C++26 eliminates undefined behavior for trivial infinite loops like `while(true);`, which previously allowed compilers like Clang to optimize away the loop entirely and execute unreachable code afterward. The fix comes from proposal P2809R3, accepted as a defect report so implementations may backport it to earlier C++ standards.
Background
C++ has a long history of subtleties around undefined behavior, particularly in the context of the forward progress guarantee introduced in C++11 for multithreading. This guarantee was sometimes interpreted aggressively by compiler optimizer passes.
- Source
- Lobsters
- Published
- Sep 17, 2026 at 03:33 AM
- Score
- 7.0 / 10