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Lightning Talk: Upgrading The Compiler Isn't Free

on YouTube 04m
Lightningat CppCon 2021 · on Sunday, 2021-10-24· [engineering-leadership, devops-and-delivery]

speaker

name:Andre Kostur
links:none on file

resources

video:https://youtu.be/bXx3-drA_oI
slides:none on file

summary

Upgrading compilers uncovers concrete, costly failures: memset on a non-trivial class triggers new warnings, test suites fail when unordered_set iteration order reveals unspecified behavior, an enum-list left shift (a left shift of 70 bits) exposes undefined behavior that different optimizers handle differently, and standard enum comparisons produce surprising warnings about sign mismatch. Troubleshooting spans coordinating hundreds of developers and many packages; moving from gcc 83 vs gc84 changes whether code silently behaves or loudly breaks.

AI-written summary · about

chapters (6)

  1. 0:00Introduction
  2. 0:19Assumptions
  3. 0:49Warnings
  4. 2:15Undefined Behavior Example
  5. 3:01Compiler Bugs
  6. 3:40Conclusion

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