void bit_fill_hex(const char* str) failing when using clang compiler

[YenZi]

When trying to compile my code on macOS, using clang compiler, I get the following error :

ac_types-stable/include/ac_int.h:2501:11: error: no viable overloaded '|='
      res |= h;
      ~~~ ^  ~
ac_types-stable/include/ac_int.h:2205:11: note: candidate template ignored: could not match 'ac_int<W, S>' against 'int'
  ac_int &operator |= ( const ac_int<W2,S2> &op2 ) {
          ^
ac_types-stable/include/ac_int.h:2500:11: error: no viable overloaded '<<='
      res <<= 4;
      ~~~ ^   ~
ac_types-stable/include/ac_fixed.h:971:7: note: in instantiation of member function 'ac_int<29, false>::bit_fill_hex' requested here
    x.bit_fill_hex(str);
      ^
utils/cpp/src/MyUtils.cpp:220:7: note: in instantiation of member function 'ac_fixed<29, 29, false, AC_TRN, AC_SAT>::bit_fill_hex' requested here
    a.bit_fill_hex(ss.str().c_str());
      ^
ac_types-stable/include/ac_int.h:2251:11: note: candidate template ignored: could not match 'ac_int<W2, true>' against 'int'
  ac_int &operator <<= ( const ac_int<W2,true> &op2 ) {
          ^
ac_types-stable/include/ac_int.h:2259:11: note: candidate template ignored: could not match 'ac_int<W, false>' against 'int'
  ac_int &operator <<= ( const ac_int<W2,false> &op2 ) {
          ^

A possible fix would be this :

in ac_int.h lines 2500, 2501 change from :

res <<= 4;¬
res |= h;¬

to

res <<= ac_int<W,S>(4);
res |= ac_int<W,S>(h);

Please review. Thanks.