diff --git a/libcxx/utils/run.py b/libcxx/utils/run.py
--- a/libcxx/utils/run.py
+++ b/libcxx/utils/run.py
@@ -14,6 +14,7 @@
 """
 
 import argparse
+import shlex
 import subprocess
 import sys
 
@@ -23,6 +24,7 @@
     parser.add_argument('--execdir', type=str, required=True)
     parser.add_argument('--codesign_identity', type=str, required=False, default=None)
     parser.add_argument('--env', type=str, nargs='*', required=False, default=dict())
+    parser.add_argument('--wrapper-command', type=str, required=False, default=None)
     parser.add_argument("command", nargs=argparse.ONE_OR_MORE)
     args = parser.parse_args()
     commandLine = args.command
@@ -38,6 +40,9 @@
     # Extract environment variables into a dictionary
     env = {k : v  for (k, v) in map(lambda s: s.split('=', 1), args.env)}
 
+    # Prepend the wrapper command to allow running under GDB/LLDB/valgrind/qemu-user/etc.
+    if args.wrapper_command:
+        commandLine = shlex.split(args.wrapper_command) + commandLine
     # Run the command line with the given environment in the execution directory.
     return subprocess.call(subprocess.list2cmdline(commandLine), cwd=args.execdir, env=env, shell=True)
 
diff --git a/libcxx/utils/ssh.py b/libcxx/utils/ssh.py
--- a/libcxx/utils/ssh.py
+++ b/libcxx/utils/ssh.py
@@ -45,6 +45,7 @@
     parser.add_argument('--extra-scp-args', type=str, required=False)
     parser.add_argument('--codesign_identity', type=str, required=False, default=None)
     parser.add_argument('--env', type=str, nargs='*', required=False, default=dict())
+    parser.add_argument('--wrapper-command', type=str, required=False, default=None)
     parser.add_argument("command", nargs=argparse.ONE_OR_MORE)
     args = parser.parse_args()
     commandLine = args.command
@@ -104,6 +105,9 @@
         # host by transforming the path of test-executables to their path in the
         # temporary directory on the remote host.
         commandLine = (pathOnRemote(x) if isTestExe(x) else x for x in commandLine)
+        # Prepend the wrapper command to allow running under GDB/LLDB/valgrind/qemu-user/etc.
+        if args.wrapper_command:
+            commandLine = shlex.split(args.wrapper_command) + list(commandLine)
         remoteCommands.append('cd {}'.format(tmp))
         if args.env:
             remoteCommands.append('export {}'.format(' '.join(args.env)))