Z88DK is a multiplatform C Cross-Compiler.
Z88DK is actively developed and supports the Coupé in 'classic' mode as a target (+sam) with support for both ANSI and native text, graphics drawing, beeper and E-tracker music.
Z88DK is part of the toolchain for Cross Lib plus some examples are at https://github.com/dandoore/danscstuff
From the project:
Z88DK is a complete development toolkit for the 8080, gbz80, z80, z180, z80n and Rabbit processors.
It contains two C compilers, an assembler / linker / librarian, data compression tools and a utility for processing the raw binaries into forms needed by specific targets.
It comes with an extensive library of functions written in assembly language that implements the C standard and many extensions. It holds the largest repository of z80 code on the internet.
Development in assembly language or C is completely integrated; projects can be 100% assembler, 100% C or any mixture of the two. The toolset treats both as first-class languages and is designed to make it very easy to mix them at will with C and asm functions being able to call each other or make use of the hand-optimized library functions.
The toolset is modern and has modern features. Most z80 assembly tools are simple in that they assume a small memory space (confined to 64k) or lack linking capability. Z88DK is able to generate ROMable code and code for multiple memory banks (bank assignment still requires human direction) and the linking capability means large bodies of code or data can be shared in libraries between projects with the linker only drawing out code and data that is actually used by a linking program.