[compiler-rt][rtsan] Use Die instead of exit, define cf.exitcode

compiler-rt/lib/rtsan/rtsan_context.cpp

@@ -62,7 +62,7 @@ static __rtsan::Context &GetContextForThisThreadImpl() {
     Until then, and to keep the first PRs small, only the exit mode
     is available.
 */
-static void InvokeViolationDetectedAction() { exit(EXIT_FAILURE); }
+static void InvokeViolationDetectedAction() { Die(); }
 
 __rtsan::Context::Context() = default;
 

compiler-rt/lib/rtsan/rtsan_flags.cpp

@@ -35,6 +35,7 @@ void __rtsan::InitializeFlags() {
   {
     CommonFlags cf;
     cf.CopyFrom(*common_flags());
+    cf.exitcode = 43;
     cf.external_symbolizer_path = GetEnv("RTSAN_SYMBOLIZER_PATH");
     OverrideCommonFlags(cf);
   }

compiler-rt/lib/rtsan/tests/rtsan_test_main.cpp

@@ -8,8 +8,25 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "sanitizer_common/sanitizer_platform.h"
 #include "sanitizer_test_utils.h"
 
+// Default RTSAN_OPTIONS for the unit tests.
+extern "C" const char *__rtsan_default_options() {
+#if SANITIZER_APPLE
+  // On Darwin, we default to `abort_on_error=1`, which would make tests run
+  // much slower. Let's override this and run lit tests with 'abort_on_error=0'
+  // and make sure we do not overwhelm the syslog while testing. Also, let's
+  // turn symbolization off to speed up testing, especially when not running
+  // with llvm-symbolizer but with atos.
+  return "symbolize=false:abort_on_error=0:log_to_syslog=0";
+#else
+  // Let's turn symbolization off to speed up testing (more than 3 times speedup
+  // observed).
+  return "symbolize=false";
+#endif
+}
+
 int main(int argc, char **argv) {
   testing::GTEST_FLAG(death_test_style) = "threadsafe";
   testing::InitGoogleTest(&argc, argv);

compiler-rt/lib/rtsan/tests/rtsan_test_utilities.h

@@ -37,8 +37,8 @@ void ExpectRealtimeDeath(Function &&Func,
                : "";
   };
 
-  EXPECT_EXIT(RealtimeInvoke(std::forward<Function>(Func)),
-              ExitedWithCode(EXIT_FAILURE), GetExpectedErrorSubstring());
+  EXPECT_EXIT(RealtimeInvoke(std::forward<Function>(Func)), ExitedWithCode(43),
+              GetExpectedErrorSubstring());
 }
 
 template <typename Function> void ExpectNonRealtimeSurvival(Function &&Func) {

compiler-rt/test/rtsan/lit.cfg.py

@@ -3,6 +3,22 @@
 # Setup config name.
 config.name = "RTSAN" + config.name_suffix
 
+
+default_rtsan_opts = "atexit_sleep_ms=0"
+
+if config.host_os == "Darwin":
+    # On Darwin, we default to `abort_on_error=1`, which would make tests run
+    # much slower. Let's override this and run lit tests with 'abort_on_error=0'.
+    default_rtsan_opts += ":abort_on_error=0"
+
+if default_rtsan_opts:
+    config.environment["RTSAN_OPTIONS"] = default_rtsan_opts
+    default_rtsan_opts += ":"
+
+config.substitutions.append(
+    ("%env_rtsan_opts=", "env RTSAN_OPTIONS=" + default_rtsan_opts)
+)
+
 # Setup source root.
 config.test_source_root = os.path.dirname(__file__)