[enriquto]

Do you know if there's language support for that? Are there obscure gcc options that make "long double" be quadruple precision floats?

[zokier]

You can just use standard C _Float128 type https://gcc.gnu.org/onlinedocs/gcc/Floating-Types.html

[cogman10]

Which language?

For C++, there's this: https://en.cppreference.com/w/cpp/types/floating-point