commit 42574a4d2ffd18947430186c5309df87e4c80c18
author Han-Wen Nienhuys <hanwen@google.com> Mon Aug 10 12:27:56 2015 +0000
committer Laszlo Csomor <laszlocsomor@google.com> Tue Aug 11 07:51:14 2015 +0000
tree a7988fb97906c96cdb1ec77747c38c87e4ae2c5f
parent cc0d9954c86a0ba07d4de2bde939d2debf7fea38

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

src/main/java/com/google/devtools/build/lib/actions/ParameterFile.java

diff --git a/src/main/java/com/google/devtools/build/lib/actions/ParameterFile.java b/src/main/java/com/google/devtools/build/lib/actions/ParameterFile.java
index d9af4f8..736d50f 100644
--- a/src/main/java/com/google/devtools/build/lib/actions/ParameterFile.java
+++ b/src/main/java/com/google/devtools/build/lib/actions/ParameterFile.java
@@ -66,7 +66,14 @@
    * Derives an path from a given path by appending <code>".params"</code>.
    */
   public static PathFragment derivePath(PathFragment original) {
-    return original.replaceName(original.getBaseName() + "-2.params");
+    return derivePath(original, "2");
+  }
+
+  /**
+   * Derives an path from a given path by appending <code>".params"</code>.
+   */
+  public static PathFragment derivePath(PathFragment original, String flavor) {
+    return original.replaceName(original.getBaseName() + "-" + flavor + ".params");
   }
 
 }