Abseil LTS 2020092320200923

What's New:
* `absl::StatusOr<T>` has been released. See our [blog
  post](https://abseil.io/blog/2020-091021-status) for more
  information.
* Abseil Flags reflection interfaces have been released.
* Abseil Flags memory usage has been significantly optimized.
* Abseil now supports a "hardened" build mode. This build mode enables
  runtime checks that guard against programming errors that may lead
  to security vulnerabilities.

Notable Fixes:
* Sanitizer dynamic annotations like `AnnotateRWLockCreate` that are
  also defined by the compiler sanitizer implementation are no longer
  also defined by Abseil.
* Sanitizer macros are now prefixed with `ABSL_` to avoid naming collisions.
* Sanitizer usage is now automatically detected and no longer requires
  macros like `ADDRESS_SANITIZER` to be defined on the command line.

Breaking Changes:
* Abseil no longer contains a `dynamic_annotations` library. Users
  using a supported build system (Bazel or CMake) are unaffected by
  this, but users manually specifying link libraries may get an error
  about a missing linker input.

Baseline: 7680a5f8efe32de4753baadbd63e74e59d95bac1
Cherry picks: None

1 files changed, 4 insertions, 4 deletions

diff --git a/absl/strings/str_cat.cc b/absl/strings/str_cat.cc
index d9afe2f3..dd5d25b0 100644
--- a/absl/strings/str_cat.cc
+++ b/absl/strings/str_cat.cc
@@ -141,12 +141,12 @@ namespace strings_internal {
 std::string CatPieces(std::initializer_list<absl::string_view> pieces) {
   std::string result;
   size_t total_size = 0;
-  for (const absl::string_view piece : pieces) total_size += piece.size();
+  for (const absl::string_view& piece : pieces) total_size += piece.size();
   strings_internal::STLStringResizeUninitialized(&result, total_size);
 
   char* const begin = &result[0];
   char* out = begin;
-  for (const absl::string_view piece : pieces) {
+  for (const absl::string_view& piece : pieces) {
     const size_t this_size = piece.size();
     if (this_size != 0) {
       memcpy(out, piece.data(), this_size);
@@ -170,7 +170,7 @@ void AppendPieces(std::string* dest,
                   std::initializer_list<absl::string_view> pieces) {
   size_t old_size = dest->size();
   size_t total_size = old_size;
-  for (const absl::string_view piece : pieces) {
+  for (const absl::string_view& piece : pieces) {
     ASSERT_NO_OVERLAP(*dest, piece);
     total_size += piece.size();
   }
@@ -178,7 +178,7 @@ void AppendPieces(std::string* dest,
 
   char* const begin = &(*dest)[0];
   char* out = begin + old_size;
-  for (const absl::string_view piece : pieces) {
+  for (const absl::string_view& piece : pieces) {
     const size_t this_size = piece.size();
     if (this_size != 0) {
       memcpy(out, piece.data(), this_size);