Sets SONAME on shared objects in Android binaries.

Adds a linker flag to set the internal DT_SONAME. This fixes #1578 for
SDK 24 and removes the warnings for previous SDKs. There is no need to
set the linker flag for android_librarys that depend on native code,
because the linker flag will be set by the android_binarys that depend
on that android_library.

Testing is done via `readelf` executable that is shipped with the NDK.

--
Change-Id: I16fdfe6522c8694ce51554289122bf035a61d9ec
Reviewed-on: https://bazel-review.googlesource.com/#/c/4302/
MOS_MIGRATED_REVID=129920256

2 files changed, 13 insertions, 9 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/rules/android/AndroidCommon.java b/src/main/java/com/google/devtools/build/lib/rules/android/AndroidCommon.java
index 688c5c5dd6..1000216366 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/android/AndroidCommon.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/android/AndroidCommon.java
@@ -861,22 +861,25 @@ public class AndroidCommon {
   }
 
   public CcLinkParamsStore getCcLinkParamsStore() {
-    return getCcLinkParamsStore(javaCommon.targetsTreatedAsDeps(ClasspathType.BOTH));
+    return getCcLinkParamsStore(
+        javaCommon.targetsTreatedAsDeps(ClasspathType.BOTH), ImmutableList.<String>of());
   }
 
   public static CcLinkParamsStore getCcLinkParamsStore(
-      final Iterable<? extends TransitiveInfoCollection> deps) {
+      final Iterable<? extends TransitiveInfoCollection> deps, final Collection<String> linkOpts) {
     return new CcLinkParamsStore() {
       @Override
-      protected void collect(CcLinkParams.Builder builder, boolean linkingStatically,
-                             boolean linkShared) {
-        builder.addTransitiveTargets(deps,
+      protected void collect(
+          CcLinkParams.Builder builder, boolean linkingStatically, boolean linkShared) {
+        builder.addTransitiveTargets(
+            deps,
             // Link in Java-specific C++ code in the transitive closure
             JavaCcLinkParamsProvider.TO_LINK_PARAMS,
             // Link in Android-specific C++ code (e.g., android_libraries) in the transitive closure
             AndroidCcLinkParamsProvider.TO_LINK_PARAMS,
             // Link in non-language-specific C++ code in the transitive closure
             CcLinkParamsProvider.TO_LINK_PARAMS);
+        builder.addLinkOpts(linkOpts);
       }
     };
   }
diff --git a/src/main/java/com/google/devtools/build/lib/rules/android/NativeLibs.java b/src/main/java/com/google/devtools/build/lib/rules/android/NativeLibs.java
index 46446d2f31..421e8f2f53 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/android/NativeLibs.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/android/NativeLibs.java
@@ -34,14 +34,12 @@ import com.google.devtools.build.lib.rules.cpp.CppFileTypes;
 import com.google.devtools.build.lib.rules.cpp.LinkerInput;
 import com.google.devtools.build.lib.rules.nativedeps.NativeDepsHelper;
 import com.google.devtools.build.lib.vfs.PathFragment;
-
 import java.util.Collection;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.LinkedHashMap;
 import java.util.Map;
 import java.util.Set;
-
 import javax.annotation.Nullable;
 
 /** Represents the collection of native libraries (.so) to be installed in the APK. */
@@ -71,8 +69,11 @@ public final class NativeLibs {
     Map<String, Iterable<Artifact>> result = new LinkedHashMap<>();
     for (Map.Entry<String, Collection<TransitiveInfoCollection>> entry :
         depsByArchitecture.asMap().entrySet()) {
-      CcLinkParams linkParams = AndroidCommon.getCcLinkParamsStore(entry.getValue())
-          .get(/* linkingStatically */ true, /* linkShared */ true);
+      CcLinkParams linkParams =
+          AndroidCommon.getCcLinkParamsStore(
+                  entry.getValue(),
+                  ImmutableList.of("-Wl,-soname=lib" + ruleContext.getLabel().getName()))
+              .get(/* linkingStatically */ true, /* linkShared */ true);
 
       Artifact nativeDepsLibrary = NativeDepsHelper.maybeCreateAndroidNativeDepsAction(
           ruleContext, linkParams, configurationMap.get(entry.getKey()),