Make artifact an interface (#2195)

* #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.

* Move slang-artifact into compiler-core.

* Split out Keep free functions.

* Artifact::Keep -> ArtifactKeep.

* Handle libraries as artifacts.

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

* Linking working in DXC.

* Improve handling around emit for 'export'.

* Add comment around Artifact name.

* Render test working with linking.

* Improvements around Artifact handling.

* Add ArtifactPayloadInfo.

* Small tidy up around artifact.

* Split out code to get info about Artifacts into artifact-info.cpp/.h

* IArtifact interface and IArtifactInstance interface.

* Fix small issues.

* Fix compilation warning issue.

* Fix missing SLANG_OVERRIDE.

* Small fixes to make compilation work on Visual Studio 2022.

* Small improvements to Artifact interface/naming.

* Added Desc with each element in IArchive to allow more flexibility in usage.

* Fix clang warning issue.

* Add ArtifactPayload::Diagnostics

* More discussion around IArtifact usage.

* Re-add slang-artifact.h which was removed during merge.

* Fix typo identified in review.

5 files changed, 11 insertions, 8 deletions

diff --git a/source/core/slang-archive-file-system.cpp b/source/core/slang-archive-file-system.cpp
index 8c4d0ef2d..0d998c849 100644
--- a/source/core/slang-archive-file-system.cpp
+++ b/source/core/slang-archive-file-system.cpp
@@ -96,6 +96,7 @@ void ImplicitDirectoryCollector::addRemainingPath(SlangPathType pathType, const
     }
 
     const Index countIndex = m_map.findOrAdd(pathRemainder, pathType);
+    SLANG_UNUSED(countIndex);
     // Make sure they are the same type
     SLANG_ASSERT(SlangPathType(m_map.getValueAt(countIndex)) == pathType);
 }
diff --git a/source/core/slang-com-object.h b/source/core/slang-com-object.h
index ad4578585..50dac5ba2 100644
--- a/source/core/slang-com-object.h
+++ b/source/core/slang-com-object.h
@@ -15,12 +15,13 @@ public:
     ComObject()
         : comRefCount(0)
     {}
-    ComObject(const ComObject&) : comRefCount(0) {}
-    ComObject& operator=(const ComObject&)
-    {
-        comRefCount = 0;
-        return *this;
-    };
+    ComObject(const ComObject& rhs) :
+        RefObject(rhs),
+        comRefCount(0) 
+    {}
+
+    ComObject& operator=(const ComObject&) { return *this; }
+
     virtual void comFree() {}
 
     uint32_t addRefImpl()
diff --git a/source/core/slang-deflate-compression-system.cpp b/source/core/slang-deflate-compression-system.cpp
index dab6654f7..6c75de9e4 100644
--- a/source/core/slang-deflate-compression-system.cpp
+++ b/source/core/slang-deflate-compression-system.cpp
@@ -50,7 +50,7 @@ SlangResult DeflateCompressionSystemImpl::compress(const CompressionStyle* style
     size_t compressedSizeInBytes;
 
     const int flags = 0;
-    void* compressed = tdefl_compress_mem_to_heap(src, srcSizeInBytes, &compressedSizeInBytes, 0);
+    void* compressed = tdefl_compress_mem_to_heap(src, srcSizeInBytes, &compressedSizeInBytes, flags);
 
     if (!compressed)
     {
diff --git a/source/core/slang-lz4-compression-system.cpp b/source/core/slang-lz4-compression-system.cpp
index fd360ce2e..4b8661534 100644
--- a/source/core/slang-lz4-compression-system.cpp
+++ b/source/core/slang-lz4-compression-system.cpp
@@ -56,6 +56,7 @@ SlangResult LZ4CompressionSystemImpl::compress(const CompressionStyle* style, co
 SlangResult LZ4CompressionSystemImpl::decompress(const void* compressed, size_t compressedSizeInBytes, size_t decompressedSizeInBytes, void* outDecompressed)
 {
     const int decompressedSize = LZ4_decompress_safe((const char*)compressed, (char*)outDecompressed, int(compressedSizeInBytes), int(decompressedSizeInBytes));
+    SLANG_UNUSED(decompressedSize);
     SLANG_ASSERT(size_t(decompressedSize) == decompressedSizeInBytes);
     return SLANG_OK;
 }
diff --git a/source/core/slang-smart-pointer.h b/source/core/slang-smart-pointer.h
index a6aa35906..c473cca3c 100644
--- a/source/core/slang-smart-pointer.h
+++ b/source/core/slang-smart-pointer.h
@@ -24,7 +24,7 @@ namespace Slang
             : referenceCount(0)
         {}
 
-        RefObject& operator=(const RefObject& rhs) = default;
+        RefObject& operator=(const RefObject&) { return *this; }
 
         virtual ~RefObject()
         {}