[wpiutil] Separate third party libraries (#4190)

wpiutil/src/main/native/include/wpi/ReverseIteration.h

@@ -1,15 +0,0 @@
-#ifndef WPI_REVERSEITERATION_H
-#define WPI_REVERSEITERATION_H
-
-#include "wpi/PointerLikeTypeTraits.h"
-
-namespace wpi {
-
-template<class T = void *>
-constexpr bool shouldReverseIterate() {
-  return false;
-}
-
-}
-
-#endif

wpiutil/src/main/native/include/wpi/fs.h

@@ -40,7 +40,7 @@ using fstream = std::fstream;
 #ifndef GHC_USE_STD_FS
 // #define GHC_WIN_DISABLE_WSTRING_STORAGE_TYPE
 #define GHC_FILESYSTEM_FWD
-#include "ghc/filesystem.hpp"
+#include "wpi/ghc/filesystem.hpp"
 namespace fs {
 using namespace ghc::filesystem;
 using ifstream = ghc::filesystem::ifstream;

wpiutil/src/main/native/include/wpi/spinlock.h

@@ -9,7 +9,7 @@
 #include <mutex>
 #include <thread>
 
-#include "Compiler.h"
+#include "wpi/Compiler.h"
 
 namespace wpi {
 

wpiutil/src/main/native/thirdparty/llvm/include/wpi/ReverseIteration.h

@@ -0,0 +1,18 @@
+#ifndef WPIUTIL_WPI_REVERSEITERATION_H
+#define WPIUTIL_WPI_REVERSEITERATION_H
+
+#include "wpi/PointerLikeTypeTraits.h"
+
+namespace wpi {
+
+template<class T = void *>
+bool shouldReverseIterate() {
+#if LLVM_ENABLE_REVERSE_ITERATION
+  return detail::IsPointerLike<T>::value;
+#else
+  return false;
+#endif
+}
+
+}
+#endif