[masklinn]

The GCC equivalent being, I believe,

    -Wall -Wextra -Werror

[mahkoh]

GCC has no equivalent of -Weverything. -Wall and -Wextra leave lots of warnings disabled.

[DSMan195276]

AFAIK Gcc doesn't have a -Weverything equivalent (-Wall and -Wextra are close, but don't enable every warning possible, -Weverything does).