Swift: remove -frontend option as we don't need it yet

swift/extractor/Extractor.cpp

@@ -82,12 +82,11 @@ void Extractor::extractFile(swift::SourceFile& file) {
     return;
   }
   std::stringstream ss;
-  ss << "-frontend ";
   for (auto opt : config.frontendOptions) {
     ss << std::quoted(opt) << " ";
   }
   ss << "\n";
-  trap << "// frontend-options: " << ss.str();
+  trap << "// extractor-args: " << ss.str();
 
   trap << "#0=*\n";
   trap << "files(#0, " << std::quoted(srcFilePath.str().str()) << ")\n";

swift/extractor/main.cpp

@@ -34,12 +34,6 @@ int main(int argc, char** argv) {
     // TODO: print usage
     return 1;
   }
-  // The frontend can be called in different modes, we are only interested
-  // in -frontend mode
-  // TODO: filter out at the tracer level
-  if ("-frontend"s != argv[1]) {
-    return 0;
-  }
   // Required by Swift/LLVM
   PROGRAM_START(argc, argv);
   INITIALIZE_LLVM();
@@ -49,9 +43,6 @@ int main(int argc, char** argv) {
   configuration.sourceArchiveDir = getenv_or("CODEQL_EXTRACTOR_SWIFT_SOURCE_ARCHIVE_DIR", ".");
   std::vector<const char*> args;
   for (int i = 1; i < argc; i++) {
-    if ("-frontend"s == argv[i]) {
-      continue;
-    }
     args.push_back(argv[i]);
   }
   std::copy(std::begin(args), std::end(args), std::back_inserter(configuration.frontendOptions));

swift/tools/qltest.sh

@@ -4,4 +4,4 @@ mkdir -p "$CODEQL_EXTRACTOR_SWIFT_TRAP_DIR"
 
 QLTEST_LOG="$CODEQL_EXTRACTOR_SWIFT_LOG_DIR"/qltest.log
 
-exec "$CODEQL_EXTRACTOR_SWIFT_ROOT/tools/$CODEQL_PLATFORM/extractor" -frontend -sdk "$CODEQL_EXTRACTOR_SWIFT_ROOT/qltest/$CODEQL_PLATFORM/sdk" -c *.swift >> $QLTEST_LOG 2>&1
+exec "$CODEQL_EXTRACTOR_SWIFT_ROOT/tools/$CODEQL_PLATFORM/extractor" -sdk "$CODEQL_EXTRACTOR_SWIFT_ROOT/qltest/$CODEQL_PLATFORM/sdk" -c *.swift >> $QLTEST_LOG 2>&1