DownstreamCompileOptions using POD types (#2381)

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

* Make DownstreamCompileOptions use POD types.

* CharSliceAllocator -> SliceAllocator
Added SliceConverter
CharSliceCaster -> SliceCaster

* First attempt at zero terminating around blobs.

* Fix clang warning.

* Add SlangTerminatedChars
Make Blob implementations support it.
Make most blobs 'terminated'.

* Fix bug setting up sourceFiles for CommandLineDownstreamCompiler.

* Traffic in TerminatedCharSlice for sourceFiles.
Use ArtifactDesc to generate temporary file names for source.

* Fix typo in testing for shared library/C++.

1 files changed, 9 insertions, 0 deletions

diff --git a/slang.h b/slang.h
index 53ab0c70a..a224bf6f6 100644
--- a/slang.h
+++ b/slang.h
@@ -980,6 +980,15 @@ extern "C"
     };
     #define SLANG_UUID_ISlangBlob ISlangBlob::getTypeGuid()
 
+    /* Can be requested from ISlangCastable cast to indicate the contained chars are null terminated.  
+    */
+    struct SlangTerminatedChars
+    {
+        SLANG_CLASS_GUID(0xbe0db1a8, 0x3594, 0x4603, { 0xa7, 0x8b, 0xc4, 0x86, 0x84, 0x30, 0xdf, 0xbb });
+        operator const char*() const { return chars; }
+        char chars[1];
+    };
+
     /** A (real or virtual) file system.
 
     Slang can make use of this interface whenever it would otherwise try to load files