I would completely agree. From memory (because I left my copy of the Dragon book in another country) the book describes very well the first stages of compiler

I would completely agree. From memory (because I left my copy of the Dragon book in another country) the book describes very well the first stages of compiler construction, describing the fundamentals of what Lex/Flex and Yacc/Bison do. Right now for a compiler I'm writing I have used the Crafting Interpreters book and find it very useful. It's basic but can carry you through a project, and a decent reference for someone who took a Compiler Construction course about 20 years ago.