Convert libart and dependencies to Android.bp

Re-landing I73839046a5a53eb34cd28eea53149911c568e411, with fixes for mac
build (only apply -Wl,--keep-unique to device x86 builds), typo in
checking for ART_HEAP_POISONING environment variable, and removing
-Wframe-larger-than for debug builds.

Test: mma -j, m -j test-art-host
Change-Id: If88492174cbcb0d9a8758176c006163a29eaaa63
diff --git a/sigchainlib/Android.bp b/sigchainlib/Android.bp
new file mode 100644
index 0000000..08af254
--- /dev/null
+++ b/sigchainlib/Android.bp
@@ -0,0 +1,53 @@
+//
+// Copyright (C) 2014 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+cc_library {
+    name: "libsigchain",
+    host_supported: true,
+    defaults: ["art_defaults"],
+    shared: {
+        srcs: ["sigchain_dummy.cc"],
+    },
+    static: {
+        srcs: ["sigchain.cc"],
+    },
+    target: {
+        host: {
+            host_ldlibs: ["-ldl"],
+        },
+        android: {
+            shared_libs: ["liblog"],
+        },
+    },
+}
+
+// Create a dummy version of libsigchain which expose the necessary symbols
+// but throws when called. This can be used to get static binaries which don't
+// need the real functionality of the sig chain but need to please the linker.
+cc_library_static {
+    name: "libsigchain_dummy",
+    host_supported: true,
+    defaults: ["art_defaults"],
+    srcs: ["sigchain_dummy.cc"],
+    target: {
+        host: {
+            host_ldlibs: ["-ldl"],
+        },
+        android: {
+            shared_libs: ["liblog"],
+        },
+    },
+}