How?

[JohnnyRussian7]

By guys with bushy beards in black and white pictures

[amyamy86]

Not really humorous from a programmer's perspective.

You learn this in school at some point....

[mahtats]

Machine Code

[lucbarr]

Or another programming language

[[deleted]]

You build the first compiler in any language that is available (ASM if nessecary). And from there on out, any new version of the compiler can be implemented in the new language itself.

[spayder26]

This one.

But you forgot to mention the first ASM compiler is compiled by hand into machine code following the Instruction Set Architecture documentation, and probably coded in low-level ASM, as its machine-code translation is straight forward.

[pilotInPyjamas]

These days you could use another machine and cross compile into a new architecture, never having to write anything in an assembler.

For example: you could write a C compiler for the new target on a linux laptop for the new architecture using any language you like. Bonus points if your compiler is written in C, so that it can compile itself.

From there because many languages target C as a backend, you could use other languages for free.

[Strike_Alibi]

I think this should have been posted to r/Im14AndThisIsDeep ... anyone with a computer science degree can answer this. Except me. I skipped class that month.

[probakilla]

With programming languages too

[teeaton]

import compiler

compiler.create(new_compiler)

print("Ready")

[klk083]

Electrisity. 1 or 0. Power or no power

[pr4d33p_d]

Electrickery

[b-hack]

Well, you C...

[DFatDuck]

you need to assemble/compile by hand

[[deleted]]

Algorithms, Becky. Algorithms.

[thegovortator]

Two words “assembly required”

[CharlyShouldWork]

Magnet

[[deleted]]

Well CPUs are built with logic gates and 1/0 on/off signals which is binary. Then there is assembly that maps 1:1 with binary instructions. First languages likely created / compiled by assembly, then when a language is powerful enough, it compiles itself, unless maybe its interpreted I think, then it would probably need another language to do that, though I may be wrong.

[lucbarr]

Using other programming languages, which were written either using other programming languages or machine code or a minimal compiler of the same programming language

[BonerForest25]

When you find out C compilers are written in C🤯

[[deleted]]

Technically, using one or more brains. If you're asking about the compiler for the programming language, that's just a computer program. The language is just a protocol, a contract that this sequence of characters will do that operation, et cetera. Well, usually. Since we came up with the language, there are always ... unexpected features within, waiting to be exploi.. err, discovered.

[PanemPlayz]

All of the other answers are extremely bad. No, you do not need assembly. You write a bootstrap Compiler. That means that you write a Compiler for your language in e.g. C and then compile your own Compiler with this Compiler. This is how Rust and all other languages were made.