-a

assignment causes implicit narrowing conversion

conversion to larger integral type may sign-extend incorrectly

-b

statement not reached (unreachable break and empty statements)

-h

assignment operator "=" found where equality operator "==" was expected

constant operand to op: "!"

fallthrough on case statements

pointer cast may result in improper alignment

precedence confusion possible; parenthesize

statement has no consequent: if

statement has no consequent: else

-m

declared global, could be static

-erroff=tag

由 tag 指定的一条或多条 lint 消息

-u

name defined but never used

name used but not defined

-v

arguments unused in function

-x

name declared but never used or defined