Add CMake build support.

Fixes https://github.com/google/leveldb/issues/466

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=189425354

8 files changed, 493 insertions, 47 deletions

diff --git a/.travis.yml b/.travis.yml
index 77ea0a3..5999274 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,6 +13,10 @@ os:
   - linux
   - osx
 
+env:
+  - BUILD_TYPE=Debug
+  - BUILD_TYPE=RelWithDebInfo
+
 addons:
   apt:
     # List of whitelisted in travis packages for ubuntu-trusty can be found here:
@@ -23,6 +27,7 @@ addons:
     - ubuntu-toolchain-r-test
     - llvm-toolchain-trusty-5.0
     packages:
+    - cmake
     - gcc-7
     - g++-7
     - clang-5.0
@@ -49,6 +54,16 @@ install:
 - echo ${CC}
 - echo ${CXX}
 - ${CXX} --version
+- cmake --version
+
+before_script:
+- mkdir -p build && cd build
+- cmake .. -DCMAKE_BUILD_TYPE=$BUILD_TYPE
+- cmake --build .
+- cd ..
 
 script:
-- make -j 4 check
+- cd build ; ctest --verbose ; cd ..
+- "if [ -f build/db_bench ] ; then build/db_bench ; fi"
+- "if [ -f build/db_bench_sqlite3 ] ; then build/db_bench_sqlite3 ; fi"
+- "if [ -f build/db_bench_tree_db ] ; then build/db_bench_tree_db ; fi"
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..df486ea
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,412 @@
+# Copyright 2017 The LevelDB Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file. See the AUTHORS file for names of contributors.
+
+cmake_minimum_required(VERSION 3.9)
+project(Leveldb VERSION 0.1.0 LANGUAGES C CXX)
+
+# This project can take advantage of C++11.
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED OFF)
+set(CMAKE_CXX_EXTENSIONS OFF)
+
+option(LEVELDB_BUILD_TESTS "Build LevelDB's unit tests" ON)
+option(LEVELDB_BUILD_BENCHMARKS "Build LevelDB's benchmarks" ON)
+option(LEVELDB_INSTALL "Install LevelDB's header and library" ON)
+
+include(TestBigEndian)
+test_big_endian(LEVELDB_IS_BIG_ENDIAN)
+
+include(CheckIncludeFile)
+check_include_file("unistd.h" HAVE_UNISTD_H)
+
+include(CheckIncludeFileCXX)
+check_include_file_cxx("atomic" LEVELDB_ATOMIC_PRESENT)
+
+include(CheckLibraryExists)
+check_library_exists(crc32c crc32c_value "" HAVE_CRC32C)
+check_library_exists(snappy snappy_compress "" HAVE_SNAPPY)
+check_library_exists(tcmalloc malloc "" HAVE_TCMALLOC)
+
+include(CheckSymbolExists)
+check_symbol_exists(fdatasync "unistd.h" HAVE_FDATASYNC)
+
+include(CheckCXXSourceCompiles)
+
+# Test whether -Wthread-safety is available. See
+# https://clang.llvm.org/docs/ThreadSafetyAnalysis.html
+# -Werror is necessary because unknown attributes only generate warnings.
+set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
+list(APPEND CMAKE_REQUIRED_FLAGS -Werror -Wthread-safety)
+check_cxx_source_compiles("
+struct __attribute__((lockable)) Lock {
+  void Acquire() __attribute__((exclusive_lock_function()));
+  void Release() __attribute__((unlock_function()));
+};
+struct ThreadSafeType {
