Export of internal Abseil changes.

--
36d990031b4ae8e2debaccca63ff41829383a7d2 by Derek Mauro <dmauro@google.com>:

Rename FailureSignalHandler to AbslFailureSignalHandler so that we
don't confuse poor souls.

PiperOrigin-RevId: 207539530

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0ced19ef8e0e0887f9809ffb88c5ef5f8746a6aa by Abseil Team <absl-team@google.com>:

Minor changes to support WebAssembly.

PiperOrigin-RevId: 207286743
GitOrigin-RevId: 36d990031b4ae8e2debaccca63ff41829383a7d2
Change-Id: I6b86713e96f5c32b595171594e456e38c898e601

absl/base/internal/exception_testing.h

@@ -35,7 +35,7 @@
   EXPECT_DEATH(expr, ".*")
 #else
 #define ABSL_BASE_INTERNAL_EXPECT_FAIL(expr, exception_t, text) \
-  EXPECT_DEATH(expr, text)
+  EXPECT_DEATH_IF_SUPPORTED(expr, text)
 
 #endif
 

absl/debugging/failure_signal_handler.cc

@@ -252,7 +252,7 @@ ABSL_ATTRIBUTE_NOINLINE static void WriteStackTrace(
       depth, min_dropped_frames, symbolize_stacktrace, writerfn, writerfn_arg);
 }
 
-// Called by FailureSignalHandler() to write the failure info. It is
+// Called by AbslFailureSignalHandler() to write the failure info. It is
 // called once with writerfn set to WriteToStderr() and then possibly
 // with writerfn set to the user provided function.
 static void WriteFailureInfo(int signo, void* ucontext,
@@ -278,9 +278,9 @@ static void PortableSleepForSeconds(int seconds) {
 }
 
 #ifdef ABSL_HAVE_ALARM
-// FailureSignalHandler() installs this as a signal handler for
+// AbslFailureSignalHandler() installs this as a signal handler for
 // SIGALRM, then sets an alarm to be delivered to the program after a
-// set amount of time. If FailureSignalHandler() hangs for more than
+// set amount of time. If AbslFailureSignalHandler() hangs for more than
 // the alarm timeout, ImmediateAbortSignalHandler() will abort the
 // program.
 static void ImmediateAbortSignalHandler(int) {
@@ -294,11 +294,10 @@ using GetTidType = decltype(absl::base_internal::GetTID());
 ABSL_CONST_INIT static std::atomic<GetTidType> failed_tid(0);
 
 #ifndef ABSL_HAVE_SIGACTION
-static void FailureSignalHandler(int signo) {
+static void AbslFailureSignalHandler(int signo) {
   void* ucontext = nullptr;
 #else
-static void FailureSignalHandler(int signo, siginfo_t*,
-                                 void* ucontext) {
+static void AbslFailureSignalHandler(int signo, siginfo_t*, void* ucontext) {
 #endif
 
   const GetTidType this_tid = absl::base_internal::GetTID();
@@ -308,10 +307,10 @@ static void FailureSignalHandler(int signo, siginfo_t*,
           std::memory_order_acq_rel, std::memory_order_relaxed)) {
     ABSL_RAW_LOG(
         ERROR,
-        "Signal %d raised at PC=%p while already in FailureSignalHandler()",
+        "Signal %d raised at PC=%p while already in AbslFailureSignalHandler()",
         signo, absl::debugging_internal::GetProgramCounter(ucontext));
     if (this_tid != previous_failed_tid) {
-      // Another thread is already in FailureSignalHandler(), so wait
+      // Another thread is already in AbslFailureSignalHandler(), so wait
       // a bit for it to finish. If the other thread doesn't kill us,
       // we do so after sleeping.
       PortableSleepForSeconds(3);
@@ -349,7 +348,7 @@ static void FailureSignalHandler(int signo, siginfo_t*,
 void InstallFailureSignalHandler(const FailureSignalHandlerOptions& options) {
   fsh_options = options;
   for (auto& it : failure_signal_data) {
-    InstallOneFailureHandler(&it, FailureSignalHandler);
+    InstallOneFailureHandler(&it, AbslFailureSignalHandler);
   }
 }
 

absl/strings/numbers_test.cc

@@ -711,8 +711,9 @@ TEST(stringtest, safe_strtou64_base_length_delimited) {
   }
 }
 
-// feenableexcept() and fedisableexcept() are missing on Mac OS X, MSVC.
-#if defined(_MSC_VER) || defined(__APPLE__)
+// feenableexcept() and fedisableexcept() are missing on Mac OS X, MSVC,
+// and WebAssembly.
+#if defined(_MSC_VER) || defined(__APPLE__) || defined(__EMSCRIPTEN__)
 #define ABSL_MISSING_FEENABLEEXCEPT 1
 #define ABSL_MISSING_FEDISABLEEXCEPT 1
 #endif

absl/types/span_test.cc

@@ -288,7 +288,7 @@ TEST(IntSpan, Subspan) {
 #ifdef ABSL_HAVE_EXCEPTIONS
   EXPECT_THROW(absl::MakeSpan(ramp).subspan(11, 5), std::out_of_range);
 #else
-  EXPECT_DEATH(absl::MakeSpan(ramp).subspan(11, 5), "");
+  EXPECT_DEATH_IF_SUPPORTED(absl::MakeSpan(ramp).subspan(11, 5), "");
 #endif
 }