Changes imported from Abseil "staging" branch:

  - 53419b5e123c4c9c47ecfe52ba747a271b03ae9c Add the sampling weight to MallocHook_SampledAlloc, so th... by Abseil Team <absl-team@google.com>
  - 8689c9a0dc685f50ba843a8d0d7d4274a1ec656a Factor out inline variable detection to separate macro. by Matt Calabrese <calabrese@google.com>
  - 0eac39ee9d81c03b8335c1cd3871d0dc4ec7bca7 Log the actual and expected durations for failed timing t... by Abseil Team <absl-team@google.com>

GitOrigin-RevId: 53419b5e123c4c9c47ecfe52ba747a271b03ae9c
Change-Id: I4ae8f5c0e924cdeee253fdf37d483d47893fc64c

3 files changed, 31 insertions, 7 deletions

diff --git a/absl/base/internal/inline_variable.h b/absl/base/internal/inline_variable.h
index f7bb8c56..a65fe893 100644
--- a/absl/base/internal/inline_variable.h
+++ b/absl/base/internal/inline_variable.h
@@ -53,7 +53,24 @@
 //   it will likely be a reference type).
 ////////////////////////////////////////////////////////////////////////////////
 
-#ifdef __cpp_inline_variables
+// ABSL_INTERNAL_HAS_WARNING()
+//
+// If the compiler supports the `__has_warning` extension for detecting
+// warnings, then this macro is defined to be `__has_warning`.
+//
+// If the compiler does not support `__has_warning`, invocations expand to 0.
+//
+// For clang's documentation of `__has_warning`, see
+// https://clang.llvm.org/docs/LanguageExtensions.html#has-warning
+#if defined(__has_warning)
+#define ABSL_INTERNAL_HAS_WARNING __has_warning
+#else  // Otherwise, be optimistic and assume the warning is not enabled.
+#define ABSL_INTERNAL_HAS_WARNING(warning) 0
+#endif  // defined(__has_warning)
+
+// If the compiler supports inline variables and does not warn when used...
+#if defined(__cpp_inline_variables) && \
+    !ABSL_INTERNAL_HAS_WARNING("-Wc++98-c++11-c++14-compat")
 
 // Clang's -Wmissing-variable-declarations option erroneously warned that
 // inline constexpr objects need to be pre-declared. This has now been fixed,
@@ -66,19 +83,21 @@
 //   identity_t is used here so that the const and name are in the
 //   appropriate place for pointer types, reference types, function pointer
 //   types, etc..
-#if defined(__clang__)
+#if defined(__clang__) && \
+    ABSL_INTERNAL_HAS_WARNING("-Wmissing-variable-declarations")
 #define ABSL_INTERNAL_EXTERN_DECL(type, name) \
   extern const ::absl::internal::identity_t<type> name;
 #else  // Otherwise, just define the macro to do nothing.
 #define ABSL_INTERNAL_EXTERN_DECL(type, name)
-#endif  // defined(__clang__)
+#endif  // defined(__clang__) &&
+        // ABSL_INTERNAL_HAS_WARNING("-Wmissing-variable-declarations")
 
 // See above comment at top of file for details.
 #define ABSL_INTERNAL_INLINE_CONSTEXPR(type, name, init) \
   ABSL_INTERNAL_EXTERN_DECL(type, name)                  \
   inline constexpr ::absl::internal::identity_t<type> name = init
 
-#else
+#else  // Otherwise, we need to emulate inline variables...
 
 // See above comment at top of file for details.
 //
@@ -102,6 +121,7 @@
   static_assert(sizeof(void (*)(decltype(name))) != 0,                        \
                 "Silence unused variable warnings.")
 
-#endif  // __cpp_inline_variables
+#endif  // defined(__cpp_inline_variables) &&
+        // !ABSL_INTERNAL_HAS_WARNING("-Wc++98-c++11-c++14-compat")
 
 #endif  // ABSL_BASE_INTERNAL_INLINE_VARIABLE_EMULATION_H_
diff --git a/absl/base/internal/malloc_hook.h b/absl/base/internal/malloc_hook.h
index 7c1eaddb..6b006eda 100644
--- a/absl/base/internal/malloc_hook.h
+++ b/absl/base/internal/malloc_hook.h
@@ -91,8 +91,11 @@ class MallocHook {
   // SampledAlloc has the following fields:
   //  * AllocHandle handle: to be set to an effectively unique value (in this
   //    process) by allocator.
-  //  * size_t allocated_size: space actually used by allocator to host
-  //    the object.
+  //  * size_t allocated_size: space actually used by allocator to host the
+  //    object. Not necessarily equal to the requested size due to alignment
+  //    and other reasons.
+  //  * double weight: the expected number of allocations matching this profile
+  //    that this sample represents.
   //  * int stack_depth and const void* stack: invocation stack for
   //    the allocation.
   // The allocator invoking the hook should record the handle value and later
diff --git a/absl/base/internal/malloc_hook_c.h b/absl/base/internal/malloc_hook_c.h
index ed41143a..7255ddc2 100644
--- a/absl/base/internal/malloc_hook_c.h
+++ b/absl/base/internal/malloc_hook_c.h
@@ -37,6 +37,7 @@ typedef struct {
   /* See malloc_hook.h  for documentation for this struct. */
   MallocHook_AllocHandle handle;
   size_t allocated_size;
+  double weight;
   int stack_depth;
   const void* stack;
 } MallocHook_SampledAlloc;