hacking weird cuda rebuilds

bazel.patch

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 3559fffde..37c483ce9 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
@@ -1111,10 +1111,30 @@ public class CppCompileAction extends AbstractAction
 
   @Override
   public String computeKey() {
+    // ".ckd" Compute Key Debug
+    PrintWriter computeKeyDebugWriter = null;
+    String computeKeyDebugFile = getInternalOutputFile() + ".ckd";
+    try {
+      computeKeyDebugWriter = new PrintWriter(computeKeyDebugFile, "UTF-8");
+    } catch (java.io.FileNotFoundException ex) {
+      System.err.println("Unable to create " + computeKeyDebugFile);
+    } catch (java.io.UnsupportedEncodingException ex) {
+      System.err.println("Unsupported encoding");
+    }
+
     Fingerprint f = new Fingerprint();
     f.addUUID(actionClassId);
+    computeKeyDebugWriter.println("UUID: " + actionClassId);
+
     f.addStringMap(getEnvironment());
+    for (Map.Entry<String, String> entry : getEnvironment().entrySet()) {
+      computeKeyDebugWriter.println("ENV: " + entry.getKey() + "=" + entry.getValue());
+    }
+
     f.addStringMap(executionInfo);
+    for (Map.Entry<String, String> entry : executionInfo.entrySet()) {
+      computeKeyDebugWriter.println("EXECINFO: " + entry.getKey() + "=" + entry.getValue());
+    }
 
     // For the argv part of the cache key, ignore all compiler flags that explicitly denote module
     // file (.pcm) inputs. Depending on input discovery, some of the unused ones are removed from
@@ -1124,6 +1144,9 @@ public class CppCompileAction extends AbstractAction
     // A better long-term solution would be to make the compiler to find them automatically and
     // never hand in the .pcm files explicitly on the command line in the first place.
     f.addStrings(compileCommandLine.getArgv(getInternalOutputFile(), null));
+    for (String input : compileCommandLine.getArgv(getInternalOutputFile(), null)) {
+      computeKeyDebugWriter.println("COMMAND: " + input);
+    }
 
     /*
      * getArgv() above captures all changes which affect the compilation
@@ -1133,19 +1156,31 @@ public class CppCompileAction extends AbstractAction
      * have changed, otherwise we might miss some errors.
      */
     f.addPaths(context.getDeclaredIncludeDirs());
+    for (PathFragment path : context.getDeclaredIncludeDirs()) {
+      computeKeyDebugWriter.println("DECLAREDINCLUDEDIRS: " + path.getPathString());
+    }
     f.addPaths(context.getDeclaredIncludeWarnDirs());
+    for (PathFragment path : context.getDeclaredIncludeWarnDirs()) {
+      computeKeyDebugWriter.println("DECLAREDINCLUDEWARNDIRS: " + path.getPathString());
+    }
     for (Artifact declaredIncludeSrc : context.getDeclaredIncludeSrcs()) {
       f.addPath(declaredIncludeSrc.getExecPath());
+      computeKeyDebugWriter.println("DECLAREDINCLUDESRCS: " + declaredIncludeSrc.getExecPath().getPathString());
     }
     f.addInt(0);  // mark the boundary between input types
     for (Artifact input : getMandatoryInputs()) {
       f.addPath(input.getExecPath());
+      computeKeyDebugWriter.println("MANDATORYINPUTS: " + input.getExecPath().getPathString());
     }
     f.addInt(0);
     for (Artifact input : prunableInputs) {
       f.addPath(input.getExecPath());
+      computeKeyDebugWriter.println("PRUNABLEINPUTS: " + input.getExecPath().getPathString());
     }
-    return f.hexDigestAndReset();
+    String rv = f.hexDigestAndReset();
+    computeKeyDebugWriter.println("KEY: " + rv);
+    computeKeyDebugWriter.close();
+    return rv;
   }
 
   @Override