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++"
  }

  windk = ""

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

  compiler_prefix = ""
}

if (is_win) {
  config("default") {
    cflags = [
      "/FS",      # Preserve previous PDB behavior.
      "/bigobj",  # Some of our files are bigger than the regular limits.
    ]
    cflags_c = ["/TC"]
    cflags_cc = ["/TP"]
    defines = [
          "_HAS_EXCEPTIONS=0",
          "WIN32_LEAN_AND_MEAN",
          "NOMINMAX",
    ]
  }
  config("no_rtti") { }

  config("debug_symbols") { }

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

  config("default") {
    asmflags = []
    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",
      ]
    } else if (current_cpu == "x86") {
      asmflags += [ "-m32" ]
      cflags += [
        "-m32",
        "-msse2",
        "-mfpmath=sse",
      ]
      ldflags += [ "-m32" ]
    }

    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("msvc") {
  vc    = "$windk\VC\bin\amd64\cl.exe"
  vlink = "$windk\VC\bin\amd64\link.exe"
  vlib  = "$windk\VC\bin\amd64\lib.exe"
  # TODO: add a python function that generates the includes using <VSPATH>/win_sdk/bin/SetEnv.<cpu>.json
  windk_include_dirs = "/I$windk\win_sdk\bin\..\..\win_sdk\Include\10.0.10586.0\um /I$windk\win_sdk\bin\..\..\win_sdk\Include\10.0.10586.0\shared /I$windk\win_sdk\bin\..\..\win_sdk\Include\10.0.10586.0\winrt /I$windk\win_sdk\bin\..\..\win_sdk\Include\10.0.10586.0\ucrt /I$windk\win_sdk\bin\..\..\VC\include /I$windk\win_sdk\bin\..\..\VC\atlmfc\include "

  tool("cc") {
    rspfile = "{{output}}.rsp"
    precompiled_header_type = "msvc"
    pdbname = "{{target_out_dir}}/{{label_name}}_c.pdb"

    # Label names may have spaces in them so the pdbname must be quoted. The
    # source and output don't need to be quoted because GN knows they're a
    # full file name and will quote automatically when necessary.
   
    command = "$vc /nologo /showIncludes /FC @$rspfile /c {{source}} /Fo{{output}} /Fd\"$pdbname\""
    depsformat = "msvc"
    description = "CC {{output}}"
    outputs = [
      "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.obj",
      # "$object_subdir/{{source_name_part}}.obj",
    ]
    rspfile_content = "$windk_include_dirs {{defines}} {{include_dirs}} {{cflags}} {{cflags_c}}"
  }

  tool("cxx") {
    rspfile = "{{output}}.rsp"
    precompiled_header_type = "msvc"
    pdbname = "{{target_out_dir}}/{{label_name}}_c.pdb"

    # Label names may have spaces in them so the pdbname must be quoted. The
    # source and output don't need to be quoted because GN knows they're a
    # full file name and will quote automatically when necessary.
    command = "$vc /nologo /showIncludes /FC @$rspfile /c {{source}} /Fo{{output}} /Fd\"$pdbname\""
    depsformat = "msvc"
    description = "C++ {{output}}"
    outputs = [
      "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.obj",
    ]
    rspfile_content = "$windk_include_dirs {{defines}} {{include_dirs}} {{cflags}} {{cflags_cc}}"
  }    

  tool("alink") {
    rspfile = "{{output}}.rsp"
    # gyp_win_tool_path = rebase_path("../third_party/externals/gyp/pylib/gyp/win_tool.py")
    command = "$vlib /nologo {{arflags}} /OUT:{{output}} @$rspfile"
    description = "LIB {{output}}"
    outputs = [
      # Ignore {{output_extension}} and always use .lib, there's no reason to
      # allow targets to override this extension on Windows.
      "{{root_out_dir}}/{{target_output_name}}{{output_extension}}",
    ]
    default_output_extension = ".lib"
    default_output_dir = "{{target_out_dir}}"

    # The use of inputs_newline is to work around a fixed per-line buffer
    # size in the linker.
    rspfile_content = "{{inputs_newline}}"
  }

  tool("link") {
    exename = "{{root_out_dir}}/{{target_output_name}}{{output_extension}}"
    pdbname = "$exename.pdb"
    rspfile = "$exename.rsp"

    # gyp_win_tool_path = rebase_path("../third_party/externals/gyp/pylib/gyp/win_tool.py")
    command = "$vlink /nologo /OUT:$exename /PDB:$pdbname @$rspfile"

    default_output_extension = ".exe"
    default_output_dir = "{{root_out_dir}}"
    description = "LINK {{output}}"
    outputs = [
      #"{{root_out_dir}}/{{target_output_name}}{{output_extension}}",
      exename,
    ]
    #if (symbol_level != 0) {
    #  outputs += [ pdbname ]
    #}
    #runtime_outputs = outputs

    # The use of inputs_newline is to work around a fixed per-line buffer
    # size in the linker.
    rspfile_content = "{{inputs_newline}} {{libs}} {{solibs}} {{ldflags}}"
  }


  tool("stamp") {
    win_stamp_path = rebase_path("win_stamp.py")
    command = "python $win_stamp_path {{output}}"
  }
}


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}})"
  }
}