Reddit reviews Introduction to Compiling Techniques: A First Course Using ANSI C, Lex, and Yacc (The McGraw-Hill International Series in Software Engineering)

I have "Introduction to compiling techniques," J. P. Bennett which I needed for my undergraduate first year course intro to compilers. It's riddled with errors, luckily for me, the previous owner decided to correct a lot of them :)

I've decided to go through it again as I have a few projects I want to look into and I'd not touched compilers in years. I thought I'd start with this one as I had it and I've never implemented the compiler within.

This is quite good as it's not dense, and can be read cover to cover, unlike a lot of books, cough Dragon cough. It uses Lex (Flex) and Yacc (Bison) and K&R (yup, it's that old) C. I'm working through it and will be implementing the compiler and virtual machine with Ada 2012 and our aging aflex/ayacc tools, sigh, so you can use any language and whatever tools you have available to you.

From that link, the second one down from World books for £4.33 total, that's not bad, tbh for an intro, this'll easily get you started so you can move onto something more advanced. I've also got Appel's C book from years ago, so will move onto that next.