Interesting, GCC has '-fstack-usage' to output the stack usage of each function into .su files, I didn't realise LLVM was lacking this feature.

There is a tool in rust[1] I just found that makes LLVM emit this information for rust code, but it stores it within[2] the .stack_sizes section in the emitted .elf instead. Possibly a similar trick could be added to Zig

[1] https://github.com/japaric/stack-sizes [2] https://llvm.org/docs/CodeGenerator.html#emitting-function-s...