fix couple warnings, use stable version ofg googletest

cmake/CMakeLists.txt.in

@@ -5,7 +5,7 @@ project(googletest-download NONE)
 include(ExternalProject)
 ExternalProject_Add(googletest
   GIT_REPOSITORY    https://github.com/google/googletest.git
-  GIT_TAG           master
+  GIT_TAG           release-1.8.1
   SOURCE_DIR        "${CMAKE_BINARY_DIR}/googletest-src"
   BINARY_DIR        "${CMAKE_BINARY_DIR}/googletest-build"
   CONFIGURE_COMMAND ""

examples/insert_bench.cc

@@ -20,11 +20,11 @@ public:
     sfc64(sfc64&&) = default;
     sfc64& operator=(sfc64&&) = default;
 
-    sfc64(std::array<uint64_t, 4> const& state)
-        : m_a(state[0])
-        , m_b(state[1])
-        , m_c(state[2])
-        , m_counter(state[3]) {}
+    sfc64(std::array<uint64_t, 4> const& _state)
+        : m_a(_state[0])
+        , m_b(_state[1])
+        , m_c(_state[2])
+        , m_counter(_state[3]) {}
 
     static constexpr uint64_t(min)() {
         return (std::numeric_limits<uint64_t>::min)();
@@ -36,10 +36,10 @@ public:
     sfc64()
         : sfc64(UINT64_C(0x853c49e6748fea9b)) {}
 
-    sfc64(uint64_t seed)
-        : m_a(seed)
-        , m_b(seed)
-        , m_c(seed)
+    sfc64(uint64_t _seed)
+        : m_a(_seed)
+        , m_b(_seed)
+        , m_c(_seed)
         , m_counter(1) {
         for (int i = 0; i < 12; ++i) {
             operator()();

parallel_hashmap/phmap.h

@@ -3184,8 +3184,8 @@ public:
     }
 
     float load_factor() const {
-        size_t capacity = bucket_count();
-        return capacity ? static_cast<float>(static_cast<double>(size()) / capacity) : 0;
+        size_t _capacity = bucket_count();
+        return _capacity ? static_cast<float>(static_cast<double>(size()) / _capacity) : 0;
     }
 
     float max_load_factor() const { return 1.0f; }