$ make hotspot-ide-project
Building target 'hotspot-ide-project' in configuration 'windows-x64-debug'
Updating support/modules_cmds/jdk.hotspot.agent/jhsdb.exe due to makefile changes
Compiling up to 8 files for BUILD_PROJECT_CREATOR
<cut>\open\make\ide\visualstudio\hotspot\src\classes\build\tools\projectcreator\FileTreeCreator.java:54: warning: [this-escape] possible 'this' escape before subclass is fully initialized
      attributes.push(new DirAttributes());
                      ^
error: warnings found and -Werror specified
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 error
1 warning
make[3]: *** [ide/visualstudio/hotspot/CreateVSProject.gmk:89: <cut>/build/windows-x64-debug/hotspot/support/ide_classes/_the.BUILD_PROJECT_CREATOR_batch] Error 1
make[2]: *** [make/Main.gmk:263: hotspot-ide-project] Error 2