My list of useful compilation flags

flags.md

Warnings:

• -Weverything - even more than -Wpedantic in Clang

Debugging:

• -g - Preserve debugging symbols
• -fno-omit-frame-pointer - if some symbols remain broken
• -fno-builtin - Do not perform some printf, scanf, malloc, etc. optimizations (debugging is easier)
• -fsanitize=address - Use address sanitizer
• -fsanitize=thread - Use thread sanitizer
• -fsanitize=undefined - Use UB sanitizer
• -fsanitize=memory - Use memory sanitizer
• -masm=intel - Use Intel asm syntax
• -fverbose-asm - Add some comments to assembly output

Performance:

• -ffast-math - Allow FP operations to break strict IEEE compilance
• -ftree-vectorize - Allow loops vectorization
• -march=native/skylake - Optimize for Skylake architecture (I don't think Coffe Lake is here yet)

Shared libraries:

• -shared - Compile as a shared library
• -fPIC - Generate position independent code