Fixes bugs so that we can build bazel with bazel on Windows

src/main/java/com/google/devtools/build/lib/exec/SymlinkTreeHelper.java:
    enable --windows_compatible flag on Windows to make build-runfiles.exe work.
scritps/bootstrap/compile.sh:
    --windows_compatible will also be passed to a dummy build-runfiles.exe defined in complie.sh.
    Which is actully a batch script, modify it to make it work.

-----
With the changes above, we are able to build bazel with bazel. But when you try to
run ./compile.sh compile /path/to/bazel again without clean up tmp directory, it will fail with
a permission deny error. The reason seems to be that you can't use build-runfile.exe to build the
same hard link twice, still trying to solve that.

--
Change-Id: I93340b1ba9fa415f6db963b106e264799e33ede3
Reviewed-on: https://bazel-review.googlesource.com/#/c/3334
MOS_MIGRATED_REVID=119751076

1 files changed, 4 insertions, 2 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/exec/SymlinkTreeHelper.java b/src/main/java/com/google/devtools/build/lib/exec/SymlinkTreeHelper.java
index 2980c718a5..0e47c2bd81 100644
--- a/src/main/java/com/google/devtools/build/lib/exec/SymlinkTreeHelper.java
+++ b/src/main/java/com/google/devtools/build/lib/exec/SymlinkTreeHelper.java
@@ -34,6 +34,7 @@ import com.google.devtools.build.lib.vfs.Path;
 import com.google.devtools.build.lib.vfs.PathFragment;
 import com.google.devtools.build.lib.vfs.UnixFileSystem;
 import com.google.devtools.build.lib.vfs.UnixFileSystem.SymlinkStrategy;
+import com.google.devtools.build.lib.vfs.WindowsFileSystem;
 
 import java.util.List;
 
@@ -149,8 +150,9 @@ public final class SymlinkTreeHelper {
     }
 
     FileSystem fs = execRoot.getFileSystem();
-    if (fs instanceof UnixFileSystem
-        && ((UnixFileSystem) fs).getSymlinkStrategy() == SymlinkStrategy.WINDOWS_COMPATIBLE) {
+    if ((fs instanceof WindowsFileSystem)
+        || (fs instanceof UnixFileSystem
+            && ((UnixFileSystem) fs).getSymlinkStrategy() == SymlinkStrategy.WINDOWS_COMPATIBLE)) {
       args.add("--windows_compatible");
     }