+  Lock lock_;
+  int data_ __attribute__((guarded_by(lock_)));
+};
+int main() { return 0; }
+"  HAVE_CLANG_THREAD_SAFETY)
+set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
+
+set(LEVELDB_PUBLIC_INCLUDE_DIR "include/leveldb")
+set(LEVELDB_PORT_CONFIG_DIR "include/port")
+
+configure_file(
+  "${PROJECT_SOURCE_DIR}/port/port_config.h.in"
+  "${PROJECT_BINARY_DIR}/${LEVELDB_PORT_CONFIG_DIR}/port_config.h"
+)
+
+include_directories(
+  "${PROJECT_BINARY_DIR}/include"
+  "${PROJECT_SOURCE_DIR}"
+)
+
+if(BUILD_SHARED_LIBS)
+  # Only export LEVELDB_EXPORT symbols from the shared library.
+  add_compile_options(-fvisibility=hidden)
+endif(BUILD_SHARED_LIBS)
+
+# POSIX code is specified separately so we can leave it out in the future.
+add_library(leveldb_port_posix OBJECT "")
+target_sources(leveldb_port_posix
+  PRIVATE
+    "${PROJECT_SOURCE_DIR}/port/port_posix.cc"
+
+  PUBLIC
+    # The headers below are dependencies for leveldb, but aren't needed by users
+    # that link to the installed version of leveldb and rely on its public API.
+    $<BUILD_INTERFACE:${PROJECT_BINARY_DIR}/${LEVELDB_PORT_CONFIG_DIR}/port_config.h>
+    $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/port/atomic_pointer.h>
+    $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/port/port_posix.h>
+    $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/port/port.h>
+)
+if(BUILD_SHARED_LIBS)
+  set_property(TARGET leveldb_port_posix PROPERTY POSITION_INDEPENDENT_CODE ON)
+endif(BUILD_SHARED_LIBS)
+
+add_library(leveldb "")
+target_sources(leveldb
+  PRIVATE
+    "${PROJECT_SOURCE_DIR}/db/builder.cc"
+    "${PROJECT_SOURCE_DIR}/db/builder.h"
+    "${PROJECT_SOURCE_DIR}/db/c.cc"
+    "${PROJECT_SOURCE_DIR}/db/db_impl.cc"
+    "${PROJECT_SOURCE_DIR}/db/db_impl.h"
+    "${PROJECT_SOURCE_DIR}/db/db_iter.cc"
+    "${PROJECT_SOURCE_DIR}/db/db_iter.h"
+    "${PROJECT_SOURCE_DIR}/db/dbformat.cc"
+    "${PROJECT_SOURCE_DIR}/db/dbformat.h"
+    "${PROJECT_SOURCE_DIR}/db/dumpfile.cc"
+    "${PROJECT_SOURCE_DIR}/db/filename.cc"
+    "${PROJECT_SOURCE_DIR}/db/filename.h"
+    "${PROJECT_SOURCE_DIR}/db/log_format.h"
+    "${PROJECT_SOURCE_DIR}/db/log_reader.cc"
+    "${PROJECT_SOURCE_DIR}/db/log_reader.h"
+    "${PROJECT_SOURCE_DIR}/db/log_writer.cc"
+    "${PROJECT_SOURCE_DIR}/db/log_writer.h"
+    "${PROJECT_SOURCE_DIR}/db/memtable.cc"
+    "${PROJECT_SOURCE_DIR}/db/memtable.h"
+    "${PROJECT_SOURCE_DIR}/db/repair.cc"
+    "${PROJECT_SOURCE_DIR}/db/skiplist.h"
+    "${PROJECT_SOURCE_DIR}/db/snapshot.h"
+    "${PROJECT_SOURCE_DIR}/db/table_cache.cc"
+    "${PROJECT_SOURCE_DIR}/db/table_cache.h"
+    "${PROJECT_SOURCE_DIR}/db/version_edit.cc"
+    "${PROJECT_SOURCE_DIR}/db/version_edit.h"
+    "${PROJECT_SOURCE_DIR}/db/version_set.cc"
+    "${PROJECT_SOURCE_DIR}/db/version_set.h"
+    "${PROJECT_SOURCE_DIR}/db/write_batch_internal.h"
+    "${PROJECT_SOURCE_DIR}/db/write_batch.cc"
