gn/BUILD.gn

# Copyright 2016 Google Inc.
#
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

declare_args() {
  ar = "ar"
  cc = "cc"
  cxx = "c++"

  if (is_android) {
    ar = "$ndk/toolchains/$ndk_gccdir-4.9/prebuilt/$ndk_host/$ndk_target/bin/ar"
    cc = "$ndk/toolchains/llvm/prebuilt/$ndk_host/bin/clang"
    cxx = "$ndk/toolchains/llvm/prebuilt/$ndk_host/bin/clang++"
  }

  extra_cflags = ""
  extra_cflags_c = ""
  extra_cflags_cc = ""
  extra_ldflags = ""

  compiler_prefix = ""
}

config("no_rtti") {
  if (sanitize != "ASAN") {  # -fsanitize=vptr requires RTTI
    cflags_cc = [ "-fno-rtti" ]
  }
}

config("debug_symbols") {
  # It's annoying to wait for full debug symbols to push over
  # to Android devices.  -gline-tables-only is a lot slimmer.
  if (is_android) {
    cflags = [ "-gline-tables-only" ]
  } else {
    cflags = [ "-g" ]
  }
}

config("default") {
  cflags = [
    "-O1",
    "-fstrict-aliasing",
    "-fPIC",
    "-fvisibility=hidden",

    "-Werror",
    "-Wall",
    "-Wextra",
    "-Winit-self",
    "-Wpointer-arith",
    "-Wsign-compare",
    "-Wvla",

    "-Wno-deprecated-declarations",
    "-Wno-unused-parameter",
  ]
  cflags_cc = [
    "-std=c++11",
    "-fno-exceptions",
    "-fno-threadsafe-statics",
    "-fvisibility-inlines-hidden",

    "-Wnon-virtual-dtor",
  ]
  ldflags = []

  if (current_cpu == "arm") {
    cflags += [
      "-march=armv7-a",
      "-mfpu=neon",
      "-mthumb",
    ]
  } else if (current_cpu == "mipsel") {
    cflags += [
      "-march=mips32r2",
      "-mdspr2",
    ]
  }

  if (is_android) {
    asmflags = [
      "--target=$ndk_target",
      "-B$ndk/toolchains/$ndk_gccdir-4.9/prebuilt/$ndk_host/$ndk_target/bin",
    ]
    cflags += [
      "--sysroot=$ndk/platforms/$ndk_platform",
      "--target=$ndk_target",
      "-B$ndk/toolchains/$ndk_gccdir-4.9/prebuilt/$ndk_host/$ndk_target/bin",
    ]
    cflags_cc += [
      "-isystem$ndk/sources/android/support/include",
      "-isystem$ndk/sources/cxx-stl/llvm-libc++/libcxx/include",
    ]
    ldflags += [
      "--sysroot=$ndk/platforms/$ndk_platform",
      "--target=$ndk_target",
      "-B$ndk/toolchains/$ndk_gccdir-4.9/prebuilt/$ndk_host/$ndk_target/bin",
      "-pie",
    ]
    lib_dirs = [
      "$ndk/sources/cxx-stl/llvm-libc++/libs/$ndk_stdlib",
      "$ndk/toolchains/$ndk_gccdir-4.9/prebuilt/$ndk_host/lib/gcc/$ndk_target/4.9.x",
    ]
    libs = [
      # Order matters here!  Keep these three in exactly this order.
      "c++_static",
      "c++abi",
      "android_support",
    ]
    if (target_cpu == "arm") {
      libs += [ "unwind" ]
    }
  }

  if (is_linux) {
    libs = [ "pthread" ]
  }

  if (sanitize != "") {
    # You can either pass the sanitizers directly, e.g. "address,undefined",
    # or pass one of the couple common aliases used by the bots.
    sanitizers = sanitize
    if (sanitize == "ASAN") {
      sanitizers = "address,bool,function,integer-divide-by-zero,nonnull-attribute,null,object-size,return,returns-nonnull-attribute,shift,signed-integer-overflow,unreachable,vla-bound,vptr"
    } else if (sanitize == "TSAN") {
      sanitizers = "thread"
    } else if (sanitize == "MSAN") {
      sanitizers = "memory"
    }

