Rollback of commit deeeb31f8ba0f196fbc9ca2a177d59d57ea50b32.

*** Reason for rollback ***

Breaks builds with current blaze

*** Original change description ***

Add a way to select non-default Xcode toolchain

* Adds a flag --xcode_toolchain which sets TOOLCHAINS env variable for xcrun.
* Updates swift_library to work with this flag when selecting Swift runtime location.
* By default the flag has a null value and is not set in env.

--
MOS_MIGRATED_REVID=135053864

4 files changed, 17 insertions, 70 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/rules/apple/AppleCommandLineOptions.java b/src/main/java/com/google/devtools/build/lib/rules/apple/AppleCommandLineOptions.java
index 3d71ca5ad8..5d2830a049 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/apple/AppleCommandLineOptions.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/apple/AppleCommandLineOptions.java
@@ -227,17 +227,6 @@ public class AppleCommandLineOptions extends FragmentOptions {
     }
   }
 
-  @Option(
-    name = "xcode_toolchain",
-    defaultValue = "null",
-    category = "flags",
-    help = "The identifier of an Xcode toolchain to use for builds. Currently only the toolchains "
-           + "that ship with Xcode are supported. For example, in addition to the default toolchain"
-           + " Xcode 8 has 'com.apple.dt.toolchain.Swift_2_3' which can be used for building legacy"
-           + " Swift code."
-  )
-  public String xcodeToolchain;
-
   @Option(name = "apple_bitcode",
       converter = AppleBitcodeMode.Converter.class,
       // TODO(blaze-team): Default to embedded_markers when fully implemented.
diff --git a/src/main/java/com/google/devtools/build/lib/rules/apple/AppleConfiguration.java b/src/main/java/com/google/devtools/build/lib/rules/apple/AppleConfiguration.java
index e0d242703f..59a6fc1403 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/apple/AppleConfiguration.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/apple/AppleConfiguration.java
@@ -84,7 +84,6 @@ public class AppleConfiguration extends BuildConfiguration.Fragment {
   private final ImmutableList<String> tvosCpus;
   private final AppleBitcodeMode bitcodeMode;
   private final Label xcodeConfigLabel;
-  @Nullable private final String xcodeToolchain;
   @Nullable private final Label defaultProvisioningProfileLabel;
   private final boolean disableNativeSwiftRules;
 
@@ -128,7 +127,6 @@ public class AppleConfiguration extends BuildConfiguration.Fragment {
     this.xcodeConfigLabel =
         Preconditions.checkNotNull(appleOptions.xcodeVersionConfig, "xcodeConfigLabel");
     this.defaultProvisioningProfileLabel = appleOptions.defaultProvisioningProfile;
-    this.xcodeToolchain = appleOptions.xcodeToolchain;
     this.disableNativeSwiftRules = appleOptions.disableNativeSwiftRules;
   }
 
@@ -521,17 +519,6 @@ public class AppleConfiguration extends BuildConfiguration.Fragment {
     return Joiner.on('-').join(components);
   }
 
-  /** Returns the identifier for an Xcode toolchain to use with tools. */
-  @SkylarkCallable(
-    name = "xcode_toolchain",
-    doc = "Identifier for the custom Xcode toolchain to use in build or None if not specified",
-    allowReturnNones = true,
-    structField = true
-  )
-  public String getXcodeToolchain() {
-    return xcodeToolchain;
-  }
-
   /**
    * Whether the native Swift support should be disabled. Used to deprecate said functionality.
    */
diff --git a/src/main/java/com/google/devtools/build/lib/rules/objc/CompilationSupport.java b/src/main/java/com/google/devtools/build/lib/rules/objc/CompilationSupport.java
index 8136e837ca..fa16aaf3f9 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/objc/CompilationSupport.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/objc/CompilationSupport.java
@@ -1445,22 +1445,9 @@ public final class CompilationSupport {
     }
 
