Rollback the copt-changing functionality of the extension_safe attribute

This change impacted build times of builds with libraries that needed to be built both extension-safe and non-extension-safe.
This also caused duplicate symbol issues in such builds.

The extension_safe attribute will now be a no-op, with subsequent removal to follow.

RELNOTES: The extension_safe attribute of apple_binary no longer validates transitive dependencies are compiled against extension_safe APIs.
PiperOrigin-RevId: 159142000

src/main/java/com/google/devtools/build/lib/rules/apple/AppleConfiguration.java

@@ -679,22 +679,14 @@ public enum ConfigurationDistinguisher {
     FRAMEWORK("framework"),
     /** Split transition distinguisher for {@code apple_watch1_extension} rule. */
     WATCH_OS1_EXTENSION("watch_os1_extension"),
-    /** Distinguisher for non-extension {@code apple_binary} rule with "ios" platform_type. */
+    /** Distinguisher for {@code apple_binary} rule with "ios" platform_type. */
     APPLEBIN_IOS("applebin_ios"),
-    /** Distinguisher for non-extension {@code apple_binary} rule with "watchos" platform_type. */
+    /** Distinguisher for {@code apple_binary} rule with "watchos" platform_type. */
     APPLEBIN_WATCHOS("applebin_watchos"),
-    /** Distinguisher for non-extension {@code apple_binary} rule with "tvos" platform_type. */
+    /** Distinguisher for {@code apple_binary} rule with "tvos" platform_type. */
     APPLEBIN_TVOS("applebin_tvos"),
-    /** Distinguisher for non-extension {@code apple_binary} rule with "macos" platform_type. */
+    /** Distinguisher for {@code apple_binary} rule with "macos" platform_type. */
     APPLEBIN_MACOS("applebin_macos"),
-    /** Distinguisher for extension {@code apple_binary} rule with "ios" platform_type. */
-    APPLEBIN_IOS_EXT("applebin_ios_ext"),
-    /** Distinguisher for extension {@code apple_binary} rule with "watchos" platform_type. */
-    APPLEBIN_WATCHOS_EXT("applebin_watchos_ext"),
-    /** Distinguisher for extension {@code apple_binary} rule with "tvos" platform_type. */
-    APPLEBIN_TVOS_EXT("applebin_tvos_ext"),
-    /** Distinguisher for extension {@code apple_binary} rule with "macos" platform_type. */
-    APPLEBIN_MACOS_EXT("applebin_macos_ext"),
 
     /**
      * Distinguisher for the apple crosstool configuration.  We use "apl" for output directory

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

@@ -120,8 +120,8 @@ the main() function.
                 .value(AppleBinary.BinaryType.EXECUTABLE.toString())
                 .allowedValues(new AllowedValueSet(AppleBinary.BinaryType.getValues())))
         /* <!-- #BLAZE_RULE(apple_binary).ATTRIBUTE(extension_safe) -->
-        Indicates whether this binary is for an extension. This will set certain compiler
-        options and restrictions on dependencies of this target.
+        This attribute is deprecated and will be removed soon. It currently has no effect.
+        "Extension-safe" link options may be added using the <code>linkopts</code> attribute.
         <!-- #END_BLAZE_RULE.ATTRIBUTE --> */
         .add(attr(EXTENSION_SAFE_ATTR_NAME, BOOLEAN).value(false)
             .nonconfigurable("Determines the configuration transition on deps"))

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

@@ -14,7 +14,6 @@
 
 package com.google.devtools.build.lib.rules.objc;
 
-import static com.google.devtools.build.lib.syntax.Type.BOOLEAN;
 import static com.google.devtools.build.lib.syntax.Type.STRING;
 
 import com.google.common.annotations.VisibleForTesting;
@@ -52,7 +51,6 @@ public class MultiArchSplitTransitionProvider implements SplitTransitionProvider
       "Invalid version string \"%s\". Version must be of the form 'x.y' without alphabetic "
           + "characters, such as '4.3'.";
 
-  private static final String EXTENSION_COPT = "-fapplication-extension";
   private static final ImmutableSet<PlatformType> SUPPORTED_PLATFORM_TYPES =
       ImmutableSet.of(
           PlatformType.IOS, PlatformType.WATCHOS, PlatformType.TVOS, PlatformType.MACOS);
@@ -122,8 +120,6 @@ public SplitTransition<?> apply(Rule fromRule) {
         attrMapper.get(MultiArchPlatformRule.PLATFORM_TYPE_ATTR_NAME, STRING);
     String minimumOsVersionString = 
         attrMapper.get(MultiArchPlatformRule.MINIMUM_OS_VERSION, STRING);
-    boolean isExtension = attrMapper.has(AppleBinaryRule.EXTENSION_SAFE_ATTR_NAME, BOOLEAN)
-        && attrMapper.get(AppleBinaryRule.EXTENSION_SAFE_ATTR_NAME, BOOLEAN);
     PlatformType platformType;
     Optional<DottedVersion> minimumOsVersion;
     try {
@@ -142,7 +138,7 @@ public SplitTransition<?> apply(Rule fromRule) {
       minimumOsVersion = Optional.absent();
     }
 
