diff --git a/lld/Common/ErrorHandler.cpp b/lld/Common/ErrorHandler.cpp
--- a/lld/Common/ErrorHandler.cpp
+++ b/lld/Common/ErrorHandler.cpp
@@ -242,6 +242,9 @@
     return;
   }
 
+  if (suppressWarnings)
+    return;
+
   std::lock_guard<std::mutex> lock(mu);
   reportDiagnostic(getLocation(msg), Colors::MAGENTA, "warning", msg);
   sep = getSeparator(msg);
diff --git a/lld/MachO/DriverUtils.cpp b/lld/MachO/DriverUtils.cpp
--- a/lld/MachO/DriverUtils.cpp
+++ b/lld/MachO/DriverUtils.cpp
@@ -87,6 +87,7 @@
   // Handle -fatal_warnings early since it converts missing argument warnings
   // to errors.
   errorHandler().fatalWarnings = args.hasArg(OPT_fatal_warnings);
+  errorHandler().suppressWarnings = args.hasArg(OPT_w);
 
   if (missingCount)
     error(Twine(args.getArgString(missingIndex)) + ": missing argument");
diff --git a/lld/MachO/Options.td b/lld/MachO/Options.td
--- a/lld/MachO/Options.td
+++ b/lld/MachO/Options.td
@@ -887,7 +887,6 @@
     Group<grp_rare>;
 def w : Flag<["-"], "w">,
     HelpText<"Suppress all warnings">,
-    Flags<[HelpHidden]>,
     Group<grp_rare>;
 def final_output : Separate<["-"], "final_output">,
     MetaVarName<"<name>">,
diff --git a/lld/include/lld/Common/ErrorHandler.h b/lld/include/lld/Common/ErrorHandler.h
--- a/lld/include/lld/Common/ErrorHandler.h
+++ b/lld/include/lld/Common/ErrorHandler.h
@@ -101,6 +101,7 @@
   StringRef logName = "lld";
   bool exitEarly = true;
   bool fatalWarnings = false;
+  bool suppressWarnings = false;
   bool verbose = false;
   bool vsDiagnostics = false;
   bool disableOutput = false;
diff --git a/lld/test/MachO/fatal-warnings.s b/lld/test/MachO/fatal-warnings.s
--- a/lld/test/MachO/fatal-warnings.s
+++ b/lld/test/MachO/fatal-warnings.s
@@ -6,6 +6,12 @@
 # RUN: not %no-fatal-warnings-lld %t1.o -fatal_warnings -o /dev/null \
 # RUN:     -single_module 2>&1 | FileCheck -check-prefix=ERROR %s
 
+# RUN: %no-fatal-warnings-lld %t1.o -w -o /dev/null -single_module 2>&1 \
+# RUN:     | count 0
+# RUN: not %no-fatal-warnings-lld %t1.o -fatal_warnings -w -o /dev/null \
+# RUN:     -single_module 2>&1 \
+# RUN:     | FileCheck --check-prefix=ERROR %s
+
 # ERROR: error: Option `-single_module' is deprecated
 # WARNING: warning: Option `-single_module' is deprecated