+    "${PROJECT_SOURCE_DIR}/port/port.h"
+    "${PROJECT_SOURCE_DIR}/port/thread_annotations.h"
+    "${PROJECT_SOURCE_DIR}/table/block_builder.cc"
+    "${PROJECT_SOURCE_DIR}/table/block_builder.h"
+    "${PROJECT_SOURCE_DIR}/table/block.cc"
+    "${PROJECT_SOURCE_DIR}/table/block.h"
+    "${PROJECT_SOURCE_DIR}/table/filter_block.cc"
+    "${PROJECT_SOURCE_DIR}/table/filter_block.h"
+    "${PROJECT_SOURCE_DIR}/table/format.cc"
+    "${PROJECT_SOURCE_DIR}/table/format.h"
+    "${PROJECT_SOURCE_DIR}/table/iterator_wrapper.h"
+    "${PROJECT_SOURCE_DIR}/table/iterator.cc"
+    "${PROJECT_SOURCE_DIR}/table/merger.cc"
+    "${PROJECT_SOURCE_DIR}/table/merger.h"
+    "${PROJECT_SOURCE_DIR}/table/table_builder.cc"
+    "${PROJECT_SOURCE_DIR}/table/table.cc"
+    "${PROJECT_SOURCE_DIR}/table/two_level_iterator.cc"
+    "${PROJECT_SOURCE_DIR}/table/two_level_iterator.h"
+    "${PROJECT_SOURCE_DIR}/util/arena.cc"
+    "${PROJECT_SOURCE_DIR}/util/arena.h"
+    "${PROJECT_SOURCE_DIR}/util/bloom.cc"
+    "${PROJECT_SOURCE_DIR}/util/cache.cc"
+    "${PROJECT_SOURCE_DIR}/util/coding.cc"
+    "${PROJECT_SOURCE_DIR}/util/coding.h"
+    "${PROJECT_SOURCE_DIR}/util/comparator.cc"
+    "${PROJECT_SOURCE_DIR}/util/crc32c.cc"
+    "${PROJECT_SOURCE_DIR}/util/crc32c.h"
+    "${PROJECT_SOURCE_DIR}/util/env_posix.cc"
+    "${PROJECT_SOURCE_DIR}/util/env.cc"
+    "${PROJECT_SOURCE_DIR}/util/filter_policy.cc"
+    "${PROJECT_SOURCE_DIR}/util/hash.cc"
+    "${PROJECT_SOURCE_DIR}/util/hash.h"
+    "${PROJECT_SOURCE_DIR}/util/logging.cc"
+    "${PROJECT_SOURCE_DIR}/util/logging.h"
+    "${PROJECT_SOURCE_DIR}/util/mutexlock.h"
+    "${PROJECT_SOURCE_DIR}/util/options.cc"
+    "${PROJECT_SOURCE_DIR}/util/posix_logger.h"
+    "${PROJECT_SOURCE_DIR}/util/random.h"
+    "${PROJECT_SOURCE_DIR}/util/status.cc"
+    $<TARGET_OBJECTS:leveldb_port_posix>
+
+  # Only CMake 3.3+ supports PUBLIC sources in targets exported by "install".
+  $<$<VERSION_GREATER:CMAKE_VERSION,3.2>:PUBLIC>
+    "${LEVELDB_PUBLIC_INCLUDE_DIR}/c.h"
+    "${LEVELDB_PUBLIC_INCLUDE_DIR}/cache.h"
+    "${LEVELDB_PUBLIC_INCLUDE_DIR}/comparator.h"
+    "${LEVELDB_PUBLIC_INCLUDE_DIR}/db.h"
+    "${LEVELDB_PUBLIC_INCLUDE_DIR}/dumpfile.h"
+    "${LEVELDB_PUBLIC_INCLUDE_DIR}/env.h"
+    "${LEVELDB_PUBLIC_INCLUDE_DIR}/filter_policy.h"
+    "${LEVELDB_PUBLIC_INCLUDE_DIR}/iterator.h"
+    "${LEVELDB_PUBLIC_INCLUDE_DIR}/options.h"
+    "${LEVELDB_PUBLIC_INCLUDE_DIR}/slice.h"
+    "${LEVELDB_PUBLIC_INCLUDE_DIR}/status.h"
+    "${LEVELDB_PUBLIC_INCLUDE_DIR}/table_builder.h"
+    "${LEVELDB_PUBLIC_INCLUDE_DIR}/table.h"
+    "${LEVELDB_PUBLIC_INCLUDE_DIR}/write_batch.h"
+)
+# MemEnv is not part of the interface and could be pulled to a separate library.
+target_sources(leveldb
+  PRIVATE
+    "${PROJECT_SOURCE_DIR}/helpers/memenv/memenv.cc"
+    "${PROJECT_SOURCE_DIR}/helpers/memenv/memenv.h"
+)
