A more convoluted #pragma once file identity test, using relative paths. (#1021)

* A more convoluted #pragma once file identity test, using relative paths.

* Fix bug with passing - to slang as a command line option causes a crash.
Ability to set file-system to use on command line.
#pragma once tests try with 'normal' and 'read-file' only versions

* OSFileSystem -> OSFileSystemExt
LoadFileOSFileSystem -> OSFileSystem

Implemented OSFileSystem like OSFileSystemExt as as singleton.
Fixes to comments.

1 files changed, 4 insertions, 4 deletions

diff --git a/source/slang/slang.cpp b/source/slang/slang.cpp
index f0570132f..eef0dff6f 100644
--- a/source/slang/slang.cpp
+++ b/source/slang/slang.cpp
@@ -2365,17 +2365,17 @@ void Linkage::setFileSystem(ISlangFileSystem* inFileSystem)
     // Set the fileSystem
     fileSystem = inFileSystem;
 
-    // Set up fileSystemExt appropriately
+    // If nullptr passed in set up default 
     if (inFileSystem == nullptr)
     {
-        fileSystemExt = new Slang::CacheFileSystem(Slang::OSFileSystem::getSingleton());
+        fileSystemExt = new Slang::CacheFileSystem(Slang::OSFileSystemExt::getSingleton());
     }
     else
     {
-        // See if we have the interface 
+        // See if we have the full ISlangFileSystemExt interface, if we do just use it
         inFileSystem->queryInterface(IID_ISlangFileSystemExt, (void**)fileSystemExt.writeRef());
 
-        // If not wrap with WrapFileSytem that keeps the old behavior
+        // If not wrap with CacheFileSystem that emulates ISlangFileSystemExt from the ISlangFileSystem interface
         if (!fileSystemExt)
         {
             // Construct a wrapper to emulate the extended interface behavior