[sbt-bridge] Sort sources before compilation

Author: adpi2

sbt-bridge/src/xsbt/CompilerBridgeDriver.java

@@ -17,6 +17,9 @@
 import xsbti.*;
 import xsbti.compile.Output;
 
+import java.util.Comparator;
+import java.util.Arrays;
+
 public class CompilerBridgeDriver extends Driver {
   private final String[] scalacOptions;
   private final String[] args;
@@ -66,8 +69,20 @@ synchronized public void run(VirtualFile[] sources, AnalysisCallback callback, L
         log.debug(this::prettyPrintCompilationArguments);
         Compiler compiler = newCompiler(context);
 
+        VirtualFile[] sortedSources = new VirtualFile[sources.length];
+        System.arraycopy(sources, 0, sortedSources, 0, sources.length);
+        Arrays.sort(
+          sortedSources,
+          new Comparator<VirtualFile>() {
+            @Override
+            public int compare(VirtualFile x0, VirtualFile x1) {
+              return x0.id().compareTo(x1.id());
+            }
+          }
+        );
+
         ListBuffer<AbstractFile> sourcesBuffer = new ListBuffer<>();
-        for (VirtualFile file: sources)
+        for (VirtualFile file: sortedSources)
           sourcesBuffer.append(AbstractZincFile.of(file));
         doCompileFiles(compiler, sourcesBuffer.toList(), context);