C/C++ Compilers

Guidance for compiling, analyzing, and optimizing C and C++ code with GCC and Clang in 2026.

Reference files

GCC specifics: gcc.md -- flags, diagnostics, PGO, LTO, error triage
Clang specifics: clang.md -- diagnostics, optimization remarks, clang-tidy, macOS
Sanitizers: sanitizers.md -- ASan, UBSan, TSan, MSan, LSan decision tree and reports
Static analysis: static-analysis.md -- clang-tidy, cppcheck, scan-build, CI integration
Modern C/C++: modern-cpp.md -- C++20 modules, C++23/26 features, C23, migration

Language	Preferred standard	GCC support	Clang support
C	`-std=c23` (or `-std=c17` for broad compat)	GCC 15+	Clang 18+
C++	`-std=c++23` (or `-std=c++20` minimum)	GCC 14+	Clang 18+