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Explore how modern compiler optimizations in C and C++ can create unexpected security vulnerabilities and software faults in this comprehensive conference talk from ACCU 2025. Learn about the increasingly aggressive optimization techniques that compiler writers employ by exploiting undefined behaviors in C and C++ programming languages, and discover how these optimizations can interfere with developers' ability to perform cause-effect analysis on their source code. Understand the concept of causality elimination in software and its direct impact on increasing the probability of software faults, defects, and security vulnerabilities. Examine specific examples of common dangerous optimizations and their real-world implications for software reliability and security. Gain practical knowledge of applicable mitigation strategies that can help protect your code from these optimization-related issues while maintaining performance benefits. Presented by Robert C. Seacord, a recognized expert on the ISO/IEC JTC1/SC22/WG14 international standardization working group for the C programming language and author of multiple authoritative books on secure coding practices including "Effective C" and "The CERT C Coding Standard."
