What language do they build other languages with?

Question

What language is used to build low level languages like c++ and java?

How could you build the first language with no language?

Answer 1

Much of this kind of thing is done in C.

The first C compiler was not written in C; it was PDP-11 assembler. Other early C compilers have been written in various assembler languages.

But all subsequent C compilers actually are written in C, based on an early "Portable C Compiler". Yes, it's circular. But the version x compiler can be used to build the version x+1 compiler.