message: Disabled constexpr for hashing functions.
  This was incompatible with -Wc++98-c++11-compat on some platforms,
  due to local variables in the function.
diff: @@ -39,7 +39,7 @@ template<> struct FnvTraits<uint64_t> {
  static const uint64_t kOffsetBasis = 0xcbf29ce484222645ULL;
  };
  -template<typename T> FLATBUFFERS_CONSTEXPR_CPP14 T HashFnv1(const char *input) {
  +template<typename T> T HashFnv1(const char *input) {
  T hash = FnvTraits<T>::kOffsetBasis;
  for (const char *c = input; *c; ++c) {
  hash *= FnvTraits<T>::kFnvPrime;
  @@ -48,7 +48,7 @@ template<typename T> FLATBUFFERS_CONSTEXPR_CPP14 T HashFnv1(const char *input) {
  return hash;
  }
  -template<typename T> FLATBUFFERS_CONSTEXPR_CPP14 T HashFnv1a(const char *input) {
  +template<typename T> T HashFnv1a(const char *input) {
  T hash = FnvTraits<T>::kOffsetBasis;
  for (const char *c = input; *c; ++c) {
  hash ^= static_cast<unsigned char>(*c);
  @@ -57,12 +57,12 @@ template<typename T> FLATBUFFERS_CONSTEXPR_CPP14 T HashFnv1a(const char *input)
  return hash;
  }
  -template <> FLATBUFFERS_CONSTEXPR_CPP14 inline uint16_t HashFnv1<uint16_t>(const char *input) {
  +template <> inline uint16_t HashFnv1<uint16_t>(const char *input) {
  uint32_t hash = HashFnv1<uint32_t>(input);
  return (hash >> 16) ^ (hash & 0xffff);
  }
  -template <> FLATBUFFERS_CONSTEXPR_CPP14 inline uint16_t HashFnv1a<uint16_t>(const char *input) {
  +template <> inline uint16_t HashFnv1a<uint16_t>(const char *input) {
  uint32_t hash = HashFnv1a<uint32_t>(input);
  return (hash >> 16) ^ (hash & 0xffff);
  }
  