Question

-Wall

enable most warnings (all except as noted below)

-Wextra

like -Wall but enable some extra warning flags

-w

disable all warnings

-Wno-warning

disable warning enabled by default, -Wall or -Wextra

-Wadditional

additional warnings only raised with -Wall

-Wno-unfinished

do not warn if unfinished features are used; always active

-Wno-pending

do not warn if pending features are used; always active

-Wno-repository-checks

do not warn/check for program/function/external signature mismatch; always active

-Wno-ignored-error

do not warn about errors in code parts which are unreachable and so normally ignored; always active

-Wobsolete

warn if obsolete features are used

-Warchaic

warn if archaic features are used

-Wredefinition

warn about non-referenced ambiguous data items

-Wtruncate

warn about field truncation from constant assignments

-Wpossible-truncate

warn about possible field truncation; not set with -Wall

-Woverlap

warn about overlapping MOVE of items

-Wpossible-overlap

warn about MOVE of items that may overlap depending on variables; not set with -Wall

-Wparentheses

warn if parentheses are omitted around AND within OR

-Wstrict-typing

warn strictly about type mismatch

-Wimplicit-define

warn whenever data items are implicitly defined; not set with -Wall

-Wno-corresponding

do not warn about CORRESPONDING with no matching items; always active

-Winitial-value

warn if initial VALUE clause is ignored

-Wprototypes

warn about missing FUNCTION prototypes/definitions

-Warithmetic-osvs

warn if arithmetic expression precision has changed

-Wcall-params

warn about non 01/77 items for CALL parameters; not set with -Wall

-Wconstant-expression

warn about expressions that always resolve to true/false

-Wconstant-numlit-expression

warn about numeric expressions that always resolve to true/false

-Wlarger-01-redefines

warn about larger redefines allowed by COBOL standards

-Wcolumn-overflow

warn about text after program-text area, FIXED format; not set with -Wall

-Wterminator

warn about lack of scope terminator END-XXX; not set with -Wall

-Wlinkage

warn about dangling LINKAGE items; not set with -Wall

-Wunreachable

warn about likely unreachable statements; not set with -Wall

-Wno-dialect

do not warn about dialect specific issues; always active

-Wdangling-text

warn about source text after program-area; not set with -Wall

-Wno-missing-newline

do not warn about missing newlines; always active

-Wno-others

do not warn about different issues; always active

-Wno-unsupported

do not warn if runtime does not support a feature used

-Werror

treat all warnings as errors

-Wno-error

don’t treat warnings as errors

-Werror=warning

treat specified warning as error

-Wno-error=warning

don’t treat specified warning as error