Option for removing PDB path information in PE

src/Compilers/Core/Portable/Compilation/Compilation.cs

@@ -1776,6 +1776,18 @@ private static EmitResult ToEmitResultAndFree(DiagnosticBag diagnostics, bool su
             bool emitPortablePdb = moduleBeingBuilt.EmitOptions.DebugInformationFormat == DebugInformationFormat.PortablePdb;
             string pdbPath = (pdbStreamProvider != null) ? (moduleBeingBuilt.EmitOptions.PdbFilePath ?? FileNameUtilities.ChangeExtension(SourceModule.Name, "pdb")) : null;
 
+            // The PDB path is emitted in it's entirety into the PE.  This makes it impossible to have deterministic
+            // builds that occur in different source directories.  To enable this we shave all path information from
+            // the PDB when specified by the user.  
+            //
+            // This is a temporary work around to allow us to make progress with determinism.  The following issue 
+            // tracks getting an official solution here.
+            //
+            // https://github.com/dotnet/roslyn/issues/9813
+            string pePdbPath = Feature("pdb-path-determinism") != null && !string.IsNullOrEmpty(pdbPath)
+                ? Path.GetFileName(pdbPath)
+                : pdbPath;
+
             try
             {
                 metadataDiagnostics = DiagnosticBag.GetInstance();
@@ -1872,7 +1884,7 @@ private static EmitResult ToEmitResultAndFree(DiagnosticBag diagnostics, bool su
                         getPeStream,
                         getPortablePdbStream,
                         nativePdbWriter,
-                        pdbPath,
+                        pePdbPath,
                         metadataOnly,
                         deterministic,
                         cancellationToken))