+target_include_directories(leveldb
+  PUBLIC
+    $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>
+    $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+)
+target_compile_definitions(leveldb
+  PRIVATE
+    # Used by include/export.h when building shared libraries.
+    LEVELDB_COMPILE_LIBRARY
+    # Used by port/port.h.
+    LEVELDB_PLATFORM_POSIX=1
+)
+if(BUILD_SHARED_LIBS)
+  target_compile_definitions(leveldb
+    PUBLIC
+      # Used by include/export.h.
+      LEVELDB_SHARED_LIBRARY
+  )
+endif(BUILD_SHARED_LIBS)
+
+if(HAVE_CLANG_THREAD_SAFETY)
+  target_compile_options(leveldb
+    PUBLIC
+      -Werror -Wthread-safety)
+endif(HAVE_CLANG_THREAD_SAFETY)
+
+# TODO(costan): This is only needed for port_posix.
+set(THREADS_PREFER_PTHREAD_FLAG ON)
+find_package(Threads REQUIRED)
+target_link_libraries(leveldb Threads::Threads)
+
+if(HAVE_CRC32C)
+  target_link_libraries(leveldb crc32c)
+endif(HAVE_CRC32C)
+if(HAVE_SNAPPY)
+  target_link_libraries(leveldb snappy)
+endif(HAVE_SNAPPY)
+if(HAVE_TCMALLOC)
+  target_link_libraries(leveldb tcmalloc)
+endif(HAVE_TCMALLOC)
+
+add_executable(leveldbutil
+  "${PROJECT_SOURCE_DIR}/db/leveldbutil.cc"
+)
+target_link_libraries(leveldbutil leveldb)
+
+if(LEVELDB_BUILD_TESTS)
+  enable_testing()
+
+  function(leveldb_test test_file)
+    get_filename_component(test_target_name "${test_file}" NAME_WE)
+
+    add_executable("${test_target_name}" "")
+    target_sources("${test_target_name}"
+      PRIVATE
+        "${PROJECT_BINARY_DIR}/${LEVELDB_PORT_CONFIG_DIR}/port_config.h"
+        "${PROJECT_SOURCE_DIR}/util/testharness.cc"
+        "${PROJECT_SOURCE_DIR}/util/testharness.h"
+        "${PROJECT_SOURCE_DIR}/util/testutil.cc"
+        "${PROJECT_SOURCE_DIR}/util/testutil.h"
+
+        "${test_file}"
+    )
+    if(BUILD_SHARED_LIBS)
+      # Port functions aren't exposed in the shared library build.
+      target_sources("${test_target_name}"
+        PRIVATE
+          $<TARGET_OBJECTS:leveldb_port_posix>
+      )
+    endif(BUILD_SHARED_LIBS)
+
+    target_link_libraries("${test_target_name}" leveldb)
+    target_compile_definitions("${test_target_name}"
+      PRIVATE
+        LEVELDB_PLATFORM_POSIX=1
+    )
+
+    add_test(NAME "${test_target_name}" COMMAND "${test_target_name}")
+  endfunction(leveldb_test)
+
+  leveldb_test("${PROJECT_SOURCE_DIR}/db/c_test.c")
+  leveldb_test("${PROJECT_SOURCE_DIR}/db/fault_injection_test.cc")
+
+  leveldb_test("${PROJECT_SOURCE_DIR}/issues/issue178_test.cc")
+  leveldb_test("${PROJECT_SOURCE_DIR}/issues/issue200_test.cc")
+
+  leveldb_test("${PROJECT_SOURCE_DIR}/util/env_test.cc")
+
+  if(NOT BUILD_SHARED_LIBS)
+    leveldb_test("${PROJECT_SOURCE_DIR}/db/autocompact_test.cc")
+    leveldb_test("${PROJECT_SOURCE_DIR}/db/corruption_test.cc")
+    leveldb_test("${PROJECT_SOURCE_DIR}/db/db_test.cc")
+    leveldb_test("${PROJECT_SOURCE_DIR}/db/dbformat_test.cc")
