`export` support in HLSL (#2188)

* #include an absolute path didn't work - because paths were taken to always be relative.

* Compile to a dxil library.

* Added CompileProduct.

* Support handling of ModuleLibrary.

* CacheBehavior -> Cache

* Use CompileProduct for -r references.

* CompileProduct -> Artifact.

* Determining an artifact type on binding.

* Determine binary linkability.

* Added Artifact::exists.

* Added ArtifactKeep.

* Small fixes.

* Small improvements to Artifact.

* Add zip extension.

* Fix some comments.

* Fix multiple adding of PublicDecoration.
Make public output export for DXIL/lib.
Add checking for simpleDecorations such that only added once.

* Use 'whole program' to identify library build.

* Add -target dxil so test infrastructure knows it needs DXC.

1 files changed, 10 insertions, 1 deletions

diff --git a/source/slang/slang-artifact.cpp b/source/slang/slang-artifact.cpp
index 612c2365d..770f2202a 100644
--- a/source/slang/slang-artifact.cpp
+++ b/source/slang/slang-artifact.cpp
@@ -148,6 +148,13 @@ static const KindExtension g_cpuKindExts[] =
 {
     switch (payload)
     {
+        case Payload::DXBC:
+        {
+            // It seems as if DXBC is potentially linkable from
+            // https://docs.microsoft.com/en-us/windows/win32/direct3dhlsl/dx-graphics-hlsl-appendix-keywords#export
+            return true;
+        }
+
         case Payload::DXIL:
         case Payload::PTX:
         case Payload::SPIRV:
@@ -397,16 +404,18 @@ SlangResult Artifact::requireFilePath(Keep keep, String& outFilePath)
             auto parentDir = Path::getParentDirectory(path);
             if (parentDir.getLength())
             {
-                // Prefix the lib
+                // Combine the name with path if their is a parent 
                 path = Path::combine(parentDir, buf);
             }
             else
             {
+                // Just use the name as is
                 path = buf;
             }
         }
     }
 
+    // If there is an extension append it
     if (ext.getLength())
     {
         path.appendChar('.');