[NaCl SDK] Add initial support for building the SDK with gn

native_client_sdk/src/BUILD.gn

+# 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.
+
+import("//build/config/features.gni")
+
+declare_args() {
+  # Set to true if cross compiling trusted (e.g. building sel_ldr_arm on x86)
+  # binaries is supported.
+  enable_cross_trusted = is_linux
+
+  # Build the nacl SDK untrusted components.  This is disabled by default since
+  # not all NaCl untrusted compilers are in goma (e.g arm-nacl-glibc)
+  nacl_sdk_untrusted = false
+}
+
+if (enable_nacl) {
+  group("nacl_core_sdk") {
+    # Targets that get included in the NaCl SDK
+    # See: native_client_sdk/src/build_tools/build_sdk.py
+    deps = []
+    if (enable_cross_trusted ||
+        (target_cpu != "arm" && target_cpu != "mipsel")) {
+      # cross compiling trusted binaries such as sel_ldr is only currently
+      # supported on linux, and requires specific cross compilers to be
+      # installed. It can be disabled with 'disable_cross_trusted=1'
+      deps = [
+        "//native_client/src/trusted/service_runtime:sel_ldr",
+        "//native_client/src/trusted/validator/driver:ncval_new",
+      ]
+      if (is_linux) {
+        deps += [ "//native_client/src/nonsfi/loader:nonsfi_loader" ]
+      }
+    }
+    if (nacl_sdk_untrusted) {
+      deps += [
+        # elf_loader is only used on ARM
+        "//native_client/src/untrusted/elf_loader:elf_loader(//build/toolchain/nacl:clang_newlib_arm)",
+        "//native_client/src/untrusted/irt:irt_core(//build/toolchain/nacl:irt_arm)",
+        "//native_client/src/untrusted/irt:irt_core(//build/toolchain/nacl:irt_x64)",
+        "//native_client/src/untrusted/irt:irt_core(//build/toolchain/nacl:irt_x86)",
+        "//ppapi/native_client:ppapi_lib(//build/toolchain/nacl:clang_newlib_arm)",
+        "//ppapi/native_client:ppapi_lib(//build/toolchain/nacl:clang_newlib_x64)",
+        "//ppapi/native_client:ppapi_lib(//build/toolchain/nacl:clang_newlib_x86)",
+        "//ppapi/native_client:ppapi_lib(//build/toolchain/nacl:glibc_arm)",
+        "//ppapi/native_client:ppapi_lib(//build/toolchain/nacl:glibc_x64)",
+        "//ppapi/native_client:ppapi_lib(//build/toolchain/nacl:glibc_x86)",
+        "//ppapi/native_client:ppapi_lib(//build/toolchain/nacl:newlib_pnacl)",
+        "//ppapi/native_client/src/untrusted/pnacl_irt_shim:aot(//build/toolchain/nacl:clang_newlib_arm)",
+        "//ppapi/native_client/src/untrusted/pnacl_irt_shim:aot(//build/toolchain/nacl:clang_newlib_x64)",
+        "//ppapi/native_client/src/untrusted/pnacl_irt_shim:aot(//build/toolchain/nacl:clang_newlib_x86)",
+      ]
+    }
+
+    # TODO(binji): dump_syms doesn't currently build on Windows. See
+    # http://crbug.com/245456
+    if (!is_win && target_cpu == "x64") {
+      deps += [
+        "//breakpad:dump_syms($host_toolchain)",
+        "//breakpad:minidump_dump($host_toolchain)",
+        "//breakpad:minidump_stackwalk($host_toolchain)",
+      ]
+    }
+  }
+}