     if (objcProvider.is(USES_SWIFT)) {
-      // Check if there's a swift library path already. If that's not the case - fall back to
-      // the default one. This is for backwards compatibility with Swift native rules.
-      // TODO(b/30281236): Remove when native Swift is deprecated.
-      boolean swiftLibDirSet = false;
-      for (String arg : objcProvider.get(ObjcProvider.LINKOPT)) {
-        if (arg.startsWith("-L") && arg.contains("usr/lib/swift")) {
-          swiftLibDirSet = true;
-          break;
-        }
-      }
-
-      if (!swiftLibDirSet) {
-        commandLine
-            .add("-L")
-            .add(AppleToolchain.swiftLibDir(appleConfiguration.getSingleArchPlatform()));
-      }
+      commandLine
+          .add("-L")
+          .add(AppleToolchain.swiftLibDir(appleConfiguration.getSingleArchPlatform()));
     }
 
     for (String linkopt : attributes.linkopts()) {
diff --git a/src/main/java/com/google/devtools/build/lib/rules/objc/ReleaseBundlingSupport.java b/src/main/java/com/google/devtools/build/lib/rules/objc/ReleaseBundlingSupport.java
index 4cf8e6264f..009b3fddfe 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/objc/ReleaseBundlingSupport.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/objc/ReleaseBundlingSupport.java
@@ -1058,21 +1058,13 @@ public final class ReleaseBundlingSupport {
       return;
     }
 
-    AppleConfiguration appleConfiguration = ruleContext.getFragment(AppleConfiguration.class);
-
-    CustomCommandLine.Builder commandLine = CustomCommandLine.builder();
-    if (appleConfiguration.getXcodeToolchain() != null) {
-      commandLine.add("--toolchain").add(appleConfiguration.getXcodeToolchain());
-    }
-
-    commandLine
-        .add("--output_zip_path")
-        .addPath(intermediateArtifacts.swiftFrameworksFileZip().getExecPath())
-        .add("--bundle_path")
-        .add("Frameworks")
-        .add("--platform")
-        .add(platform.getLowerCaseNameInPlist())
-        .addExecPath("--scan-executable", combinedArchBinary);
+    CustomCommandLine.Builder commandLine =
+        CustomCommandLine.builder()
+            .addPath(intermediateArtifacts.swiftFrameworksFileZip().getExecPath())
+            .add("Frameworks")
+            .add("--platform")
+            .add(platform.getLowerCaseNameInPlist())
+            .addExecPath("--scan-executable", combinedArchBinary);
 
     ruleContext.registerAction(
         ObjcRuleClasses.spawnAppleEnvActionBuilder(ruleContext, platform)
@@ -1090,21 +1082,13 @@ public final class ReleaseBundlingSupport {
       return;
     }
 
-    AppleConfiguration configuration = ruleContext.getFragment(AppleConfiguration.class);
-
-    CustomCommandLine.Builder commandLine = CustomCommandLine.builder();
-    if (configuration.getXcodeToolchain() != null) {
-      commandLine.add("--toolchain").add(configuration.getXcodeToolchain());
-    }
-
-    commandLine
-        .add("--output_zip_path")
-        .addPath(intermediateArtifacts.swiftSupportZip().getExecPath())
-        .add("--bundle_path")
-        .add("SwiftSupport/" + platform.getLowerCaseNameInPlist())
-        .add("--platform")
-        .add(platform.getLowerCaseNameInPlist())
-        .addExecPath("--scan-executable", combinedArchBinary);
+    CustomCommandLine.Builder commandLine =
+        CustomCommandLine.builder()
+            .addPath(intermediateArtifacts.swiftSupportZip().getExecPath())
+            .add("SwiftSupport/" + platform.getLowerCaseNameInPlist())
+            .add("--platform")
+            .add(platform.getLowerCaseNameInPlist())
+            .addExecPath("--scan-executable", combinedArchBinary);
 
     ruleContext.registerAction(
         ObjcRuleClasses.spawnAppleEnvActionBuilder(ruleContext, platform)