Expose current java_toolchain target to Skylark.

This value can be passed in Skylark to java_common.compile#java_toolchain in
order to avoid incompatibility issues when the value of --java_toolchain uses a
different Java version.

PiperOrigin-RevId: 161528114

1 files changed, 12 insertions, 0 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/rules/java/JavaSkylarkCommon.java b/src/main/java/com/google/devtools/build/lib/rules/java/JavaSkylarkCommon.java
index 4d3359161c..75ad63bde0 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/java/JavaSkylarkCommon.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/java/JavaSkylarkCommon.java
@@ -444,6 +444,18 @@ public class JavaSkylarkCommon {
         .build();
   }
 
+  @SkylarkCallable(
+      name = "java_toolchain_attr",
+      doc = "Creates a dependency on the current Java toolchain. Should only be used in the "
+          + "attribute dictionary of a rule definition.",
+      structField = true
+  )
+  public SkylarkAttr.Descriptor getJavaToolchainAttribute() {
+    return new SkylarkAttr.Descriptor(
+        "java_toolchain_attr",
+        new Attribute.Builder<>("", BuildType.LABEL).value(JavaSemantics.JAVA_TOOLCHAIN));
+  }
+
   private static StrictDepsMode getStrictDepsMode(String strictDepsMode) {
     switch (strictDepsMode) {
       case "OFF":