https://bugs.gentoo.org/963586
https://gcc.gnu.org/PR122171
--- a/folly/Fingerprint.cpp
+++ b/folly/Fingerprint.cpp
@@ -86,7 +86,7 @@ constexpr auto copy_table(D const (&table)[S0][S1][S2]) {
 }
 
 template <size_t Deg>
-constexpr poly_table<Deg> make_poly_table() {
+constexpr std::array<std::array<std::array<uint64_t, poly_size(Deg)>, 256>, 8> make_poly_table() {
   FingerprintPolynomial<Deg> poly(FingerprintTablePoly<Deg>::data);
   uint64_t table[8][256][poly_size(Deg)] = {};
   // table[i][q] is Q(X) * X^(k+8*i) mod P(X),
@@ -125,11 +125,11 @@ const uint64_t FingerprintTable<128>::poly[poly_size(128)] = {
     FingerprintTablePoly<127>::data[0], FingerprintTablePoly<127>::data[1]};
 
 template <>
-const poly_table<64> FingerprintTable<64>::table = poly_table_63;
+const std::array<std::array<std::array<uint64_t, poly_size(64)>, 256>, 8> FingerprintTable<64>::table = poly_table_63;
 template <>
-const poly_table<96> FingerprintTable<96>::table = poly_table_95;
+const std::array<std::array<std::array<uint64_t, poly_size(96)>, 256>, 8> FingerprintTable<96>::table = poly_table_95;
 template <>
-const poly_table<128> FingerprintTable<128>::table = poly_table_127;
+const std::array<std::array<std::array<uint64_t, poly_size(128)>, 256>, 8> FingerprintTable<128>::table = poly_table_127;
 
 } // namespace detail
 } // namespace folly
--- a/folly/Fingerprint.h
+++ b/folly/Fingerprint.h
@@ -54,20 +54,16 @@ constexpr size_t poly_size(size_t bits) {
   return 1 + (bits - 1) / 64;
 }
 
-template <size_t Deg>
-using poly_table =
-    std::array<std::array<std::array<uint64_t, poly_size(Deg)>, 256>, 8>;
-
 template <int BITS>
 struct FingerprintTable {
   static const uint64_t poly[poly_size(BITS)];
-  static const poly_table<BITS> table;
+  static const std::array<std::array<std::array<uint64_t, poly_size(BITS)>, 256>, 8> table;
 };
 
 template <int BITS>
 const uint64_t FingerprintTable<BITS>::poly[poly_size(BITS)] = {};
 template <int BITS>
-const poly_table<BITS> FingerprintTable<BITS>::table = {};
+const std::array<std::array<std::array<uint64_t, poly_size(BITS)>, 256>, 8> FingerprintTable<BITS>::table = {};
 
 #ifndef _MSC_VER
 // MSVC as of 2017 can't handle these extern specialization declarations,
@@ -78,7 +74,7 @@ const poly_table<BITS> FingerprintTable<BITS>::table = {};
   template <>                                                   \
   const uint64_t FingerprintTable<BITS>::poly[poly_size(BITS)]; \
   template <>                                                   \
-  const poly_table<BITS> FingerprintTable<BITS>::table
+  const std::array<std::array<std::array<uint64_t, poly_size(BITS)>, 256>, 8> FingerprintTable<BITS>::table
 
 FOLLY_DECLARE_FINGERPRINT_TABLES(64);
 FOLLY_DECLARE_FINGERPRINT_TABLES(96);