Index: clang-tidy/fuchsia/AddVisibilityCheck.h
===================================================================
--- /dev/null
+++ clang-tidy/fuchsia/AddVisibilityCheck.h
@@ -0,0 +1,42 @@
+//===--- AddVisibilityCheck.h - clang-tidy-----------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_FUCHSIA_ADDVISIBILITYCHECK_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_FUCHSIA_ADDVISIBILITYCHECK_H
+
+#include "../ClangTidy.h"
+
+namespace clang {
+namespace tidy {
+namespace fuchsia {
+
+/// Check to find a given named function and suggest a fix to add
+/// a __attribute__((visibility("hidden"))) to its definition.
+///
+/// For the user-facing documentation see:
+/// http://clang.llvm.org/extra/clang-tidy/checks/fuchsia-add-visibility.html
+class AddVisibilityCheck : public ClangTidyCheck {
+public:
+  AddVisibilityCheck(StringRef Name, ClangTidyContext *Context)
+      : ClangTidyCheck(Name, Context), Name(Options.get("Name", "")) {}
+  void storeOptions(ClangTidyOptions::OptionMap &Opts) override;
+  void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+  void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+
+private:
+	void loadNames();
+
+	std::string Name;
+};
+
+} // namespace fuchsia
+} // namespace tidy
+} // namespace clang
+
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_FUCHSIA_ADDVISIBILITYCHECK_H
Index: clang-tidy/fuchsia/AddVisibilityCheck.cpp
===================================================================
--- /dev/null
+++ clang-tidy/fuchsia/AddVisibilityCheck.cpp
@@ -0,0 +1,49 @@
+//===--- AddVisibilityCheck.cpp - clang-tidy-------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "AddVisibilityCheck.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+#include "llvm/Support/ErrorOr.h"
+#include "llvm/Support/MemoryBuffer.h"
+
+using namespace clang::ast_matchers;
+
+namespace clang {
+namespace tidy {
+namespace fuchsia {
+
+AST_MATCHER(FunctionDecl, hasVisibilityAttr) {
+  return Node.getLinkageAndVisibility().isVisibilityExplicit();
+}
+
+void AddVisibilityCheck::storeOptions(ClangTidyOptions::OptionMap &Opts) {
+  Options.store(Opts, "Name", Name);
+}
+
+void AddVisibilityCheck::registerMatchers(MatchFinder *Finder) {
+  if (Name.empty()) return;
+  Finder->addMatcher(functionDecl(allOf(hasName(Name), isDefinition(),
+                                        unless(hasVisibilityAttr())))
+                         .bind("x"),
+                     this);
+}
+
+void AddVisibilityCheck::check(const MatchFinder::MatchResult &Result) {
+  const auto *MatchedDecl = Result.Nodes.getNodeAs<NamedDecl>("x");
+  diag(MatchedDecl->getLocStart(), "set visibility attr to hidden")
+      << MatchedDecl
+      << FixItHint::CreateInsertion(
+             MatchedDecl->getLocStart(),
+             "__attribute__((visibility(\"hidden\")))\n");
+}
+
+}  // namespace fuchsia
+}  // namespace tidy
+}  // namespace clang
Index: clang-tidy/fuchsia/CMakeLists.txt
===================================================================
--- clang-tidy/fuchsia/CMakeLists.txt
+++ clang-tidy/fuchsia/CMakeLists.txt
@@ -1,6 +1,7 @@
 set(LLVM_LINK_COMPONENTS support)
 
 add_clang_library(clangTidyFuchsiaModule
+  AddVisibilityCheck.cpp
   DefaultArgumentsCheck.cpp
   FuchsiaTidyModule.cpp
   MultipleInheritanceCheck.cpp
Index: clang-tidy/fuchsia/FuchsiaTidyModule.cpp
===================================================================
--- clang-tidy/fuchsia/FuchsiaTidyModule.cpp
+++ clang-tidy/fuchsia/FuchsiaTidyModule.cpp
@@ -10,6 +10,7 @@
 #include "../ClangTidy.h"
 #include "../ClangTidyModule.h"
 #include "../ClangTidyModuleRegistry.h"
+#include "AddVisibilityCheck.h"
 #include "DefaultArgumentsCheck.h"
 #include "MultipleInheritanceCheck.h"
 #include "OverloadedOperatorCheck.h"
@@ -27,6 +28,8 @@
 class FuchsiaModule : public ClangTidyModule {
 public:
   void addCheckFactories(ClangTidyCheckFactories &CheckFactories) override {
+    CheckFactories.registerCheck<AddVisibilityCheck>(
+        "fuchsia-add-visibility");
     CheckFactories.registerCheck<DefaultArgumentsCheck>(
         "fuchsia-default-arguments");
     CheckFactories.registerCheck<MultipleInheritanceCheck>(
Index: docs/ReleaseNotes.rst
===================================================================
--- docs/ReleaseNotes.rst
+++ docs/ReleaseNotes.rst
@@ -57,6 +57,12 @@
 Improvements to clang-tidy
 --------------------------
 
+- New `fuchsia-add-visibility
+  <http://clang.llvm.org/extra/clang-tidy/checks/fuchsia-add-visibility.html>`_ check
+
+  Check to find a given named function and suggest a fix to add a
+  `__attribute__((visibility("hidden")))` to its definition.
+
 - The 'misc-incorrect-roundings' check was renamed to `bugprone-incorrect-roundings
   <http://clang.llvm.org/extra/clang-tidy/checks/bugprone-incorrect-roundings.html>`_
 
Index: docs/clang-tidy/checks/fuchsia-add-visibility.rst
===================================================================
--- /dev/null
+++ docs/clang-tidy/checks/fuchsia-add-visibility.rst
@@ -0,0 +1,21 @@
+.. title:: clang-tidy - fuchsia-add-visibility
+
+fuchsia-add-visibility
+======================
+
+Check to find a given named function and suggest a fix to add
+a `__attribute__((visibility("hidden")))` to its definition.
+
+For example, given the name 'func':
+
+.. code-block:: c++
+
+  void func() {}
+
+would be changed to 
+
+.. code-block:: c++
+
+  __attribute__((visibility("hidden")))
+  void func() {}
+  
\ No newline at end of file
Index: docs/clang-tidy/checks/list.rst
===================================================================
--- docs/clang-tidy/checks/list.rst
+++ docs/clang-tidy/checks/list.rst
@@ -71,6 +71,7 @@
    cppcoreguidelines-pro-type-vararg
    cppcoreguidelines-slicing
    cppcoreguidelines-special-member-functions
+   fuchsia-add-visibility
    fuchsia-default-arguments
    fuchsia-multiple-inheritance
    fuchsia-overloaded-operator
Index: test/clang-tidy/fuchsia-add-visibility.cpp
===================================================================
--- /dev/null
+++ test/clang-tidy/fuchsia-add-visibility.cpp
@@ -0,0 +1,10 @@
+// RUN: %check_clang_tidy %s fuchsia-add-visibility %t -- \
+// RUN:   -config="{CheckOptions: [{key: fuchsia-add-visibility.Name, value: 'foo'}]}" \
+// RUN:   -- -std=c++11
+
+void foo();
+
+void foo() {}
+// CHECK-MESSAGES: [[@LINE-1]]:1: warning: set visibility attr to hidden
+// CHECK-FIXES: __attribute__((visibility("hidden")))
+