Index: compiler-rt/trunk/test/lsan/lit.common.cfg
===================================================================
--- compiler-rt/trunk/test/lsan/lit.common.cfg
+++ compiler-rt/trunk/test/lsan/lit.common.cfg
@@ -34,6 +34,13 @@
 
 # Platform-specific default LSAN_OPTIONS for lit tests.
 default_lsan_opts = ''
+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'.
+  # Also, make sure we do not overwhelm the syslog while testing.
+  default_lsan_opts = 'abort_on_error=0'
+  default_lsan_opts += ':log_to_syslog=0'
+
 if default_lsan_opts:
   config.environment['LSAN_OPTIONS'] = default_lsan_opts
   default_lsan_opts += ':'