Index: llvm/trunk/docs/CommandGuide/lit.rst
===================================================================
--- llvm/trunk/docs/CommandGuide/lit.rst
+++ llvm/trunk/docs/CommandGuide/lit.rst
@@ -80,6 +80,13 @@
  Show more information on test failures, for example the entire test output
  instead of just the test result.
 
+.. option:: -vv, --echo-all-commands
+
+ Echo all commands to stdout, as they are being executed.
+ This can be valuable for debugging test failures, as the last echoed command
+ will be the one which has failed.
+ This option implies ``--verbose``.
+
 .. option:: -a, --show-all
 
  Show more information about all tests, for example the entire test
Index: llvm/trunk/utils/lit/lit/LitConfig.py
===================================================================
--- llvm/trunk/utils/lit/lit/LitConfig.py
+++ llvm/trunk/utils/lit/lit/LitConfig.py
@@ -25,7 +25,8 @@
                  params, config_prefix = None,
                  maxIndividualTestTime = 0,
                  maxFailures = None,
-                 parallelism_groups = []):
+                 parallelism_groups = [],
+                 echo_all_commands = False):
         # The name of the test runner.
         self.progname = progname
         # The items to add to the PATH environment variable.
@@ -64,6 +65,7 @@
         self.maxIndividualTestTime = maxIndividualTestTime
         self.maxFailures = maxFailures
         self.parallelism_groups = parallelism_groups
+        self.echo_all_commands = echo_all_commands
 
     @property
     def maxIndividualTestTime(self):
Index: llvm/trunk/utils/lit/lit/TestRunner.py
===================================================================
--- llvm/trunk/utils/lit/lit/TestRunner.py
+++ llvm/trunk/utils/lit/lit/TestRunner.py
@@ -715,6 +715,8 @@
     else:
         if test.config.pipefail:
             f.write('set -o pipefail;')
+        if litConfig.echo_all_commands:
+            f.write('set -x;')
         f.write('{ ' + '; } &&\n{ '.join(commands) + '; }')
     f.write('\n')
     f.close()
Index: llvm/trunk/utils/lit/lit/main.py
===================================================================
--- llvm/trunk/utils/lit/lit/main.py
+++ llvm/trunk/utils/lit/lit/main.py
@@ -199,6 +199,12 @@
     format_group.add_argument("-v", "--verbose", dest="showOutput",
                      help="Show test output for failures",
                      action="store_true", default=False)
+    format_group.add_argument("-vv", "--echo-all-commands",
+                     dest="echoAllCommands",
+                     action="store_true", default=False,
+                     help="Echo all commands as they are executed to stdout.\
+                     In case of failure, last command shown will be the\
+                     failing one.")
     format_group.add_argument("-a", "--show-all", dest="showAllOutput",
                      help="Display all commandlines and output",
                      action="store_true", default=False)
@@ -303,6 +309,9 @@
     if opts.maxFailures == 0:
         parser.error("Setting --max-failures to 0 does not have any effect.")
 
+    if opts.echoAllCommands:
+        opts.showOutput = True
+
     inputs = args
 
     # Create the user defined parameters.
@@ -338,7 +347,8 @@
         config_prefix = opts.configPrefix,
         maxIndividualTestTime = maxIndividualTestTime,
         maxFailures = opts.maxFailures,
-        parallelism_groups = {})
+        parallelism_groups = {},
+        echo_all_commands = opts.echoAllCommands)
 
     # Perform test discovery.
     run = lit.run.Run(litConfig,