fix gcc 11 compilation errors

cpp/benchmarks/common/generate_benchmark_input.cpp

@@ -31,6 +31,7 @@
 
 #include <future>
 #include <memory>
+#include <optional>
 #include <random>
 #include <thread>
 #include <vector>

cpp/include/cudf/strings/repeat_strings.hpp

@@ -18,6 +18,8 @@
 #include <cudf/scalar/scalar.hpp>
 #include <cudf/strings/strings_column_view.hpp>
 
+#include <optional>
+
 namespace cudf {
 namespace strings {
 /**

cpp/include/cudf/strings/replace_re.hpp

@@ -20,6 +20,8 @@
 #include <cudf/strings/regex/flags.hpp>
 #include <cudf/strings/strings_column_view.hpp>
 
+#include <optional>
+
 namespace cudf {
 namespace strings {
 /**

cpp/src/io/orc/aggregate_orc_metadata.cpp

@@ -171,7 +171,7 @@ std::vector<metadata::stripe_source_mapping> aggregate_orc_metadata::select_stri
 
       // Coalesce stripe info at the source file later since that makes downstream processing much
       // easier in impl::read
-      for (const size_t& stripe_idx : user_specified_stripes[src_file_idx]) {
+      for (const size_t stripe_idx : user_specified_stripes[src_file_idx]) {
         CUDF_EXPECTS(stripe_idx < per_file_metadata[src_file_idx].ff.stripes.size(),
                      "Invalid stripe index");
         stripe_infos.push_back(

cpp/src/io/utilities/trie.cuh

@@ -23,6 +23,8 @@
 
 #include <cudf/utilities/span.hpp>
 
+#include <optional>
+
 namespace cudf {
 namespace detail {
 static constexpr char trie_terminating_character = '\n';

java/src/main/native/src/CompiledExpression.cpp

@@ -59,7 +59,7 @@ class jni_serialized_ast {
     check_for_eof(sizeof(T));
     // use memcpy since data may be misaligned
     T result;
-    memcpy(&result, data_ptr, sizeof(T));
+    memcpy(reinterpret_cast<jbyte *>(&result), data_ptr, sizeof(T));
     data_ptr += sizeof(T);
     return result;
   }