Index: llvm/utils/lit/lit/cl_arguments.py
===================================================================
--- llvm/utils/lit/lit/cl_arguments.py
+++ llvm/utils/lit/lit/cl_arguments.py
@@ -130,6 +130,10 @@
     execution_group.add_argument("--allow-empty-runs",
             help="Do not fail the run if all tests are filtered out",
             action="store_true")
+    execution_group.add_argument("--ignore-fail",
+            dest="ignoreFail",
+            action="store_true",
+            help="Exit with status zero even if some tests fail")
     execution_group.add_argument("--no-indirectly-run-check",
             dest="indirectlyRunCheck",
             help="Do not error if a test would not be run if the user had "
Index: llvm/utils/lit/lit/main.py
===================================================================
--- llvm/utils/lit/lit/main.py
+++ llvm/utils/lit/lit/main.py
@@ -118,8 +118,11 @@
 
     has_failure = any(t.isFailure() for t in discovered_tests)
     if has_failure:
-        sys.exit(1)
-
+        if opts.ignoreFail:
+            sys.stderr.write("\nExiting with status 0 instead of 1 because "
+                             "'--ignore-fail' was specified.\n")
+        else:
+            sys.exit(1)
 
 def create_params(builtin_params, user_params):
     def parse(p):
Index: llvm/utils/lit/tests/Inputs/ignore-fail/fail.txt
===================================================================
--- /dev/null
+++ llvm/utils/lit/tests/Inputs/ignore-fail/fail.txt
@@ -0,0 +1 @@
+RUN: false
Index: llvm/utils/lit/tests/Inputs/ignore-fail/lit.cfg
===================================================================
--- /dev/null
+++ llvm/utils/lit/tests/Inputs/ignore-fail/lit.cfg
@@ -0,0 +1,6 @@
+import lit.formats
+config.name = 'ignore-fail'
+config.suffixes = ['.txt']
+config.test_format = lit.formats.ShTest()
+config.test_source_root = None
+config.test_exec_root = None
Index: llvm/utils/lit/tests/Inputs/ignore-fail/xfail.txt
===================================================================
--- /dev/null
+++ llvm/utils/lit/tests/Inputs/ignore-fail/xfail.txt
@@ -0,0 +1,2 @@
+RUN: false
+XFAIL: *
Index: llvm/utils/lit/tests/Inputs/ignore-fail/xpass.txt
===================================================================
--- /dev/null
+++ llvm/utils/lit/tests/Inputs/ignore-fail/xpass.txt
@@ -0,0 +1,2 @@
+RUN: true
+XFAIL: *
Index: llvm/utils/lit/tests/ignore-fail.py
===================================================================
--- /dev/null
+++ llvm/utils/lit/tests/ignore-fail.py
@@ -0,0 +1,19 @@
+# Check that --ignore-fail produces exit status 0 despite various kinds of
+# test failures but doesn't otherwise suppress those failures.
+
+# RUN: not %{lit} -j 1 %{inputs}/ignore-fail | FileCheck %s
+# RUN: %{lit} -j 1 --ignore-fail %{inputs}/ignore-fail | FileCheck %s
+
+# END.
+
+# CHECK: FAIL: ignore-fail :: fail.txt
+# CHECK: UNRESOLVED: ignore-fail :: unresolved.txt
+# CHECK: XFAIL: ignore-fail :: xfail.txt
+# CHECK: XPASS: ignore-fail :: xpass.txt
+
+#      CHECK: Testing Time:
+# CHECK-NEXT:   Expectedly Failed : 1
+# CHECK-NEXT:   Unresolved : 1
+# CHECK-NEXT:   Failed : 1
+# CHECK-NEXT:   Unexpectedly Passed: 1
+#  CHECK-NOT: {{.}}