+    leveldb_test("${PROJECT_SOURCE_DIR}/db/filename_test.cc")
+    leveldb_test("${PROJECT_SOURCE_DIR}/db/log_test.cc")
+    leveldb_test("${PROJECT_SOURCE_DIR}/db/recovery_test.cc")
+    leveldb_test("${PROJECT_SOURCE_DIR}/db/skiplist_test.cc")
+    leveldb_test("${PROJECT_SOURCE_DIR}/db/version_edit_test.cc")
+    leveldb_test("${PROJECT_SOURCE_DIR}/db/version_set_test.cc")
+    leveldb_test("${PROJECT_SOURCE_DIR}/db/write_batch_test.cc")
+
+    leveldb_test("${PROJECT_SOURCE_DIR}/helpers/memenv/memenv_test.cc")
+
+    leveldb_test("${PROJECT_SOURCE_DIR}/table/filter_block_test.cc")
+    leveldb_test("${PROJECT_SOURCE_DIR}/table/table_test.cc")
+
+    leveldb_test("${PROJECT_SOURCE_DIR}/util/arena_test.cc")
+    leveldb_test("${PROJECT_SOURCE_DIR}/util/bloom_test.cc")
+    leveldb_test("${PROJECT_SOURCE_DIR}/util/cache_test.cc")
+    leveldb_test("${PROJECT_SOURCE_DIR}/util/coding_test.cc")
+    leveldb_test("${PROJECT_SOURCE_DIR}/util/crc32c_test.cc")
+    leveldb_test("${PROJECT_SOURCE_DIR}/util/hash_test.cc")
+
+    # TODO(costan): This test also uses
+    #               "${PROJECT_SOURCE_DIR}/util/env_posix_test_helper.h"
+    leveldb_test("${PROJECT_SOURCE_DIR}/util/env_posix_test.cc")
+  endif(NOT BUILD_SHARED_LIBS)
+endif(LEVELDB_BUILD_TESTS)
+
+if(LEVELDB_BUILD_BENCHMARKS)
+  function(leveldb_benchmark bench_file)
+    get_filename_component(bench_target_name "${bench_file}" NAME_WE)
+
+    add_executable("${bench_target_name}" "")
+    target_sources("${bench_target_name}"
+      PRIVATE
+        "${PROJECT_BINARY_DIR}/${LEVELDB_PORT_CONFIG_DIR}/port_config.h"
+        "${PROJECT_SOURCE_DIR}/util/histogram.cc"
+        "${PROJECT_SOURCE_DIR}/util/histogram.h"
+        "${PROJECT_SOURCE_DIR}/util/testharness.cc"
+        "${PROJECT_SOURCE_DIR}/util/testharness.h"
+        "${PROJECT_SOURCE_DIR}/util/testutil.cc"
+        "${PROJECT_SOURCE_DIR}/util/testutil.h"
+
+        "${bench_file}"
+    )
+    if(BUILD_SHARED_LIBS)
+      # Port functions aren't exposed in the shared library build.
+      target_sources("${bench_target_name}"
+        PRIVATE
+          $<TARGET_OBJECTS:leveldb_port_posix>
+      )
+    endif(BUILD_SHARED_LIBS)
+
+    target_link_libraries("${bench_target_name}" leveldb)
+    target_compile_definitions("${bench_target_name}"
+      PRIVATE
+        LEVELDB_PLATFORM_POSIX=1
+    )
+  endfunction(leveldb_benchmark)
+
+  if(NOT BUILD_SHARED_LIBS)
+    leveldb_benchmark("${PROJECT_SOURCE_DIR}/db/db_bench.cc")
+  endif(NOT BUILD_SHARED_LIBS)
+
+  check_library_exists(sqlite3 sqlite3_open "" HAVE_SQLITE3)
+  if(HAVE_SQLITE3)
+    leveldb_benchmark("${PROJECT_SOURCE_DIR}/doc/bench/db_bench_sqlite3.cc")
+    target_link_libraries(db_bench_sqlite3 sqlite3)
+  endif(HAVE_SQLITE3)
+
+  # check_library_exists is insufficient here because the library names have
+  # different manglings when compiled with clang or gcc, at least when installed
