Index: clang-tidy/modernize/AvoidCArraysCheck.h
===================================================================
--- /dev/null
+++ clang-tidy/modernize/AvoidCArraysCheck.h
@@ -0,0 +1,35 @@
+//===--- AvoidCArraysCheck.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_MODERNIZE_AVOIDCARRAYSCHECK_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MODERNIZE_AVOIDCARRAYSCHECK_H
+
+#include "../ClangTidy.h"
+
+namespace clang {
+namespace tidy {
+namespace modernize {
+
+/// Find C-style array declarations and recommend to use std::array<>.
+///
+/// For the user-facing documentation see:
+/// http://clang.llvm.org/extra/clang-tidy/checks/modernize-avoid-c-arrays.html
+class AvoidCArraysCheck : public ClangTidyCheck {
+public:
+  AvoidCArraysCheck(StringRef Name, ClangTidyContext *Context)
+      : ClangTidyCheck(Name, Context) {}
+  void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+  void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+};
+
+} // namespace modernize
+} // namespace tidy
+} // namespace clang
+
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MODERNIZE_AVOIDCARRAYSCHECK_H
Index: clang-tidy/modernize/AvoidCArraysCheck.cpp
===================================================================
--- /dev/null
+++ clang-tidy/modernize/AvoidCArraysCheck.cpp
@@ -0,0 +1,57 @@
+//===--- AvoidCArraysCheck.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 "AvoidCArraysCheck.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+
+using namespace clang::ast_matchers;
+
+namespace {
+
+AST_MATCHER(clang::TypeLoc, hasValidBeginLoc) {
+  return Node.getBeginLoc().isValid();
+}
+
+AST_MATCHER_P(clang::TypeLoc, hasType,
+              clang::ast_matchers::internal::Matcher<clang::Type>,
+              InnerMatcher) {
+  const clang::Type *TypeNode = Node.getTypePtr();
+  return (TypeNode != nullptr &&
+          InnerMatcher.matches(*TypeNode, Finder, Builder));
+}
+
+} // namespace
+
+namespace clang {
+namespace tidy {
+namespace modernize {
+
+void AvoidCArraysCheck::registerMatchers(MatchFinder *Finder) {
+  // std::array<> is avaliable since C++11.
+  if (!getLangOpts().CPlusPlus11)
+    return;
+
+  Finder->addMatcher(
+      typeLoc(hasValidBeginLoc(), hasType(arrayType()),
+              unless(anyOf(hasParent(varDecl(isExternC())),
+                           hasAncestor(functionDecl(isExternC())))))
+          .bind("typeloc"),
+      this);
+}
+
+void AvoidCArraysCheck::check(const MatchFinder::MatchResult &Result) {
+  const auto *ArrayType = Result.Nodes.getNodeAs<TypeLoc>("typeloc");
+  diag(ArrayType->getBeginLoc(),
+       "do not declare C-style arrays, use std::array<> instead");
+}
+
+} // namespace modernize
+} // namespace tidy
+} // namespace clang
Index: clang-tidy/modernize/CMakeLists.txt
===================================================================
--- clang-tidy/modernize/CMakeLists.txt
+++ clang-tidy/modernize/CMakeLists.txt
@@ -2,6 +2,7 @@
 
 add_clang_library(clangTidyModernizeModule
   AvoidBindCheck.cpp
+  AvoidCArraysCheck.cpp
   ConcatNestedNamespacesCheck.cpp
   DeprecatedHeadersCheck.cpp
   DeprecatedIosBaseAliasesCheck.cpp
Index: clang-tidy/modernize/ModernizeTidyModule.cpp
===================================================================
--- clang-tidy/modernize/ModernizeTidyModule.cpp
+++ clang-tidy/modernize/ModernizeTidyModule.cpp
@@ -11,6 +11,7 @@
 #include "../ClangTidyModule.h"
 #include "../ClangTidyModuleRegistry.h"
 #include "AvoidBindCheck.h"
+#include "AvoidCArraysCheck.h"
 #include "ConcatNestedNamespacesCheck.h"
 #include "DeprecatedHeadersCheck.h"
 #include "DeprecatedIosBaseAliasesCheck.h"
@@ -48,6 +49,7 @@
 public:
   void addCheckFactories(ClangTidyCheckFactories &CheckFactories) override {
     CheckFactories.registerCheck<AvoidBindCheck>("modernize-avoid-bind");
+    CheckFactories.registerCheck<AvoidCArraysCheck>("modernize-avoid-c-arrays");
     CheckFactories.registerCheck<ConcatNestedNamespacesCheck>(
         "modernize-concat-nested-namespaces");
     CheckFactories.registerCheck<DeprecatedHeadersCheck>(
Index: docs/ReleaseNotes.rst
===================================================================
--- docs/ReleaseNotes.rst
+++ docs/ReleaseNotes.rst
@@ -123,6 +123,11 @@
   but also have logic (non-static member functions), and diagnoses all member
   variables that have any other scope other than ``private``.
 
