Delete .pdb file before initializing PDB writer to make sure we get a sensible exception, instead of the random COM error that the PDB writer produces.

1 files changed, 3 insertions, 1 deletions

diff --git a/reflect/Impl/PdbWriter.cs b/reflect/Impl/PdbWriter.cs
index ab9484a1..c3ea0e48 100644
--- a/reflect/Impl/PdbWriter.cs
+++ b/reflect/Impl/PdbWriter.cs
@@ -306,9 +306,11 @@ namespace IKVM.Reflection.Impl
 		{
 			if (symUnmanagedWriter == null)
 			{
+				string fileName = System.IO.Path.ChangeExtension(moduleBuilder.FullyQualifiedName, ".pdb");
+				// pro-actively delete the .pdb to get a meaningful IOException, instead of COMInteropException if the file can't be overwritten (or is corrupt, or who knows what)
+				System.IO.File.Delete(fileName);
 				IMetaDataDispenser disp = new IMetaDataDispenser();
 				symUnmanagedWriter = new ISymUnmanagedWriter2();
-				string fileName = System.IO.Path.ChangeExtension(moduleBuilder.FullyQualifiedName, ".pdb");
 				object emitter;
 				Guid CLSID_CorMetaDataRuntime = new Guid("005023ca-72b1-11d3-9fc4-00c04f79a0a3");
 				Guid IID_IMetaDataEmit = typeof(IMetaDataEmit).GUID;