Fix some compilation bugs in different platforms

Summary:

detect some problems when testing my 3rd party release tool.

Makefile

@@ -12,6 +12,10 @@ OPT += -O2 -fno-omit-frame-pointer -momit-leaf-frame-pointer
 else
 OPT += -fno-omit-frame-pointer -momit-leaf-frame-pointer
 endif
+
+ifeq ($(MAKECMDGOALS),shared_lib)
+PLATFORM_SHARED_LDFLAGS=-fPIC
+endif
 #-----------------------------------------------
 
 # detect what platform we're building on
@@ -135,7 +139,7 @@ $(SHARED2): $(SHARED3)
 	ln -fs $(SHARED3) $(SHARED2)
 endif
 
-$(SHARED3): $(LIBOBJECTS)
+$(SHARED3):
 	$(CXX) $(PLATFORM_SHARED_LDFLAGS)$(SHARED2) $(CXXFLAGS) $(PLATFORM_SHARED_CFLAGS) $(LDFLAGS) $(SOURCES) -o $@
 
 endif  # PLATFORM_SHARED_EXT

util/auto_roll_logger_test.cc

@@ -245,7 +245,7 @@ TEST(AutoRollLoggerTest, InfoLogLevel) {
   InitTestDb();
 
   size_t log_size = 8192;
-  int log_lines = 0;
+  size_t log_lines = 0;
   // an extra-scope to force the AutoRollLogger to flush the log file when it
   // becomes out of scope.
   {
@@ -275,7 +275,7 @@ TEST(AutoRollLoggerTest, InfoLogLevel) {
     }
   }
   std::ifstream inFile(AutoRollLoggerTest::kLogFile.c_str());
-  int lines = std::count(std::istreambuf_iterator<char>(inFile),
+  size_t lines = std::count(std::istreambuf_iterator<char>(inFile),
                          std::istreambuf_iterator<char>(), '\n');
   ASSERT_EQ(log_lines, lines);
   inFile.close();

util/thread_local_test.cc

@@ -103,7 +103,7 @@ TEST(ThreadLocalTest, UniqueIdTest) {
 
 TEST(ThreadLocalTest, SequentialReadWriteTest) {
   // global id list carries over 3, 1, 2, 0
-  ASSERT_EQ(IDChecker::PeekId(), 0);
+  ASSERT_EQ(IDChecker::PeekId(), 0u);
 
   port::Mutex mu;
   port::CondVar cv(&mu);
@@ -133,7 +133,7 @@ TEST(ThreadLocalTest, SequentialReadWriteTest) {
   };
 
   for (int iter = 0; iter < 1024; ++iter) {
-    ASSERT_EQ(IDChecker::PeekId(), 1);
+    ASSERT_EQ(IDChecker::PeekId(), 1u);
     // Another new thread, read/write should not see value from previous thread
     env_->StartThread(func, static_cast<void*>(&p));
     mu.Lock();
@@ -141,13 +141,13 @@ TEST(ThreadLocalTest, SequentialReadWriteTest) {
       cv.Wait();
     }
     mu.Unlock();
-    ASSERT_EQ(IDChecker::PeekId(), 1);
+    ASSERT_EQ(IDChecker::PeekId(), 1u);
   }
 }
 
 TEST(ThreadLocalTest, ConcurrentReadWriteTest) {
   // global id list carries over 3, 1, 2, 0
-  ASSERT_EQ(IDChecker::PeekId(), 0);
+  ASSERT_EQ(IDChecker::PeekId(), 0u);
 
   ThreadLocalPtr tls2;
   port::Mutex mu1;
@@ -226,11 +226,11 @@ TEST(ThreadLocalTest, ConcurrentReadWriteTest) {
   }
   mu2.Unlock();
 
-  ASSERT_EQ(IDChecker::PeekId(), 3);
+  ASSERT_EQ(IDChecker::PeekId(), 3u);
 }
 
 TEST(ThreadLocalTest, Unref) {
-  ASSERT_EQ(IDChecker::PeekId(), 0);
+  ASSERT_EQ(IDChecker::PeekId(), 0u);
 
   auto unref = [](void* ptr) {
     auto& p = *static_cast<Params*>(ptr);