[Bazel 5] NullPointerException thrown during Starlark evaluation (//tests/ios/app:SwiftLib_objc)

[jerrymarino]

Loading: 0 packages loaded
Analyzing: target //tests/ios/app:SwiftLib_objc (50 packages loaded, 468 targets configured)
currently loading: rules/test_host_app ... (3 packages)
FATAL: bazel crashed due to an internal error. Printing stack trace:
java.lang.RuntimeException: Unrecoverable error while evaluating node 'ConfiguredTargetKey{label=//tests/ios/app:SwiftLib_objc, config=BuildConfigurationValue.Key[c1aab18881a67eadebc08dfe28cc5e00264832bc0f075ef703d8b6055e7b8ffc]}' (requested by nodes )
at com.google.devtools.build.skyframe.AbstractParallelEvaluator$Evaluate.run(AbstractParallelEvaluator.java:674)
at com.google.devtools.build.lib.concurrent.AbstractQueueVisitor$WrappedRunnable.run(AbstractQueueVisitor.java:382)
at java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(Unknown Source)
at java.base/java.util.concurrent.ForkJoinTask.doExec(Unknown Source)
at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(Unknown Source)
at java.base/java.util.concurrent.ForkJoinPool.scan(Unknown Source)
at java.base/java.util.concurrent.ForkJoinPool.runWorker(Unknown Source)
at java.base/java.util.concurrent.ForkJoinWorkerThread.run(Unknown Source)
Caused by: net.starlark.java.eval.Starlark$UncheckedEvalException: NullPointerException thrown during Starlark evaluation (//tests/ios/app:SwiftLib_objc)
at .create_compilation_attributes(:0)
at ._build_common_variables(/virtual_builtins_bzl/common/objc/compilation_support.bzl:80)
at ._objc_library_impl(/virtual_builtins_bzl/common/objc/objc_library.bzl:114)
Caused by: java.lang.NullPointerException
at java.base/java.lang.String.replace(Unknown Source)
at com.google.devtools.build.lib.rules.objc.ObjcStarlarkInternal.expandFlag(ObjcStarlarkInternal.java:145)
at com.google.devtools.build.lib.rules.objc.ObjcStarlarkInternal.expandToolchainAndRuleContextVariables(ObjcStarlarkInternal.java:119)
at com.google.devtools.build.lib.rules.objc.ObjcStarlarkInternal.createCompilationAttributes(ObjcStarlarkInternal.java:82)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
at net.starlark.java.eval.MethodDescriptor.call(MethodDescriptor.java:162)
at net.starlark.java.eval.BuiltinFunction.fastcall(BuiltinFunction.java:77)
at net.starlark.java.eval.Starlark.fastcall(Starlark.java:619)
at net.starlark.java.eval.Eval.evalCall(Eval.java:672)
at net.starlark.java.eval.Eval.eval(Eval.java:489)
at net.starlark.java.eval.Eval.execAssignment(Eval.java:109)
at net.starlark.java.eval.Eval.exec(Eval.java:268)
at net.starlark.java.eval.Eval.execStatements(Eval.java:82)
at net.starlark.java.eval.Eval.execFunctionBody(Eval.java:66)
at net.starlark.java.eval.StarlarkFunction.fastcall(StarlarkFunction.java:191)
at net.starlark.java.eval.Starlark.fastcall(Starlark.java:619)
at net.starlark.java.eval.Eval.evalCall(Eval.java:672)
at net.starlark.java.eval.Eval.eval(Eval.java:489)
at net.starlark.java.eval.Eval.execAssignment(Eval.java:109)
at net.starlark.java.eval.Eval.exec(Eval.java:268)
at net.starlark.java.eval.Eval.execStatements(Eval.java:82)
at net.starlark.java.eval.Eval.execFunctionBody(Eval.java:66)
at net.starlark.java.eval.StarlarkFunction.fastcall(StarlarkFunction.java:191)
at net.starlark.java.eval.Starlark.fastcall(Starlark.java:619)
at com.google.devtools.build.lib.analysis.starlark.StarlarkRuleConfiguredTargetUtil.buildRule(StarlarkRuleConfiguredTargetUtil.java:98)
at com.google.devtools.build.lib.analysis.ConfiguredTargetFactory.createRule(ConfiguredTargetFactory.java:353)
at com.google.devtools.build.lib.analysis.ConfiguredTargetFactory.createConfiguredTarget(ConfiguredTargetFactory.java:188)
at com.google.devtools.build.lib.skyframe.SkyframeBuildView.createConfiguredTarget(SkyframeBuildView.java:1108)
at com.google.devtools.build.lib.skyframe.ConfiguredTargetFunction.createConfiguredTarget(ConfiguredTargetFunction.java:990)
at com.google.devtools.build.lib.skyframe.ConfiguredTargetFunction.compute(ConfiguredTargetFunction.java:368)
at com.google.devtools.build.skyframe.AbstractParallelEvaluator$Evaluate.run(AbstractParallelEvaluator.java:590)
at com.google.devtools.build.lib.concurrent.AbstractQueueVisitor$WrappedRunnable.run(AbstractQueueVisitor.java:382)
at java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(Unknown Source)
at java.base/java.util.concurrent.ForkJoinTask.doExec(Unknown Source)
at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(Unknown Source)
at java.base/java.util.concurrent.ForkJoinPool.scan(Unknown Source)
at java.base/java.util.concurrent.ForkJoinPool.runWorker(Unknown Source)
at java.base/java.util.concurrent.ForkJoinWorkerThread.run(Unknown Source)

[thii]

I filed this a while ago, seems related to the rewrite of objc_library in Starlark bazelbuild/bazel#13862

[jerrymarino]

@thii awesome, do you happen to know if anyone is on point to fix this? I suspected lime uses this, and I know of a handful other rules in iOS the ecosystem did too.