Export of internal Abseil changes

--
f4c7e510922668c68be4aa79a00867c3d3ca9f95 by Derek Mauro <dmauro@google.com>:

Many improvements to LeakChecker builds

The presence of the LeakChecker is now detected when possible. GCC
users using LeakChecker in standalone mode still need to use
-DLEAK_CHECKER. This is now documented in the header.

The hacky targets used for testing leak checking have been removed in
favor of testing in AddressSanitizer mode on Kokoro.

Fixes #885
Fixes #1153

PiperOrigin-RevId: 441203393
Change-Id: Ibe64ef6b104bcaf31839ff7184e558cc86abdd1c

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5c70a23aa83b8152ab95d2cf21662fc63c80ef7d by Abseil Team <absl-team@google.com>:

Add a benchmark for stacktrace

PiperOrigin-RevId: 441196473
Change-Id: I4c9aa2e797aa2cae09abfaaee3abe5c09eb62fc4

--
50b406052273b9d5bad04a7860a96e4d5d956c02 by Abseil Team <absl-team@google.com>:

Internal change.

PiperOrigin-RevId: 441114481
Change-Id: I667af7a50d5631ca91289dd24c91ba90233e0184

--
568b4eaac120b420bce5290179d407d2b57d5bae by Dino Radakovic <dinor@google.com>:

Internal change

PiperOrigin-RevId: 440894155
Change-Id: Ia587ffc65a8321126585fb363b7c0ca8cc2a0da2

--
d53948eace4f3a10ac5a6c1496dc51b81adc412c by Abseil Team <absl-team@google.com>:

Explicitly give internal linkage to symbols which are not used outside of their
translation units.

PiperOrigin-RevId: 440424519
Change-Id: I531c5e229d443375483b7550a34f48042589a99b
GitOrigin-RevId: f4c7e510922668c68be4aa79a00867c3d3ca9f95

2 files changed, 7 insertions, 5 deletions

diff --git a/absl/flags/flag_test.cc b/absl/flags/flag_test.cc
index 05ec79e8..845b4eba 100644
--- a/absl/flags/flag_test.cc
+++ b/absl/flags/flag_test.cc
@@ -854,7 +854,9 @@ ABSL_RETIRED_FLAG(bool, old_bool_flag, true, "old descr");
 ABSL_RETIRED_FLAG(int, old_int_flag, (int)std::sqrt(10), "old descr");
 ABSL_RETIRED_FLAG(std::string, old_str_flag, "", absl::StrCat("old ", "descr"));
 
-bool initializaion_order_fiasco_test = [] {
+namespace {
+
+bool initialization_order_fiasco_test ABSL_ATTRIBUTE_UNUSED = [] {
   // Iterate over all the flags during static initialization.
   // This should not trigger ASan's initialization-order-fiasco.
   auto* handle1 = absl::FindCommandLineFlag("flag_on_separate_file");
@@ -865,8 +867,6 @@ bool initializaion_order_fiasco_test = [] {
   return true;
 }();
 
-namespace {
-
 TEST_F(FlagTest, TestRetiredFlagRegistration) {
   auto* handle = absl::FindCommandLineFlag("old_bool_flag");
   EXPECT_TRUE(handle->IsOfType<bool>());
diff --git a/absl/flags/internal/usage_test.cc b/absl/flags/internal/usage_test.cc
index 044d71c8..6a65a1a3 100644
--- a/absl/flags/internal/usage_test.cc
+++ b/absl/flags/internal/usage_test.cc
@@ -47,8 +47,10 @@ struct UDT {
   UDT(const UDT&) = default;
   UDT& operator=(const UDT&) = default;
 };
-bool AbslParseFlag(absl::string_view, UDT*, std::string*) { return true; }
-std::string AbslUnparseFlag(const UDT&) { return "UDT{}"; }
+static bool AbslParseFlag(absl::string_view, UDT*, std::string*) {
+  return true;
+}
+static std::string AbslUnparseFlag(const UDT&) { return "UDT{}"; }
 
 ABSL_FLAG(UDT, usage_reporting_test_flag_05, {},
           "usage_reporting_test_flag_05 help message");