diff --git a/clang/docs/CommandGuide/clang.rst b/clang/docs/CommandGuide/clang.rst
--- a/clang/docs/CommandGuide/clang.rst
+++ b/clang/docs/CommandGuide/clang.rst
@@ -373,6 +373,10 @@
 
   Acts as an alias for :option:`--print-supported-cpus`.
 
+.. option:: -mcpu=help, -mtune=help
+
+  Acts as an alias for :option:`--print-supported-cpus`.
+
 .. option:: -march=<cpu>
 
   Specify that Clang should generate code for a specific processor family
diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -4347,6 +4347,8 @@
   MarshallingInfoFlag<FrontendOpts<"PrintSupportedCPUs">>;
 def mcpu_EQ_QUESTION : Flag<["-"], "mcpu=?">, Alias<print_supported_cpus>;
 def mtune_EQ_QUESTION : Flag<["-"], "mtune=?">, Alias<print_supported_cpus>;
+def mcpu_EQ_help : Flag<["-"], "mcpu=help">, Alias<print_supported_cpus>;
+def mtune_EQ_help : Flag<["-"], "mtune=help">, Alias<print_supported_cpus>;
 def time : Flag<["-"], "time">,
   HelpText<"Time individual commands">;
 def traditional_cpp : Flag<["-", "--"], "traditional-cpp">, Flags<[CC1Option]>,
diff --git a/clang/test/Driver/print-supported-cpus.c b/clang/test/Driver/print-supported-cpus.c
--- a/clang/test/Driver/print-supported-cpus.c
+++ b/clang/test/Driver/print-supported-cpus.c
@@ -13,6 +13,13 @@
 // RUN: %clang --target=x86_64-unknown-linux-gnu -mtune=? -fuse-ld=dummy 2>&1 | \
 // RUN:   FileCheck %s --check-prefix=CHECK-X86
 
+// Test -mcpu=help and -mtune=help alises.
+// RUN: %clang --target=x86_64-unknown-linux-gnu -mcpu=help 2>&1 | \
+// RUN:   FileCheck %s --check-prefix=CHECK-X86
+
+// RUN: %clang --target=x86_64-unknown-linux-gnu -mtune=help -fuse-ld=dummy 2>&1 | \
+// RUN:   FileCheck %s --check-prefix=CHECK-X86
+
 // CHECK-NOT: warning: argument unused during compilation
 // CHECK-X86: Target: x86_64-unknown-linux-gnu
 // CHECK-X86: corei7