Disable include scanning for C++ linkstamp compile actions, which are supposed to be shared.

Note that CppCompileAction#discoversInputs() will still almost always return true because it's still set to true when .d file pruning is enabled.

RELNOTES: None.
PiperOrigin-RevId: 206716704

2 files changed, 2 insertions, 5 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/rules/cpp/CppCompileAction.java b/src/main/java/com/google/devtools/build/lib/rules/cpp/CppCompileAction.java
index 11c0565188..8c181ec7e4 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/cpp/CppCompileAction.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/cpp/CppCompileAction.java
@@ -131,9 +131,6 @@ public class CppCompileAction extends AbstractAction
    */
   private final UUID actionClassId;
 
-  /** Whether this action needs to discover inputs. */
-  private final boolean discoversInputs;
-
   private final ImmutableList<PathFragment> builtInIncludeDirectories;
 
   /**
@@ -275,7 +272,6 @@ public class CppCompileAction extends AbstractAction
     this.needsIncludeValidation = cppSemantics.needsIncludeValidation();
     this.includeProcessing = cppSemantics.getIncludeProcessing();
     this.actionClassId = actionClassId;
-    this.discoversInputs = shouldScanIncludes || cppSemantics.needsDotdInputPruning();
     this.builtInIncludeDirectories =
         ImmutableList.copyOf(cppProvider.getBuiltInIncludeDirectories());
     this.additionalInputs = null;
@@ -346,7 +342,7 @@ public class CppCompileAction extends AbstractAction
 
   @Override
   public boolean discoversInputs() {
-    return discoversInputs;
+    return shouldScanIncludes || needsDotdInputPruning;
   }
 
   @Override
diff --git a/src/main/java/com/google/devtools/build/lib/rules/cpp/CppLinkstampCompileHelper.java b/src/main/java/com/google/devtools/build/lib/rules/cpp/CppLinkstampCompileHelper.java
index e989097ddd..2fef020666 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/cpp/CppLinkstampCompileHelper.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/cpp/CppLinkstampCompileHelper.java
@@ -75,6 +75,7 @@ public class CppLinkstampCompileHelper {
             .setBuiltinIncludeFiles(buildInfoHeaderArtifacts)
             .addMandatoryInputs(nonCodeInputs)
             .setCppConfiguration(cppConfiguration)
+            .setShouldScanIncludes(false)
             .setActionName(CppActionNames.LINKSTAMP_COMPILE);
     semantics.finalizeCompileActionBuilder(ruleContext, builder);
     return builder.buildOrThrowIllegalStateException();