Don't mask error in cquery transitions output formatter

src/main/java/com/google/devtools/build/lib/query2/cquery/CqueryTransitionResolver.java

@@ -131,8 +131,8 @@ public CqueryTransitionResolver(
    * @see ResolvedTransition for more details.
    * @param configuredTarget the configured target whose dependencies are being looked up.
    */
-  public ImmutableSet<ResolvedTransition> dependencies(CqueryNode configuredTarget)
-      throws EvaluateException, InterruptedException {
+  ImmutableSet<ResolvedTransition> dependencies(CqueryNode configuredTarget)
+      throws EvaluateException, InterruptedException, IncompatibleTargetException {
     if (!(configuredTarget instanceof RuleConfiguredTarget)) {
       return ImmutableSet.of();
     }
@@ -161,7 +161,7 @@ public ImmutableSet<ResolvedTransition> dependencies(CqueryNode configuredTarget
           eventHandler)) {
         throw new EvaluateException("DependencyResolver.evaluate did not complete");
       }
-    } catch (ReportedException | UnreportedException | IncompatibleTargetException e) {
+    } catch (ReportedException | UnreportedException e) {
       throw new EvaluateException(e.getMessage());
     }
 

src/main/java/com/google/devtools/build/lib/query2/cquery/TransitionsOutputFormatterCallback.java

@@ -21,7 +21,9 @@
 import com.google.devtools.build.lib.analysis.config.BuildOptions;
 import com.google.devtools.build.lib.analysis.config.OptionsDiff;
 import com.google.devtools.build.lib.analysis.config.StarlarkTransitionCache;
+import com.google.devtools.build.lib.analysis.config.transitions.ConfigurationTransition;
 import com.google.devtools.build.lib.analysis.config.transitions.TransitionFactory;
+import com.google.devtools.build.lib.analysis.constraints.IncompatibleTargetChecker;
 import com.google.devtools.build.lib.analysis.producers.BuildConfigurationKeyCache;
 import com.google.devtools.build.lib.cmdline.Label;
 import com.google.devtools.build.lib.events.Event;
@@ -113,8 +115,18 @@ public void processOutput(Iterable<CqueryNode> partialResult) throws Interrupted
                     buildConfigurationKeyCache)
                 .dependencies(keyedConfiguredTarget);
       } catch (EvaluateException e) {
-        // This is an abuse of InterruptedException.
-        throw new InterruptedException(e.getMessage());
+        eventHandler.handle(
+            Event.error(
+                String.format(
+                    "Failed to evaluate %s: %s", keyedConfiguredTarget.getOriginalLabel(), e)));
+        return;
+      } catch (IncompatibleTargetChecker.IncompatibleTargetException e) {
+        eventHandler.handle(
+            Event.warn(
+                String.format(
+                    "Skipping dependencies of incompatible target %s",
+                    keyedConfiguredTarget.getOriginalLabel())));
+        return;
       }
       for (ResolvedTransition dep : dependencies) {
         addResult(

src/test/java/com/google/devtools/build/lib/query2/cquery/ProtoOutputFormatterCallbackTest.java

@@ -529,6 +529,29 @@ public void outputOnAliasDep() throws Exception {
         .doesNotContain("//test:my_child");
   }
 
+
+  @Test
+  public void incompatibleTarget() throws Exception {
+    writeFile(
+        "test/BUILD",
+        """
+            constraint_setting(name = "incompatible_setting")
+            constraint_value(
+                name = "incompatible",
+                constraint_setting = ":incompatible_setting",
+            )
+            genrule(
+                name = "my_target",
+                cmd = "touch $@",
+                outs = ["out"],
+                target_compatible_with = [":incompatible"],
+            )""");
+
+    options.transitions = Transitions.LITE;
+    AnalysisProtosV2.CqueryResult cqueryResult =
+        getProtoOutput("deps(//test:my_target)", AnalysisProtosV2.CqueryResult.parser());
+  }
+
   private CqueryNode getKeyedTargetByLabel(Set<CqueryNode> keyedTargets, String label) {
     return Iterables.getOnlyElement(
         keyedTargets.stream()

src/test/shell/integration/configured_query_test.sh

@@ -217,6 +217,38 @@ function test_transitions_full() {
   assert_contains "host_dep#//$pkg:host#(exec + (TestTrimmingTransition + ConfigFeatureFlagTaggedTrimmingTransition))" output
 }
 
+function test_transitions_incompatible_target() {
+  local -r pkg=$FUNCNAME
+
+  mkdir -p $pkg
+  cat > $pkg/BUILD <<EOF
+constraint_setting(name = "incompatible_setting")
+constraint_value(
+    name = "incompatible",
+    constraint_setting = ":incompatible_setting",
+)
+genrule(
+    name = "gr",
+    srcs = [":input"],
+    cmd = "touch $@",
+    outs = ["out"],
+    target_compatible_with = [":incompatible"],
+)
+genrule(
+    name = "input",
+    cmd = "echo hi > $@",
+    outs = ["in"],
+)
+EOF
+
+    bazel cquery "deps(//$pkg:gr)" --transitions=lite \
+      > output 2>"$TEST_log" || fail "Excepted success"
+
+    assert_contains "//$pkg:gr" output
+    assert_not_contains "//$pkg:input" output
+    expect_log "WARNING: Skipping dependencies of incompatible target //$pkg:gr"
+}
+
 function write_test_targets() {
   mkdir -p $pkg
   cat > $pkg/rule.bzl <<'EOF'