+- New :doc:`modernize-avoid-c-arrays
+  <clang-tidy/checks/modernize-avoid-c-arrays>` check.
+
+  Finds C-style array declarations and recommend to use ``std::array<>``.
+
 - New :doc:`modernize-concat-nested-namespaces
   <clang-tidy/checks/modernize-concat-nested-namespaces>` check.
 
Index: docs/clang-tidy/checks/list.rst
===================================================================
--- docs/clang-tidy/checks/list.rst
+++ docs/clang-tidy/checks/list.rst
@@ -178,6 +178,7 @@
    misc-unused-parameters
    misc-unused-using-decls
    modernize-avoid-bind
+   modernize-avoid-c-arrays
    modernize-concat-nested-namespaces
    modernize-deprecated-headers
    modernize-deprecated-ios-base-aliases
Index: docs/clang-tidy/checks/modernize-avoid-c-arrays.rst
===================================================================
--- /dev/null
+++ docs/clang-tidy/checks/modernize-avoid-c-arrays.rst
@@ -0,0 +1,53 @@
+.. title:: clang-tidy - modernize-avoid-c-arrays
+
+modernize-avoid-c-arrays
+===================
+
+Finds C-style array declarations and recommend to use ``std::array<>``.
+All types of C arrays are diagnosed.
+
+However, no fix-its are provided. Such transform would need to be able to
+observe *all* the uses of said declaration in order to decide whether it is
+safe to transform or not, and that is impossible in case of headers.
+
+.. code:: c++
+
+  int a[] = {1, 2}; // warning: do not declare C-style arrays, use std::array<> instead
+
+  int b[1]; // warning: do not declare C-style arrays, use std::array<> instead
+
+  void foo() {
+    int c[b[0]]; // warning: do not declare C-style arrays, use std::array<> instead
+  }
+
+  template <typename T, int Size>
+  class array {
+    T d[Size]; // warning: do not declare C-style arrays, use std::array<> instead
+
+    int e[1]; // warning: do not declare C-style arrays, use std::array<> instead
+  };
+
+  array<int[4], 2> d; // warning: do not declare C-style arrays, use std::array<> instead
+
+  using k = int[4]; // warning: do not declare C-style arrays, use std::array<> instead
+
+
+However, the ``extern "C"`` code is ignored, since it is common to share
+such headers between C code, and C++ code.
+
+.. code:: c++
+
+  // Some header
+  extern "C" {
+
+  int f[] = {1, 2}; // not diagnosed
+
+  int j[1]; // not diagnosed
+
+  inline void bar() {
+    {
+      int j[j[0]]; // not diagnosed
+    }
+  }
+
+  }
Index: test/clang-tidy/modernize-avoid-c-arrays.cpp
===================================================================
--- /dev/null
+++ test/clang-tidy/modernize-avoid-c-arrays.cpp
@@ -0,0 +1,59 @@
+// RUN: %check_clang_tidy %s modernize-avoid-c-arrays %t
+
+int a[] = {1, 2};
+// CHECK-MESSAGES: :[[@LINE-1]]:1: warning: do not declare C-style arrays, use std::array<> instead
+
+int b[1];
+// CHECK-MESSAGES: :[[@LINE-1]]:1: warning: do not declare C-style arrays, use std::array<> instead
+
+void foo() {
+  int c[b[0]];
+  // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: do not declare C-style arrays, use std::array<> instead
+}
+
+template <typename T, int Size>
+class array {
+  T d[Size];
+  // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: do not declare C-style arrays, use std::array<> instead
+
+  int e[1];
+  // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: do not declare C-style arrays, use std::array<> instead
+};
+
+array<int[4], 2> d;
+// CHECK-MESSAGES: :[[@LINE-1]]:7: warning: do not declare C-style arrays, use std::array<> instead
+
+using k = int[4];
+// CHECK-MESSAGES: :[[@LINE-1]]:11: warning: do not declare C-style arrays, use std::array<> instead
+
+array<k, 2> dk;
+
+template <typename T>
+class unique_ptr {
+  T *d;
+
+  int e[1];
+  // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: do not declare C-style arrays, use std::array<> instead
+};
+
+unique_ptr<int[]> d2;
+// CHECK-MESSAGES: :[[@LINE-1]]:12: warning: do not declare C-style arrays, use std::array<> instead
+
+using k2 = int[];
+// CHECK-MESSAGES: :[[@LINE-1]]:12: warning: do not declare C-style arrays, use std::array<> instead
+
+unique_ptr<k2> dk2;
+
+// Some header
+extern "C" {
+
+int f[] = {1, 2};
+
+int j[1];
+
+inline void bar() {
+  {
+    int j[j[0]];
+  }
+}
+}