M4 macro language resources

My work on Suite8080 is making me rediscover the Unix M4 macro processing language.

Suite8080, a suite of Intel 8080 Assembly cross-development tools I'm writing in Python, includes also an assembler. I designed the latter to optionally read from the standard input, a feature that gives for free macro processing via a separate tool like m4. I can feed macro Assembly source to m4 and pipe the expanded output into the assembler.

The M4 language is a good choice thanks to its power and ubiquity on POSIX systems.

However, m4 is an obscure tool with a learning curve made steep by the unintuitive quoting and expansion rules. There are few resources and no books or tutorials. The very few code samples are abstract, short, and formatted with little or no whitespace and indentation, which doesn't help readability.

After extensive online research, I put together a list of the best learning and reference resources:

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