Improve error when java_toolchain.header_compiler is unset

--
PiperOrigin-RevId: 144339611
MOS_MIGRATED_REVID=144339611

3 files changed, 26 insertions, 15 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/rules/java/JavaCompilationHelper.java b/src/main/java/com/google/devtools/build/lib/rules/java/JavaCompilationHelper.java
index 342b9bac68..76b277c42a 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/java/JavaCompilationHelper.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/java/JavaCompilationHelper.java
@@ -301,9 +301,12 @@ public final class JavaCompilationHelper {
       return false;
     }
     if (javaToolchain.getHeaderCompiler() == null) {
-      getRuleContext().ruleError(
-          "header compilation was requested but it is not support by the current Java toolchain;"
-              + " see the java_toolchain.header_compiler attribute");
+      getRuleContext()
+          .ruleError(
+              String.format(
+                  "header compilation was requested but it is not supported by the current Java"
+                      + " toolchain '%s'; see the java_toolchain.header_compiler attribute",
+                  javaToolchain.getToolchainLabel()));
       return false;
     }
     return true;
diff --git a/src/main/java/com/google/devtools/build/lib/rules/java/JavaToolchain.java b/src/main/java/com/google/devtools/build/lib/rules/java/JavaToolchain.java
index ebc87e4bd7..4fc57a648c 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/java/JavaToolchain.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/java/JavaToolchain.java
@@ -72,18 +72,20 @@ public final class JavaToolchain implements RuleConfiguredTargetFactory {
             jvmOpts,
             javacSupportsWorkers ? SupportsWorkers.YES : SupportsWorkers.NO);
     final JavaConfiguration configuration = ruleContext.getFragment(JavaConfiguration.class);
-    JavaToolchainProvider provider = JavaToolchainProvider.create(
-        toolchainData,
-        bootclasspath,
-        extclasspath,
-        configuration.getDefaultJavacFlags(),
-        javac,
-        javabuilder,
-        headerCompiler,
-        singleJar,
-        genClass,
-        ijar,
-        compatibleJavacOptions);
+    JavaToolchainProvider provider =
+        JavaToolchainProvider.create(
+            ruleContext.getLabel(),
+            toolchainData,
+            bootclasspath,
+            extclasspath,
+            configuration.getDefaultJavacFlags(),
+            javac,
+            javabuilder,
+            headerCompiler,
+            singleJar,
+            genClass,
+            ijar,
+            compatibleJavacOptions);
     RuleConfiguredTargetBuilder builder = new RuleConfiguredTargetBuilder(ruleContext)
         .addSkylarkTransitiveInfo(JavaToolchainSkylarkApiProvider.NAME,
             new JavaToolchainSkylarkApiProvider())
diff --git a/src/main/java/com/google/devtools/build/lib/rules/java/JavaToolchainProvider.java b/src/main/java/com/google/devtools/build/lib/rules/java/JavaToolchainProvider.java
index 600a8edd61..eae78ed877 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/java/JavaToolchainProvider.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/java/JavaToolchainProvider.java
@@ -21,6 +21,7 @@ import com.google.devtools.build.lib.analysis.FilesToRunProvider;
 import com.google.devtools.build.lib.analysis.RuleConfiguredTarget.Mode;
 import com.google.devtools.build.lib.analysis.RuleContext;
 import com.google.devtools.build.lib.analysis.TransitiveInfoProvider;
+import com.google.devtools.build.lib.cmdline.Label;
 import com.google.devtools.build.lib.collect.nestedset.NestedSet;
 import com.google.devtools.build.lib.concurrent.ThreadSafety.Immutable;
 import java.util.List;
@@ -39,6 +40,7 @@ public abstract class JavaToolchainProvider implements TransitiveInfoProvider {
   }
 
   public static JavaToolchainProvider create(
+      Label label,
       JavaToolchainData data,
       NestedSet<Artifact> bootclasspath,
       NestedSet<Artifact> extclasspath,
@@ -51,6 +53,7 @@ public abstract class JavaToolchainProvider implements TransitiveInfoProvider {
       FilesToRunProvider ijar,
       ImmutableListMultimap<String, String> compatibleJavacOptions) {
     return new AutoValue_JavaToolchainProvider(
+        label,
         data.getSourceVersion(),
         data.getTargetVersion(),
         bootclasspath,
@@ -73,6 +76,9 @@ public abstract class JavaToolchainProvider implements TransitiveInfoProvider {
         data.getJavacSupportsWorkers());
   }
 
+  /** Returns the label for this {@code java_toolchain}. */
+  public abstract Label getToolchainLabel();
+
   /** @return the input Java language level */
   public abstract String getSourceVersion();