-    return new AppleBinaryTransition(platformType, minimumOsVersion, isExtension);
+    return new AppleBinaryTransition(platformType, minimumOsVersion);
   }
 
   /**
@@ -155,14 +151,11 @@ protected static class AppleBinaryTransition implements SplitTransition<BuildOpt
     private final PlatformType platformType;
     // TODO(b/37096178): This should be a mandatory attribute.
     private final Optional<DottedVersion> minimumOsVersion;
-    private final boolean isExtension;
 
     public AppleBinaryTransition(PlatformType platformType,
-        Optional<DottedVersion> minimumOsVersion,
-        boolean isExtension) {
+        Optional<DottedVersion> minimumOsVersion) {
       this.platformType = platformType;
       this.minimumOsVersion = minimumOsVersion;
-      this.isExtension = isExtension;
     }
 
     @Override
@@ -176,9 +169,7 @@ public final List<BuildOptions> split(BuildOptions buildOptions) {
           if (cpus.isEmpty()) {
             cpus = ImmutableList.of(buildOptions.get(AppleCommandLineOptions.class).iosCpu);
           }
-          configurationDistinguisher = isExtension
-              ? ConfigurationDistinguisher.APPLEBIN_IOS_EXT
-              : ConfigurationDistinguisher.APPLEBIN_IOS;
+          configurationDistinguisher = ConfigurationDistinguisher.APPLEBIN_IOS;
           actualMinimumOsVersion = minimumOsVersion.isPresent() ? minimumOsVersion.get()
               : buildOptions.get(AppleCommandLineOptions.class).iosMinimumOs;
           break;
@@ -187,9 +178,7 @@ public final List<BuildOptions> split(BuildOptions buildOptions) {
           if (cpus.isEmpty()) {
             cpus = ImmutableList.of(AppleCommandLineOptions.DEFAULT_WATCHOS_CPU);
           }
-          configurationDistinguisher = isExtension
-              ? ConfigurationDistinguisher.APPLEBIN_WATCHOS_EXT
-              : ConfigurationDistinguisher.APPLEBIN_WATCHOS;
+          configurationDistinguisher = ConfigurationDistinguisher.APPLEBIN_WATCHOS;
           actualMinimumOsVersion = minimumOsVersion.isPresent() ? minimumOsVersion.get()
               : buildOptions.get(AppleCommandLineOptions.class).watchosMinimumOs;
           break;
@@ -198,9 +187,7 @@ public final List<BuildOptions> split(BuildOptions buildOptions) {
           if (cpus.isEmpty()) {
             cpus = ImmutableList.of(AppleCommandLineOptions.DEFAULT_TVOS_CPU);
           }
-          configurationDistinguisher = isExtension
-              ? ConfigurationDistinguisher.APPLEBIN_TVOS_EXT
-              : ConfigurationDistinguisher.APPLEBIN_TVOS;
+          configurationDistinguisher = ConfigurationDistinguisher.APPLEBIN_TVOS;
           actualMinimumOsVersion = minimumOsVersion.isPresent() ? minimumOsVersion.get()
               : buildOptions.get(AppleCommandLineOptions.class).tvosMinimumOs;
           break;
@@ -209,25 +196,17 @@ public final List<BuildOptions> split(BuildOptions buildOptions) {
           if (cpus.isEmpty()) {
             cpus = ImmutableList.of(AppleCommandLineOptions.DEFAULT_MACOS_CPU);
           }
-          configurationDistinguisher = isExtension
-              ? ConfigurationDistinguisher.APPLEBIN_MACOS_EXT
-              : ConfigurationDistinguisher.APPLEBIN_MACOS;
+          configurationDistinguisher = ConfigurationDistinguisher.APPLEBIN_MACOS;
           actualMinimumOsVersion = minimumOsVersion.isPresent() ? minimumOsVersion.get()
               : buildOptions.get(AppleCommandLineOptions.class).macosMinimumOs;
           break;
         default:
           throw new IllegalArgumentException("Unsupported platform type " + platformType);
       }
 
-      List<String> copts = buildOptions.get(ObjcCommandLineOptions.class).copts;
-      if (isExtension && !copts.contains(EXTENSION_COPT)) {
-        copts = ImmutableList.<String>builder()
-            .addAll(copts).add(EXTENSION_COPT).build();
-      }
       ImmutableList.Builder<BuildOptions> splitBuildOptions = ImmutableList.builder();
       for (String cpu : cpus) {
         BuildOptions splitOptions = buildOptions.clone();
-        splitOptions.get(ObjcCommandLineOptions.class).copts = copts;
 
         AppleCommandLineOptions appleCommandLineOptions =
             splitOptions.get(AppleCommandLineOptions.class);