+  # with Homebrew on Mac.
+  set(OLD_CMAKE_REQURED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
+  list(APPEND CMAKE_REQUIRED_LIBRARIES kyotocabinet)
+  check_cxx_source_compiles("
+#include <kcpolydb.h>
+
+int main() {
+  kyotocabinet::TreeDB* db = new kyotocabinet::TreeDB();
+  delete db;
+  return 0;
+}
+  "  HAVE_KYOTOCABINET)
+  set(CMAKE_REQUIRED_LIBRARIES ${OLD_CMAKE_REQURED_LIBRARIES})
+  if(HAVE_KYOTOCABINET)
+    leveldb_benchmark("${PROJECT_SOURCE_DIR}/doc/bench/db_bench_tree_db.cc")
+    target_link_libraries(db_bench_tree_db kyotocabinet)
+  endif(HAVE_KYOTOCABINET)
+endif(LEVELDB_BUILD_BENCHMARKS)
+
+if(LEVELDB_INSTALL)
+  include(GNUInstallDirs)
+  install(TARGETS leveldb
+    EXPORT LeveldbTargets
+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+  )
+  install(
+    FILES
+      "${PROJECT_SOURCE_DIR}/${LEVELDB_PUBLIC_INCLUDE_DIR}/c.h"
+      "${PROJECT_SOURCE_DIR}/${LEVELDB_PUBLIC_INCLUDE_DIR}/cache.h"
+      "${PROJECT_SOURCE_DIR}/${LEVELDB_PUBLIC_INCLUDE_DIR}/comparator.h"
+      "${PROJECT_SOURCE_DIR}/${LEVELDB_PUBLIC_INCLUDE_DIR}/db.h"
+      "${PROJECT_SOURCE_DIR}/${LEVELDB_PUBLIC_INCLUDE_DIR}/dumpfile.h"
+      "${PROJECT_SOURCE_DIR}/${LEVELDB_PUBLIC_INCLUDE_DIR}/env.h"
+      "${PROJECT_SOURCE_DIR}/${LEVELDB_PUBLIC_INCLUDE_DIR}/filter_policy.h"
+      "${PROJECT_SOURCE_DIR}/${LEVELDB_PUBLIC_INCLUDE_DIR}/iterator.h"
+      "${PROJECT_SOURCE_DIR}/${LEVELDB_PUBLIC_INCLUDE_DIR}/options.h"
+      "${PROJECT_SOURCE_DIR}/${LEVELDB_PUBLIC_INCLUDE_DIR}/slice.h"
+      "${PROJECT_SOURCE_DIR}/${LEVELDB_PUBLIC_INCLUDE_DIR}/status.h"
+      "${PROJECT_SOURCE_DIR}/${LEVELDB_PUBLIC_INCLUDE_DIR}/table_builder.h"
+      "${PROJECT_SOURCE_DIR}/${LEVELDB_PUBLIC_INCLUDE_DIR}/table.h"
+      "${PROJECT_SOURCE_DIR}/${LEVELDB_PUBLIC_INCLUDE_DIR}/write_batch.h"
+    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/leveldb
+  )
+
+  include(CMakePackageConfigHelpers)
+  write_basic_package_version_file(
+      "${PROJECT_BINARY_DIR}/LeveldbConfigVersion.cmake"
+      COMPATIBILITY SameMajorVersion
+  )
+  install(
+    EXPORT LeveldbTargets
+    NAMESPACE Leveldb::
+    DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/Leveldb"
+  )
+  install(
+    FILES
+      "${PROJECT_SOURCE_DIR}/cmake/LeveldbConfig.cmake"
+      "${PROJECT_BINARY_DIR}/LeveldbConfigVersion.cmake"
+    DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/Leveldb"
+  )
+endif(LEVELDB_INSTALL)
diff --git a/cmake/LeveldbConfig.cmake b/cmake/LeveldbConfig.cmake
new file mode 100644
index 0000000..8f3e78b
--- /dev/null
+++ b/cmake/LeveldbConfig.cmake
@@ -0,0 +1 @@
+include("${CMAKE_CURRENT_LIST_DIR}/LeveldbTargets.cmake")
diff --git a/db/dumpfile.cc b/db/dumpfile.cc
index 61c47c2..2f1b5d9 100644
--- a/db/dumpfile.cc
+++ b/db/dumpfile.cc
@@ -2,7 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file. See the AUTHORS file for names of contributors.
 
