ifdef OPTIMIZE
# Performance build: make OPTIMIZE=1
# `override` so a command-line `make OPTIMIZE=1` is remapped to -O3 too;
# without it, a command-line assignment wins over this `:=` and the literal
# `1` leaks into CXXFLAGS (g++ then treats `1` as an input file).
override OPTIMIZE := -O3
SANITIZE :=
else ifdef NOPYTHON
OPTIMIZE := -O0 -g -DNOPYTHON
SANITIZE :=
else
# Debug build (default): includes AddressSanitizer
OPTIMIZE := -O0 -g
SANITIZE := -fsanitize=address -fno-omit-frame-pointer
endif