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The point of "implementation defined" is that the actual code generated is up to implementation, or in fact whether it even accepts such code.
by p_l 2y ago
The point of "implementation defined" is that the actual code generated is up to implementation, or in fact whether it even accepts such code.
- rfoo 2y agoSure, I don't disagree. What I mean is, most compilers won't generate a function call or an additional indirect memory access for *(111) = 222;, unlike your spec-compliant alternatives. This is, IMO, the problem. Sometimes we just want a more ergonomic way than inline assembly in a hot loop (and also we'd like to to pretend its portable). The spec does not have an answer to this. So, unless all C compilers in the world actively sabotage this usage (like how Go did to map traversal orders), your spec saying this is "implementation defined" have no impact at all. All C compilers are bound to implement the same intuitive but completely-not-enforced-by-spec behavior. Because if they don't, people just use something else.