Export of internal Abseil changes

--
8e3ed8c8f770f9371f037e4956334b6e38525e91 by Abseil Team <absl-team@google.com>:

Remove legacy, non-standard sanitizer macros.

PiperOrigin-RevId: 367079577

--
c06aa9b9c20ba2e87dfc6933bbf8a30e0502d70a by Martijn Vels <mvels@google.com>:

Remove kFakeCordzInfo and last caller to set_profiled()

These have all been superseded by clear_cordz_info() and set_cordz_info()

PiperOrigin-RevId: 367020835

--
e0bd3e4e0b46db495663261a1664815eb94999f8 by Abseil Team <absl-team@google.com>:

AbseilConfigureCopts.cmake: fix AppleClang detection

restore use of MATCHES in comparison with "Clang"; this was lost in:

commit 22771d47
  ...
  24e1f5f72756046f5265abf618e951c341f09b8d by Derek Mauro <dmauro@google.com>:

  Fixes failing CMake string comparisons
  https://cmake.org/cmake/help/latest/policy/CMP0054.html

fixes:
CMake Warning at absl/copts/AbseilConfigureCopts.cmake:61 (message):
  Unknown compiler:
  /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++.
  Building with no default flags

Fixes #930

PiperOrigin-RevId: 366879337
GitOrigin-RevId: 8e3ed8c8f770f9371f037e4956334b6e38525e91
Change-Id: I7b027b7e82491676b59dc9d23cfe063ea6004d3b

absl/base/config.h

@@ -690,10 +690,6 @@ static_assert(ABSL_INTERNAL_INLINE_NAMESPACE_STR[0] != 'h' ||
 // a compiler instrumentation module and a run-time library.
 #ifdef ABSL_HAVE_MEMORY_SANITIZER
 #error "ABSL_HAVE_MEMORY_SANITIZER cannot be directly set."
-#elif defined(MEMORY_SANITIZER)
-// The MEMORY_SANITIZER macro is deprecated but we will continue to honor it
-// for now.
-#define ABSL_HAVE_MEMORY_SANITIZER 1
 #elif defined(__SANITIZE_MEMORY__)
 #define ABSL_HAVE_MEMORY_SANITIZER 1
 #elif !defined(__native_client__) && ABSL_HAVE_FEATURE(memory_sanitizer)
@@ -705,10 +701,6 @@ static_assert(ABSL_INTERNAL_INLINE_NAMESPACE_STR[0] != 'h' ||
 // ThreadSanitizer (TSan) is a fast data race detector.
 #ifdef ABSL_HAVE_THREAD_SANITIZER
 #error "ABSL_HAVE_THREAD_SANITIZER cannot be directly set."
-#elif defined(THREAD_SANITIZER)
-// The THREAD_SANITIZER macro is deprecated but we will continue to honor it
-// for now.
-#define ABSL_HAVE_THREAD_SANITIZER 1
 #elif defined(__SANITIZE_THREAD__)
 #define ABSL_HAVE_THREAD_SANITIZER 1
 #elif ABSL_HAVE_FEATURE(thread_sanitizer)
@@ -720,10 +712,6 @@ static_assert(ABSL_INTERNAL_INLINE_NAMESPACE_STR[0] != 'h' ||
 // AddressSanitizer (ASan) is a fast memory error detector.
 #ifdef ABSL_HAVE_ADDRESS_SANITIZER
 #error "ABSL_HAVE_ADDRESS_SANITIZER cannot be directly set."
-#elif defined(ADDRESS_SANITIZER)
-// The ADDRESS_SANITIZER macro is deprecated but we will continue to honor it
-// for now.
-#define ABSL_HAVE_ADDRESS_SANITIZER 1
 #elif defined(__SANITIZE_ADDRESS__)
 #define ABSL_HAVE_ADDRESS_SANITIZER 1
 #elif ABSL_HAVE_FEATURE(address_sanitizer)

absl/copts/AbseilConfigureCopts.cmake

@@ -35,8 +35,7 @@ endif()
 if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
   set(ABSL_DEFAULT_COPTS "${ABSL_GCC_FLAGS}")
   set(ABSL_TEST_COPTS "${ABSL_GCC_FLAGS};${ABSL_GCC_TEST_FLAGS}")
-elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
-  # MATCHES so we get both Clang and AppleClang
+elseif(CMAKE_CXX_COMPILER_ID MATCHES "Clang")  # MATCHES so we get both Clang and AppleClang
   if(MSVC)
     # clang-cl is half MSVC, half LLVM
     set(ABSL_DEFAULT_COPTS "${ABSL_CLANG_CL_FLAGS}")

absl/strings/cord.cc

@@ -495,7 +495,6 @@ void Cord::InlineRep::AssignSlow(const Cord::InlineRep& src) {
 
   data_ = src.data_;
   if (is_tree()) {
-    data_.set_profiled(false);
     CordRep::Ref(tree());
     clear_cordz_info();
   }

absl/strings/internal/cord_internal.h

@@ -335,11 +335,6 @@ class InlineData {
   // byte of cordz_info overlaps with the last byte holding the tag.
   static constexpr cordz_info_t kNullCordzInfo = BigEndianByte(1);
 
-  // kFakeCordzInfo holds a 'fake', non-null cordz-info value we use to
-  // emulate the previous 'kProfiled' tag logic in 'set_profiled' until
-  // cord code is changed to store cordz_info values in InlineData.
-  static constexpr cordz_info_t kFakeCordzInfo = BigEndianByte(9);
-
   constexpr InlineData() : as_chars_{0} {}
   explicit constexpr InlineData(CordRep* rep) : as_tree_(rep) {}
   explicit constexpr InlineData(absl::string_view chars)
@@ -454,13 +449,6 @@ class InlineData {
     tag() = static_cast<char>(size << 1);
   }
 
-  // Sets or unsets the 'is_profiled' state of this instance.
-  // Requires the current instance to hold a tree value.
-  void set_profiled(bool profiled) {
-    assert(is_tree());
-    as_tree_.cordz_info = profiled ? kFakeCordzInfo : kNullCordzInfo;
-  }
-
  private:
   // See cordz_info_t for forced alignment and size of `cordz_info` details.
   struct AsTree {