    cflags += [
      "-fsanitize=$sanitizers",
      "-fno-sanitize-recover=$sanitizers",
      "-fsanitize-blacklist=" + rebase_path("../tools/xsan.blacklist"),
    ]
    ldflags += [ "-fsanitize=$sanitizers" ]
    if (sanitizers == "memory") {
      cflags += [ "-fsanitize-memory-track-origins" ]
      cflags_cc += [ "-stdlib=libc++" ]
      ldflags += [ "-stdlib=libc++" ]
    }
  }
}

config("release") {
  cflags = [ "-O3" ]
  defines = [ "NDEBUG" ]
}

config("executable") {
  if (is_mac) {
    ldflags = [ "-Wl,-rpath,@loader_path/." ]
  } else if (is_linux) {
    ldflags = [
      "-rdynamic",
      "-Wl,-rpath,\$ORIGIN",
    ]
  }
}

toolchain("gcc_like") {
  lib_switch = "-l"
  lib_dir_switch = "-L"

  tool("cc") {
    depfile = "{{output}}.d"
    command = "$compiler_prefix $cc -MMD -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_c}} $extra_cflags $extra_cflags_c -c {{source}} -o {{output}}"
    depsformat = "gcc"
    outputs = [
      "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o",
    ]
    description =
        "$compiler_prefix $cc ... $extra_cflags $extra_cflags_c -o {{output}}"
  }

  tool("cxx") {
    depfile = "{{output}}.d"
    command = "$compiler_prefix $cxx -MMD -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_cc}} $extra_cflags $extra_cflags_cc -c {{source}} -o {{output}}"
    depsformat = "gcc"
    outputs = [
      "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o",
    ]
    description =
        "$compiler_prefix $cxx ... $extra_cflags $extra_cflags_cc -o {{output}}"
  }

  tool("asm") {
    depfile = "{{output}}.d"
    command = "$compiler_prefix $cc -MMD -MF $depfile {{defines}} {{include_dirs}} {{asmflags}} -c {{source}} -o {{output}}"
    depsformat = "gcc"
    outputs = [
      "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o",
    ]
    description = "$compiler_prefix $cc ... -o {{output}}"
  }

  tool("alink") {
    command = "rm -f {{output}} && $ar rcs {{output}} {{inputs}}"
    outputs = [
      "{{root_out_dir}}/{{target_output_name}}{{output_extension}}",
    ]
    default_output_extension = ".a"
    output_prefix = "lib"
    description = "$ar {{output}} ..."
  }

  tool("solink") {
    soname = "{{target_output_name}}{{output_extension}}"

    rpath = "-Wl,-soname,$soname"
    if (is_mac) {
      rpath = "-Wl,-install_name,@rpath/$soname"
    }

    command = "$compiler_prefix $cxx -shared {{ldflags}} {{inputs}} {{solibs}} {{libs}} $rpath $extra_ldflags -o {{output}}"
    outputs = [
      "{{root_out_dir}}/$soname",
    ]
    output_prefix = "lib"
    default_output_extension = ".so"
    description =
        "$compiler_prefix $cxx -shared ... $extra_ldflags -o {{output}}"
  }

  tool("link") {
    command = "$compiler_prefix $cxx {{ldflags}} {{inputs}} {{solibs}} {{libs}} $extra_ldflags -o {{output}}"
    outputs = [
      "{{root_out_dir}}/{{target_output_name}}{{output_extension}}",
    ]
    description = "$compiler_prefix $cxx ... $extra_ldflags -o {{output}}"
  }

  tool("stamp") {
    command = "touch {{output}}"
  }

  tool("copy") {
    command = "ln -f {{source}} {{output}} 2>/dev/null || (rm -rf {{output}} && cp -af {{source}} {{output}})"
  }
}