Remove expectation of clang in producing .gcno of assembly files for …

…instrumentation/coverage purposes.

This is easier by grouping together all assembly files in a file set, thus justifying a simultaneous cleanup of the redundant usage of the assembler-with-cpp flag

--
MOS_MIGRATED_REVID=102671848

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

@@ -205,17 +205,14 @@ private void registerCompileAction(
     ImmutableList.Builder<String> coverageFlags = new ImmutableList.Builder<>();
     ImmutableList.Builder<Artifact> gcnoFiles = new ImmutableList.Builder<>();
     ImmutableList.Builder<Artifact> additionalInputs = new ImmutableList.Builder<>();
-    if (isCodeCoverageEnabled) {
+    if (isCodeCoverageEnabled && ObjcRuleClasses.isInstrumentable(sourceFile)) {
       coverageFlags.addAll(CLANG_COVERAGE_FLAGS);
       gcnoFiles.add(intermediateArtifacts.gcnoFile(sourceFile));
     }
     CustomCommandLine.Builder commandLine = new CustomCommandLine.Builder();
     if (ObjcRuleClasses.CPP_SOURCES.matches(sourceFile.getExecPath())) {
       commandLine.add("-stdlib=libc++");
     }
-    if (ObjcRuleClasses.PREPROCESSED_ASSEMBLY_SOURCES.matches(sourceFile.getExecPath())) {
-      commandLine.add("-x").add("assembler-with-cpp");
-    }
 
     if (compilationArtifacts.hasSwiftSources()) {
       // Add the directory that contains merged TargetName-Swift.h header to search path, in case

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

@@ -461,8 +461,10 @@ GENERAL_RESOURCE_DIR, xcodeStructuredResourceDirs(attributes.structuredResources
         if (configuration.isCodeCoverageEnabled()
             && filter.isIncluded(context.getLabel().toString())) {
           for (Artifact source : allSources) {
-            objcProvider.add(INSTRUMENTED_SOURCE, source);
-            objcProvider.add(GCNO, intermediateArtifacts.gcnoFile(source));
+            if (ObjcRuleClasses.isInstrumentable(source)) {
+              objcProvider.add(INSTRUMENTED_SOURCE, source);
+              objcProvider.add(GCNO, intermediateArtifacts.gcnoFile(source));
+            }
           }
         }
 

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

@@ -142,6 +142,14 @@ public static ObjcConfiguration objcConfiguration(RuleContext ruleContext) {
     return ruleContext.getFragment(ObjcConfiguration.class);
   }
 
+  /**
+   * Returns true if the source file can be instrumented for coverage.
+   */
+  public static boolean isInstrumentable(Artifact sourceArtifact) {
+    return !ASSEMBLY_SOURCES.matches(sourceArtifact.getFilename());
+  }
+
+
   @VisibleForTesting
   static final Iterable<SdkFramework> AUTOMATIC_SDK_FRAMEWORKS = ImmutableList.of(
       new SdkFramework("Foundation"), new SdkFramework("UIKit"));
@@ -318,9 +326,9 @@ public Metadata getMetadata() {
    */
   static final FileType CPP_SOURCES = FileType.of(".cc", ".cpp", ".mm", ".cxx", ".C");
 
-  private static final FileType NON_CPP_SOURCES = FileType.of(".m", ".c", ".s", ".asm");
+  private static final FileType NON_CPP_SOURCES = FileType.of(".m", ".c");
 
-  static final FileType PREPROCESSED_ASSEMBLY_SOURCES = FileType.of(".S");
+  static final FileType ASSEMBLY_SOURCES = FileType.of(".s", ".S", ".asm");
 
   static final FileType SWIFT_SOURCES = FileType.of(".swift");
 
@@ -333,13 +341,13 @@ public Metadata getMetadata() {
    * Files allowed in the srcs attribute. This includes private headers.
    */
   static final FileTypeSet SRCS_TYPE = FileTypeSet.of(NON_CPP_SOURCES, CPP_SOURCES,
-      PREPROCESSED_ASSEMBLY_SOURCES, SWIFT_SOURCES, HEADERS);
+      ASSEMBLY_SOURCES, SWIFT_SOURCES, HEADERS);
 
   /**
    * Files that should actually be compiled.
    */
   static final FileTypeSet COMPILABLE_SRCS_TYPE = FileTypeSet.of(NON_CPP_SOURCES, CPP_SOURCES,
-      PREPROCESSED_ASSEMBLY_SOURCES, SWIFT_SOURCES);
+      ASSEMBLY_SOURCES, SWIFT_SOURCES);
 
   static final FileTypeSet NON_ARC_SRCS_TYPE = FileTypeSet.of(FileType.of(".m", ".mm"));