Set Xcode version as a feature when building Objective-C

Add a new standard feature set to the Xcode version being used for
compilation. (The feature is named `xcode_VERSION`, where `VERSION` is
at least a two-component version number; `xcode_9.0` and `xcode_9.2` are
both possible values.) This provides CROSSTOOL authors a mechanism to
deploy compiler flags supported only in certain Xcode versions.

PiperOrigin-RevId: 203000420

1 files changed, 24 insertions, 0 deletions

diff --git a/src/test/java/com/google/devtools/build/lib/rules/objc/ObjcLibraryTest.java b/src/test/java/com/google/devtools/build/lib/rules/objc/ObjcLibraryTest.java
index f6a40e57ff..ae879d288c 100644
--- a/src/test/java/com/google/devtools/build/lib/rules/objc/ObjcLibraryTest.java
+++ b/src/test/java/com/google/devtools/build/lib/rules/objc/ObjcLibraryTest.java
@@ -1269,6 +1269,30 @@ public class ObjcLibraryTest extends ObjcRuleTestCase {
   }
 
   @Test
+  public void testXcodeVersionFeature() throws Exception {
+    useConfiguration("--xcode_version=5.8");
+
+    createLibraryTargetWriter("//objc:lib")
+        .setAndCreateFiles("srcs", "a.m")
+        .write();
+    CommandAction action = compileAction("//objc:lib", "a.o");
+
+    assertThat(action.getArguments()).contains("-DXCODE_FEATURE_FOR_TESTING=xcode_5.8");
+  }
+
+  @Test
+  public void testXcodeVersionFeatureUnused() throws Exception {
+    useConfiguration("--xcode_version=7.3");
+
+    createLibraryTargetWriter("//objc:lib")
+        .setAndCreateFiles("srcs", "a.m")
+        .write();
+    CommandAction action = compileAction("//objc:lib", "a.o");
+
+    assertThat(action.getArguments()).doesNotContain("-DXCODE_FEATURE_FOR_TESTING=xcode_5.8");
+  }
+
+  @Test
   public void testIosSdkVersionCannotBeDefinedButEmpty() throws Exception {
     try {
       useConfiguration("--ios_sdk_version=");