Fix compile issue in Mac OS

Summary:
Compile issues are:
* Unused variable env_
* Unused fallocate_with_keep_size_

Test Plan: compiles

Reviewers: dhruba, haobo, sdong

Reviewed By: dhruba

CC: leveldb

Differential Revision: https://reviews.facebook.net/D17043

db/db_test.cc

@@ -2057,8 +2057,7 @@ TEST(DBTest, NumImmutableMemTable) {
 
 class SleepingBackgroundTask {
  public:
-  explicit SleepingBackgroundTask(Env* env)
-      : env_(env), bg_cv_(&mutex_), should_sleep_(true) {}
+  SleepingBackgroundTask() : bg_cv_(&mutex_), should_sleep_(true) {}
   void DoSleep() {
     MutexLock l(&mutex_);
     while (should_sleep_) {
@@ -2076,7 +2075,6 @@ class SleepingBackgroundTask {
   }
 
  private:
-  const Env* env_;
   port::Mutex mutex_;
   port::CondVar bg_cv_;  // Signalled when background work finishes
   bool should_sleep_;
@@ -2086,10 +2084,10 @@ TEST(DBTest, GetProperty) {
   // Set sizes to both background thread pool to be 1 and block them.
   env_->SetBackgroundThreads(1, Env::HIGH);
   env_->SetBackgroundThreads(1, Env::LOW);
-  SleepingBackgroundTask sleeping_task_low(env_);
+  SleepingBackgroundTask sleeping_task_low;
   env_->Schedule(&SleepingBackgroundTask::DoSleepTask, &sleeping_task_low,
                  Env::Priority::LOW);
-  SleepingBackgroundTask sleeping_task_high(env_);
+  SleepingBackgroundTask sleeping_task_high;
   env_->Schedule(&SleepingBackgroundTask::DoSleepTask, &sleeping_task_high,
                  Env::Priority::HIGH);
 

util/env_posix.cc

@@ -356,7 +356,9 @@ class PosixMmapFile : public WritableFile {
   uint64_t file_offset_;  // Offset of base_ in file
   // Have we done an munmap of unsynced data?
   bool pending_sync_;
+#ifdef ROCKSDB_FALLOCATE_PRESENT
   bool fallocate_with_keep_size_;
+#endif
 
   // Roundup x to a multiple of y
   static size_t Roundup(size_t x, size_t y) {
@@ -441,8 +443,10 @@ class PosixMmapFile : public WritableFile {
         dst_(nullptr),
         last_sync_(nullptr),
         file_offset_(0),
-        pending_sync_(false),
-        fallocate_with_keep_size_(options.fallocate_with_keep_size) {
+        pending_sync_(false) {
+#ifdef ROCKSDB_FALLOCATE_PRESENT
+    fallocate_with_keep_size_ = options.fallocate_with_keep_size;
+#endif
     assert((page_size & (page_size - 1)) == 0);
     assert(options.use_mmap_writes);
   }
@@ -614,7 +618,9 @@ class PosixWritableFile : public WritableFile {
   bool pending_fsync_;
   uint64_t last_sync_size_;
   uint64_t bytes_per_sync_;
+#ifdef ROCKSDB_FALLOCATE_PRESENT
   bool fallocate_with_keep_size_;
+#endif
 
  public:
   PosixWritableFile(const std::string& fname, int fd, size_t capacity,
@@ -628,8 +634,10 @@ class PosixWritableFile : public WritableFile {
         pending_sync_(false),
         pending_fsync_(false),
         last_sync_size_(0),
-        bytes_per_sync_(options.bytes_per_sync),
-        fallocate_with_keep_size_(options.fallocate_with_keep_size) {
+        bytes_per_sync_(options.bytes_per_sync) {
+#ifdef ROCKSDB_FALLOCATE_PRESENT
+    fallocate_with_keep_size_ = options.fallocate_with_keep_size;
+#endif
     assert(!options.use_mmap_writes);
   }
 
@@ -809,15 +817,19 @@ class PosixRandomRWFile : public RandomRWFile {
   int fd_;
   bool pending_sync_;
   bool pending_fsync_;
+#ifdef ROCKSDB_FALLOCATE_PRESENT
   bool fallocate_with_keep_size_;
+#endif
 
  public:
   PosixRandomRWFile(const std::string& fname, int fd, const EnvOptions& options)
       : filename_(fname),
         fd_(fd),
         pending_sync_(false),
-        pending_fsync_(false),
-        fallocate_with_keep_size_(options.fallocate_with_keep_size) {
+        pending_fsync_(false) {
+#ifdef ROCKSDB_FALLOCATE_PRESENT
+    fallocate_with_keep_size_ = options.fallocate_with_keep_size;
+#endif
     assert(!options.use_mmap_writes && !options.use_mmap_reads);
   }