1. Is what gets in my way the most when writing C. The whole undefined behaviour story is a wreck. Not hugely relevant but zero initialised globals don't imply

1. Is what gets in my way the most when writing C. The whole undefined behaviour story is a wreck. Not hugely relevant but zero initialised globals don't imply code inserted before main. They get allocated at link time into a continuous blob which is zeroed by the loader. Non-zero values take up space in the binary but also involve no code generation. Global constructors, C++ style, usually do involve walking an array of function pointers before main though.