Non functional changes.

Just shuffling code in the build() method to simplify future review.
1. Reuse result of getRootRelativePath()
2. Delay linkerInputs generation
3. allowLtoIndexing ? thinltoParamFile : null -> thinltoParamFile
  it must be null if indexing is not allowed

RELNOTES: None
PiperOrigin-RevId: 182626938

1 files changed, 16 insertions, 15 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/rules/cpp/CppLinkActionBuilder.java b/src/main/java/com/google/devtools/build/lib/rules/cpp/CppLinkActionBuilder.java
index 31e287a4cd..63e9e0336d 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/cpp/CppLinkActionBuilder.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/cpp/CppLinkActionBuilder.java
@@ -806,17 +806,6 @@ public class CppLinkActionBuilder {
     }
     final Iterable<Artifact> objectArtifacts = LinkerInputs.toLibraryArtifacts(objectFileInputs);
 
-    final Iterable<LinkerInput> linkerInputs =
-        IterablesChain.<LinkerInput>builder()
-            .add(objectFileInputs)
-            .add(
-                ImmutableIterable.from(
-                    Link.mergeInputsCmdLine(
-                        uniqueLibraries,
-                        needWholeArchive,
-                        CppHelper.getArchiveType(cppConfiguration, toolchain))))
-            .build();
-
     final LibraryToLink outputLibrary =
         linkType.isExecutable()
             ? null
@@ -839,6 +828,7 @@ public class CppLinkActionBuilder {
                 /* sharedNonLtoBackends= */ null);
 
     @Nullable Artifact thinltoParamFile = null;
+    PathFragment outputRootPath = output.getRootRelativePath();
     if (allowLtoIndexing && allLtoArtifacts != null) {
       // Create artifact for the file that the LTO indexing step will emit
       // object file names into for any that were included in the link as
@@ -847,8 +837,7 @@ public class CppLinkActionBuilder {
       // Note that the paths emitted into this file will have their prefixes
       // replaced with the final output directory, so they will be the paths
       // of the native object files not the input bitcode files.
-      PathFragment linkerParamFileRootPath =
-          ParameterFile.derivePath(output.getRootRelativePath(), "lto-final");
+      PathFragment linkerParamFileRootPath = ParameterFile.derivePath(outputRootPath, "lto-final");
       thinltoParamFile =
           linkArtifactFactory.create(ruleContext, configuration, linkerParamFileRootPath);
     }
@@ -872,11 +861,22 @@ public class CppLinkActionBuilder {
               symbolCounts);
     }
 
+    final Iterable<LinkerInput> linkerInputs =
+        IterablesChain.<LinkerInput>builder()
+            .add(objectFileInputs)
+            .add(
+                ImmutableIterable.from(
+                    Link.mergeInputsCmdLine(
+                        uniqueLibraries,
+                        needWholeArchive,
+                        CppHelper.getArchiveType(cppConfiguration, toolchain))))
+            .build();
+
     ImmutableList<LinkerInput> runtimeLinkerInputs =
         ImmutableList.copyOf(LinkerInputs.simpleLinkerInputs(runtimeInputs, runtimeType));
 
     PathFragment paramRootPath =
-        ParameterFile.derivePath(output.getRootRelativePath(), (isLtoIndexing) ? "lto-index" : "2");
+        ParameterFile.derivePath(outputRootPath, (isLtoIndexing) ? "lto-index" : "2");
 
     @Nullable
     final Artifact paramFile =
@@ -887,6 +887,7 @@ public class CppLinkActionBuilder {
     // Add build variables necessary to template link args into the crosstool.
     Variables.Builder buildVariablesBuilder = new Variables.Builder(toolchain.getBuildVariables());
     Preconditions.checkState(!isLtoIndexing || allowLtoIndexing);
+    Preconditions.checkState(allowLtoIndexing || thinltoParamFile == null);
     CppLinkVariablesExtension variablesExtension =
         isLtoIndexing
             ? new CppLinkVariablesExtension(
@@ -909,7 +910,7 @@ public class CppLinkActionBuilder {
                 runtimeLinkerInputs,
                 output,
                 paramFile,
-                allowLtoIndexing ? thinltoParamFile : null,
+                thinltoParamFile,
                 /* ltoOutputRootPrefix= */ PathFragment.EMPTY_FRAGMENT,
                 allowLtoIndexing,
                 toolchain.getInterfaceSoBuilder(),