Subtract imported_library in subtractSubtrees

This is needed for some upcoming changes to migrate linking info to CcInfo.
During the migration we will put the linking info in both CcInfo and
ObjcProvider, and it is possible in some code path (through swift_library, fwiw)
for an imported_library to become a regular library.  For avoid_deps to work,
avoid_deps needs to add imported_library to the list of libraries to subtract.

PiperOrigin-RevId: 490275745
Change-Id: I013950a2ffe988013ca1613d8b7802ca379d3170

Author: googlewalt

src/main/java/com/google/devtools/build/lib/rules/objc/ObjcProvider.java

@@ -560,6 +560,9 @@ public ObjcProvider subtractSubtrees(
       for (Artifact libraryToAvoid : avoidProvider.getPropagable(LIBRARY).toList()) {
         avoidLibrariesSet.add(libraryToAvoid.getRunfilesPath());
       }
+      for (Artifact libraryToAvoid : avoidProvider.getPropagable(IMPORTED_LIBRARY).toList()) {
+        avoidLibrariesSet.add(libraryToAvoid.getRunfilesPath());
+      }
     }
     ObjcProvider.Builder objcProviderBuilder = new ObjcProvider.Builder(semantics);
     for (Key<?> key : items.keySet()) {

src/test/java/com/google/devtools/build/lib/rules/objc/AppleBinaryStarlarkApiTest.java

@@ -565,6 +565,11 @@ public void testAvoidDepsObjects_avoidViaCcLibrary() throws Exception {
     checkAvoidDepsObjects_avoidViaCcLibrary(getRuleType());
   }
 
+  @Test
+  public void testAvoidDepsSubtractsImportedLibrary() throws Exception {
+    checkAvoidDepsSubtractsImportedLibrary(getRuleType());
+  }
+
   @Test
   public void testBundleLoaderIsCorrectlyPassedToTheLinker() throws Exception {
     checkBundleLoaderIsCorrectlyPassedToTheLinker(getRuleType());

src/test/java/com/google/devtools/build/lib/rules/objc/AppleDynamicLibraryTest.java

@@ -118,6 +118,12 @@ public void testAvoidDepsObjects_avoidViaCcLibrary() throws Exception {
     checkAvoidDepsObjects_avoidViaCcLibrary(RULE_TYPE);
   }
 
+  @Override
+  @Test
+  public void testAvoidDepsSubtractsImportedLibrary() throws Exception {
+    checkAvoidDepsSubtractsImportedLibrary(RULE_TYPE);
+  }
+
   @Override
   @Test
   public void testLipoBinaryAction() throws Exception {

src/test/java/com/google/devtools/build/lib/rules/objc/ObjcRuleTestCase.java

@@ -1777,6 +1777,67 @@ public void checkAvoidDepsObjects_avoidViaCcLibrary(RuleType ruleType) throws Ex
         .isNull();
   }
 
+  public void checkAvoidDepsSubtractsImportedLibrary(RuleType ruleType) throws Exception {
+    if (!ruleType.getRuleTypeName().equals("apple_binary_starlark")) {
+      addAppleBinaryStarlarkRule(scratch);
+    }
+
+    ruleType.scratchTarget(
+        scratch, "deps", "['//libs:objc_lib']", "avoid_deps", "['//libs:objc_avoid_lib']");
+
+    scratch.file(
+        "libs/defs.bzl",
+        "def _custom_library_impl(ctx):",
+        "  return [",
+        "      apple_common.new_objc_provider(",
+        "          library=depset([ctx.file.library]),",
+        "      ), CcInfo()",
+        "  ]",
+        "custom_library = rule(",
+        "    _custom_library_impl,",
+        "    attrs={'library': attr.label(allow_single_file=True)},",
+        ")",
+        "def _custom_static_framework_import_impl(ctx):",
+        "  return [",
+        "      apple_common.new_objc_provider(",
+        "          imported_library=depset([ctx.file.library]),",
+        "      ), CcInfo()",
+        "  ]",
+        "custom_static_framework_import = rule(",
+        "    _custom_static_framework_import_impl,",
+        "    attrs={'library': attr.label(allow_single_file=True)},",
+        ")");
+
+    scratch.file(
+        "libs/BUILD",
+        "load('//test_starlark:apple_binary_starlark.bzl', 'apple_binary_starlark')",
+        "load(':defs.bzl', 'custom_library', 'custom_static_framework_import')",
+        "objc_library(",
+        "    name = 'objc_lib',",
+        "    srcs = ['a.m'],",
+        "    deps = [':framework_library'],",
+        ")",
+        "custom_library(",
+        "    name = 'framework_library',",
+        "    library = 'buzzbuzz.framework/buzzbuzz',",
+        ")",
+        "objc_library(",
+        "    name = 'objc_avoid_lib',",
+        "    srcs = ['b.m'],",
+        "    deps = [':framework'],",
+        ")",
+        "custom_static_framework_import(",
+        "    name = 'framework',",
+        "    library = 'buzzbuzz.framework/buzzbuzz',",
+        ")");
+
+    Artifact binArtifact =
+        getFirstArtifactEndingWith(lipoBinAction("//x:x").getInputs(), "x/x_bin");
+    Action action = getGeneratingAction(binArtifact);
+    assertThat(Artifact.toRootRelativePaths(action.getInputs()))
+        .doesNotContain("libs/buzzbuzz.framework/buzzbuzz");
+  }
+
   public void checkFilesToCompileOutputGroup(RuleType ruleType) throws Exception {
     ruleType.scratchTarget(scratch);
     ConfiguredTarget target = getConfiguredTarget("//x:x");