Add struct version to DownstreamCompiler::CompileOptions interface (#2692)

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

* Add versioning to CompileOptions for DownstreamCompiler so we can add new options without breaking binary interface.

* Use builtin offset of directly.

1 files changed, 8 insertions, 2 deletions

diff --git a/source/compiler-core/slang-downstream-compiler.cpp b/source/compiler-core/slang-downstream-compiler.cpp
index 104f1e631..b312f9cb8 100644
--- a/source/compiler-core/slang-downstream-compiler.cpp
+++ b/source/compiler-core/slang-downstream-compiler.cpp
@@ -68,11 +68,17 @@ void* DownstreamCompilerBase::getObject(const Guid& guid)
 
 SlangResult CommandLineDownstreamCompiler::compile(const CompileOptions& inOptions, IArtifact** outArtifact)
 {
+    if (!isVersionCompatible(inOptions))
+    {
+        // Not possible to compile with this version of the interface.
+        return SLANG_E_NOT_IMPLEMENTED;
+    }
+
+    CompileOptions options = getCompatibleVersion(&inOptions);
+
     // Copy the command line options
     CommandLine cmdLine(m_cmdLine);
 
-    CompileOptions options(inOptions);
-
     // Work out the ArtifactDesc 
     const auto targetDesc = ArtifactDescUtil::makeDescForCompileTarget(options.targetType);