build/soong

commit 9a628f107015b14207990b92c92774c1fd4c2192
Author: Dhruva Krishnamurth <dhruvakm@gmail.com>
Date:   Fri Apr 13 20:22:47 2018 -0700

    Use darwin SDK on 10.13.4, stub out some warnings to avoid having to fix them

diff --git a/cc/config/clang.go b/cc/config/clang.go
index b78e1fc3..9dc221fc 100644
--- a/cc/config/clang.go
+++ b/cc/config/clang.go
@@ -115,11 +115,15 @@ func init() {
        // Turn off -Wthread-safety-negative, to avoid breaking projects that use -Weverything.
        "-D_LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS",
        "-Wno-thread-safety-negative",
+
+       // Stub to avoid fixing them on darwin
+       "-Wno-zero-as-null-pointer-constant",
+       "-Wno-tautological-constant-compare",
+       "-Wdelete-non-virtual-dtor",
    }, " "))

    pctx.StaticVariable("ClangExtraTargetCflags", strings.Join([]string{
        "-nostdlibinc",
-       "-fsanitize=local-init",
    }, " "))

    pctx.StaticVariable("ClangExtraNoOverrideCflags", strings.Join([]string{
diff --git a/cc/config/x86_darwin_host.go b/cc/config/x86_darwin_host.go
index bb751feb..ff2b3f0d 100644
--- a/cc/config/x86_darwin_host.go
+++ b/cc/config/x86_darwin_host.go
@@ -89,6 +89,7 @@ var (
        "10.10",
        "10.11",
        "10.12",
+       "10.13",
    }

    darwinAvailableLibraries = append(