+#include "leveldb/dumpfile.h"
+
 #include <stdio.h>
+
 #include "db/dbformat.h"
 #include "db/filename.h"
 #include "db/log_reader.h"
diff --git a/helpers/memenv/memenv.h b/helpers/memenv/memenv.h
index 03b88de..3d929e4 100644
--- a/helpers/memenv/memenv.h
+++ b/helpers/memenv/memenv.h
@@ -5,6 +5,8 @@
 #ifndef STORAGE_LEVELDB_HELPERS_MEMENV_MEMENV_H_
 #define STORAGE_LEVELDB_HELPERS_MEMENV_MEMENV_H_
 
+#include "leveldb/export.h"
+
 namespace leveldb {
 
 class Env;
@@ -13,7 +15,7 @@ class Env;
 // all non-file-storage tasks to base_env. The caller must delete the result
 // when it is no longer needed.
 // *base_env must remain live while the result is in use.
-Env* NewMemEnv(Env* base_env);
+LEVELDB_EXPORT Env* NewMemEnv(Env* base_env);
 
 }  // namespace leveldb
 
diff --git a/include/leveldb/export.h b/include/leveldb/export.h
index 39b2097..6ba9b18 100644
--- a/include/leveldb/export.h
+++ b/include/leveldb/export.h
@@ -8,7 +8,7 @@
 #if !defined(LEVELDB_EXPORT)
 
 #if defined(LEVELDB_SHARED_LIBRARY)
-#if defined(OS_WIN)
+#if defined(_WIN32)
 
 #if defined(LEVELDB_COMPILE_LIBRARY)
 #define LEVELDB_EXPORT __declspec(dllexport)
@@ -16,13 +16,13 @@
 #define LEVELDB_EXPORT __declspec(dllimport)
 #endif  // defined(LEVELDB_COMPILE_LIBRARY)
 
-#else  // defined(OS_WIN)
+#else  // defined(_WIN32)
 #if defined(LEVELDB_COMPILE_LIBRARY)
 #define LEVELDB_EXPORT __attribute__((visibility("default")))
 #else
 #define LEVELDB_EXPORT
 #endif
-#endif  // defined(OS_WIN)
+#endif  // defined(_WIN32)
 
 #else  // defined(LEVELDB_SHARED_LIBRARY)
 #define LEVELDB_EXPORT
diff --git a/port/port_config.h.in b/port/port_config.h.in
new file mode 100644
index 0000000..549f179
--- /dev/null
+++ b/port/port_config.h.in
@@ -0,0 +1,36 @@
+// Copyright 2017 The LevelDB Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file. See the AUTHORS file for names of contributors.
+
+#ifndef STORAGE_LEVELDB_PORT_PORT_CONFIG_H_
+#define STORAGE_LEVELDB_PORT_PORT_CONFIG_H_
+
+// Define to 1 if you have a definition for fdatasync() in <unistd.h>.
+#if !defined(HAVE_FUNC_FDATASYNC)
+#cmakedefine01 HAVE_FUNC_FDATASYNC
+#endif  // !defined(HAVE_FUNC_FDATASYNC)
+
+// Define to 1 if you have Google CRC32C.
+#if !defined(HAVE_CRC32C)
+#cmakedefine01 HAVE_CRC32C
+#endif  // !defined(HAVE_CRC32C)
+
+// Define to 1 if you have Google Snappy.
+#if !defined(HAVE_SNAPPY)
+#cmakedefine01 HAVE_SNAPPY
+#endif  // !defined(HAVE_SNAPPY)
+
+// Define to 1 if your processor stores words with the most significant byte
+// first (like Motorola and SPARC, unlike Intel and VAX).
+#if !defined(LEVELDB_IS_BIG_ENDIAN)
+#cmakedefine01 LEVELDB_IS_BIG_ENDIAN
+#endif  // !defined(LEVELDB_IS_BIG_ENDIAN)
+
+// Define to 1 if you have the <atomic> header.
+// NOTE: <atomic> was standardized in C++11, which will be required to build
+// LevelDB soon.
+#if !defined(LEVELDB_ATOMIC_PRESENT)
+#cmakedefine01 LEVELDB_ATOMIC_PRESENT
+#endif  // !defined(LEVELDB_ATOMIC_PRESENT)
+
+#endif  // STORAGE_LEVELDB_PORT_PORT_CONFIG_H_
\ No newline at end of file
diff --git a/port/port_posix.h b/port/port_posix.h
index ce52042..2fb2269 100644
--- a/port/port_posix.h
+++ b/port/port_posix.h
@@ -7,36 +7,22 @@
 #ifndef STORAGE_LEVELDB_PORT_PORT_POSIX_H_
 #define STORAGE_LEVELDB_PORT_PORT_POSIX_H_
 
