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On 09 Jan 2015 10:16, Richard Henderson wrote: > Finally, use __builtin_unreachable to tell the compiler about > impossible paths. i'm not sure this is the way to go. the expectation (as required by POSIX) is that you're guaranteed there are no side-effects when NDEBUG is applied to assert. by using __builtin_unreachable, that is no longer the case. yes, assert in this context is internal to glibc and so doesn't have to conform to POSIX directly. but i think forcing developers to remember this kind of nuance just leads to bugs, especially when you consider glibc imports code from other projects (like gnulib). the code shrinkage is attractive, but the other factors considered (and that NDEBUG usage in glibc in general is uncommon) leads me to think this path is not worth the pain. -mike
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