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<utility>: make unreachable() call the doom function in debug mode#6159
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StephanTLavavej
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<utility>: attempt to call doom function on unreachable() call in a debug configuration<utility>: make unreachable() call the doom function in debug mode
StephanTLavavej
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Mar 31, 2026
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Fix #6151.
In debug mode,
unreachable()will deterministically call the doom function. In release mode, users get the UB they asked for.Extract doom function to a new core header to achieve that. As @frederick-vs-ja suggested, core headers do call some functions. In this case, a function will be called by default for
/clrconfigurations only.Extended test coverage to make sure the machinery does not break compilation.
No runtime coverage -- it is still UB to call
unreachable()according to the Standard.