-#undef PLATFORM_IS_LITTLE_ENDIAN
-#if defined(__APPLE__)
-  #include <machine/endian.h>
-  #if defined(__DARWIN_LITTLE_ENDIAN) && defined(__DARWIN_BYTE_ORDER)
-    #define PLATFORM_IS_LITTLE_ENDIAN \
-        (__DARWIN_BYTE_ORDER == __DARWIN_LITTLE_ENDIAN)
-  #endif
-#elif defined(OS_SOLARIS)
-  #include <sys/isa_defs.h>
-  #ifdef _LITTLE_ENDIAN
-    #define PLATFORM_IS_LITTLE_ENDIAN true
-  #else
-    #define PLATFORM_IS_LITTLE_ENDIAN false
-  #endif
-#elif defined(OS_FREEBSD) || defined(OS_OPENBSD) ||\
-      defined(OS_NETBSD) || defined(OS_DRAGONFLYBSD)
-  #include <sys/types.h>
-  #include <sys/endian.h>
-  #define PLATFORM_IS_LITTLE_ENDIAN (_BYTE_ORDER == _LITTLE_ENDIAN)
-#elif defined(OS_HPUX)
-  #define PLATFORM_IS_LITTLE_ENDIAN false
-#elif defined(OS_ANDROID)
-  // Due to a bug in the NDK x86 <sys/endian.h> definition,
-  // _BYTE_ORDER must be used instead of __BYTE_ORDER on Android.
-  // See http://code.google.com/p/android/issues/detail?id=39824
-  #include <endian.h>
-  #define PLATFORM_IS_LITTLE_ENDIAN  (_BYTE_ORDER == _LITTLE_ENDIAN)
-#else
-  #include <endian.h>
-#endif
+// port/port_config.h availability is automatically detected via __has_include
+// in newer compilers. If LEVELDB_HAS_PORT_CONFIG_H is defined, it overrides the
+// configuration detection.
+#if defined(LEVELDB_HAS_PORT_CONFIG_H)
+
+#if LEVELDB_HAS_PORT_CONFIG_H
+#include "port/port_config.h"
+#endif  // LEVELDB_HAS_PORT_CONFIG_H
+
+#elif defined(__has_include)
+
+#if __has_include("port/port_config.h")
+#include "port/port_config.h"
+#endif  // __has_include("port/port_config.h")
+
+#endif  // defined(LEVELDB_HAS_PORT_CONFIG_H)
 
 #include <pthread.h>
 #if HAVE_CRC32C
@@ -54,23 +40,14 @@
 #define PLATFORM_IS_LITTLE_ENDIAN (__BYTE_ORDER == __LITTLE_ENDIAN)
 #endif
 
-#if defined(__APPLE__) || defined(OS_FREEBSD) ||\
-    defined(OS_OPENBSD) || defined(OS_DRAGONFLYBSD)
-// Use fsync() on platforms without fdatasync()
+#if !HAVE_FDATASYNC
 #define fdatasync fsync
-#endif
-
-#if defined(OS_ANDROID) && __ANDROID_API__ < 9
-// fdatasync() was only introduced in API level 9 on Android. Use fsync()
-// when targetting older platforms.
-#define fdatasync fsync
-#endif
+#endif  // !HAVE_FDATASYNC
 
 namespace leveldb {
 namespace port {
 
-static const bool kLittleEndian = PLATFORM_IS_LITTLE_ENDIAN;
-#undef PLATFORM_IS_LITTLE_ENDIAN
+static const bool kLittleEndian = !LEVELDB_IS_BIG_ENDIAN;
 
 class CondVar;