Experimental support LLVM ThinLTO.

ThinLTO is a Link Time Opimization strategy, where the inlining step operates on LLVM intermediate code, and is sharded across multiple compiler invocations, so they can be parallelized. For more information, see http://llvm.org/devmtg/2015-04/slides/ThinLTO_EuroLLVM2015.pdf

Using this features requires an experimental LLVM toolchain, with the following stanza in CROSSTOOL

  feature {
    name: "thin_lto"
    flag_set {
      action: "c-compile"
      action: "c++-compile"
      flag_group {
       flag: "-Xclang-only=-Wno-inconsistent-missing-override"
       flag: "-flto"
       flag: "-O2"
      }
    }
  }

--
MOS_MIGRATED_REVID=100269776

1 files changed, 2 insertions, 8 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/analysis/actions/ParamFileHelper.java b/src/main/java/com/google/devtools/build/lib/analysis/actions/ParamFileHelper.java
index e061961671..08f5394592 100644
--- a/src/main/java/com/google/devtools/build/lib/analysis/actions/ParamFileHelper.java
+++ b/src/main/java/com/google/devtools/build/lib/analysis/actions/ParamFileHelper.java
@@ -72,15 +72,9 @@ public final class ParamFileHelper {
       return null;
     }
 
-    return getParamsFile(analysisEnvironment, configuration, Iterables.getFirst(outputs, null));
-  }
+    PathFragment paramFilePath =
+        ParameterFile.derivePath(Iterables.getFirst(outputs, null).getRootRelativePath());
 
-  /**
-   * Returns a params file for the specified output file.
-   */
-  public static Artifact getParamsFile(AnalysisEnvironment analysisEnvironment,
-      BuildConfiguration configuration, Artifact output) {
-    PathFragment paramFilePath = ParameterFile.derivePath(output.getRootRelativePath());
     return analysisEnvironment.getDerivedArtifact(paramFilePath, configuration.getBinDirectory());
   }