == "mac") {
      ldflags += [
        "-compatibility_version 1",
        "-install_name /usr/lib/libunwind.1.dylib",
      ]
    }
    sources = unwind_sources
    public = unwind_headers
    deps = [ "//compiler-rt/lib/builtins" ]
    configs += [ ":unwind_config" ]
    configs -= [
      "//llvm/utils/gn/build:no_exceptions",
      "//llvm/utils/gn/build:no_rtti",
    ]
  }
}

if (libunwind_enable_static) {
  static_library("unwind_static") {
    output_dir = runtimes_dir
    output_name = "unwind"
    complete_static_lib = true
    configs -= [ "//llvm/utils/gn/build:thin_archive" ]
    sources = unwind_sources
    public = unwind_headers
    if (libunwind_hermetic_static_library) {
      cflags = [ "-fvisibility=hidden" ]
      cflags_cc = [ "-fvisibility-global-new-delete-hidden" ]
      defines = [ "_LIBUNWIND_DISABLE_VISIBILITY_ANNOTATIONS" ]
    }
    deps = [ "//compiler-rt/lib/builtins" ]
    configs += [ ":unwind_config" ]
    configs -= [
      "//llvm/utils/gn/build:no_exceptions",
      "//llvm/utils/gn/build:no_rtti",
    ]
  }
}

group("src") {
  deps = []
  if (libunwind_enable_shared) {
    deps += [ ":unwind_shared" ]
  }
  if (libunwind_enable_static) {
    deps += [ ":unwind_static" ]
  }
}