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Unspecified behavior and implementation defined behavior are distinct in theory. The latter requires the behavior to be documented by the implementer, while the

Unspecified behavior and implementation defined behavior are distinct in theory. The latter requires the behavior to be documented by the implementer, while the former does not. In practice I dare you to find compiler documentation for each implementation defined behavior. https://timsong-cpp.github.io/cppwp/n4868/intro.defs#defns.unspecified https://timsong-cpp.github.io/cppwp/n4868/intro.defs#defns.u... https://timsong-cpp.github.io/cppwp/n4868/intro.defs#defns.impl.defined https://timsong-cpp.github.io/cppwp/n4868/intro.defs#defns.i... edit: C wording: https://cigix.me/c17#J.1 https://cigix.me/c17#J.1 https://cigix.me/c17#J.3 https://cigix.me/c17#J.3

gpderetta 4y ago
> In practice I dare you to find compiler documentation for each implementation defined behavior. For gcc there is this: https://gcc.gnu.org/onlinedocs/gcc/C-Implementation.html https://gcc.gnu.org/onlinedocs/gcc/C-Implementation.html No idea how complete it is. Also a lot of stuff is architecture/platform specific, not compiler specific, so you won't find it in the general compiler docs but you have to look at the psABI.