Warning options:

-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 mentioned * ALWAYS active

-Wno-ignored-error

do not warn about errors in unreachable code parts 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 about lack of parentheses around AND within OR

-Wstrict-typing

warn strictly about type mismatch

-Wimplicit-define

warn about implicitly defined data items * 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

-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 source text after program-area * NOT set with -Wall

-Wno-others

do not warn about different issues * ALWAYS active

-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

Compiler options:

-fsign=[ASCII|EBCDIC] define display sign representation

* default: machine native

-ffold-copy=[UPPER|LOWER]

fold COPY subject to value * default: no transformation

-ffold-call=[UPPER|LOWER]

fold PROGRAM-ID, CALL, CANCEL subject to value * default: no transformation

-fdefaultbyte=<value> initialize fields without VALUE to value

* decimal 0..255 or any quoted character * default: initialize to picture

-fmax-errors=<number> maximum number of errors to report before

compilation is aborted * default: 128

-fintrinsics=[ALL|intrinsic function name(,name,...)]

intrinsics to be used without FUNCTION keyword

-fdump=<scope>

dump data fields on abort, <scope> may be a combination of: ALL, WS, LS, RD, FD, SC, LO

-fcallfh=<name>

specifies <name> to be used for I/O as external provided EXTFH interface module

-fno-remove-unreachable

disable remove of unreachable code * turned off by -g

-ftrace

generate trace code * scope: executed SECTION/PARAGRAPH

-ftraceall

generate trace code * scope: executed SECTION/PARAGRAPH/STATEMENTS

-fsyntax-only

syntax error checking only; don't emit any output

-fdebugging-line

enable debugging lines * 'D' in indicator column or floating >>D

-fsource-location

generate source location code * turned on by -debug/-g/-ftraceall/-fec

-fimplicit-init

automatic initialization of the COBOL runtime system

-fno-recursive-check

disable check of recursive program call; effectively compiling as RECURSIVE program

-fstack-check

PERFORM stack checking * turned on by -debug or -g

-fwrite-after

use AFTER 1 for WRITE of LINE SEQUENTIAL * default: BEFORE 1

-fmfcomment

'*' or '/' in column 1 treated as comment * FIXED format only

-facucomment

'$' in indicator area treated as '*', '|' treated as floating comment

-fnotrunc

allow numeric field overflow * non-ANSI behaviour

-fodoslide

adjust items following OCCURS DEPENDING * implies -fcomplex-odo

-fsingle-quote

use a single quote (apostrophe) for QUOTE * default: double quote

-foptional-file

treat all files as OPTIONAL * unless NOT OPTIONAL specified

-fstatic-call

output static function calls for the CALL statement

-fno-gen-c-decl-static-call

disable generation of C function declations for subroutines with static CALL

-fgen-c-line-directives

generate source location directives in C code; * turned on by -g

-fgen-c-labels

generate extra labels in C sources; * turned on by -g

-fno-theaders

suppress all headers and output of compilation options from listing while keeping page breaks

-fno-tsource

suppress source from listing

-fno-tmessages

suppress warning and error summary from listing

-ftsymbols

specify symbols in listing

-fno-diagnostics-show-option

suppress output of option that directly controls the diagnostic

Compiler dialect configuration options:

-freserved-words=<value>

use of complete/fixed reserved words

-ftab-width=1..12

set number of spaces that are assumed for tabs

-ftext-column=72..255

set right margin for source (fixed format only)

-fpic-length=<number>

maximum number of characters allowed in the PICTURE character-string

-fword-length=1..63

maximum word-length for COBOL (= programmer defined) words

-fliteral-length=<number>

maximum literal size in general

-fnumeric-literal-length=1..38

maximum numeric literal size

-fbinary-size=<value>

binary byte size - defines the allocated bytes according to PIC, may be one of: 2-4-8, 1-2-4-8, 1--8

-fbinary-byteorder=<value>

binary byte order, may be one of: native, big-endian

-fassign-clause=<value>

how to interpret 'ASSIGN word': as 'ASSIGN EXTERNAL word' or 'ASSIGN DYNAMIC word', may be one of: dynamic, external, ibm (= external), mf (= dynamic)

-fscreen-section-rules=<value>

which compiler's rules to apply to SCREEN SECTION item clauses, may be one of: acu, gc, mf, rm, std, xopen

-fdpc-in-data=<value>

whether DECIMAL-POINT IS COMMA has effect in XML/JSON GENERATE, may be one of: none, xml, json, all

-ffilename-mapping

resolve file names at run time using environment variables

-fpretty-display

alternate formatting of numeric fields

-fbinary-truncate

numeric truncation according to ANSI

-fcomplex-odo

allow complex OCCURS DEPENDING ON

-findirect-redefines

allow REDEFINES to other than last equal level number

-flarger-redefines-ok

allow larger REDEFINES items

-frelax-syntax-checks

allow certain syntax variations (e.g. REDEFINES position)

-fref-mod-zero-length

allow zero length reference-modification (only changed with EC-BOUND-REF-MOD active)

-frelax-level-hierarchy

allow non-matching level numbers

-fselect-working

require ASSIGN USING items to be in WORKING-STORAGE

-flocal-implies-recursive

LOCAL-STORAGE SECTION implies RECURSIVE attribute

-fsticky-linkage

LINKAGE SECTION items remain allocated between invocations

-fmove-ibm

MOVE operates as on IBM (left to right, byte by byte)

-fperform-osvs

exit point of any currently executing perform is recognized if reached

-farithmetic-osvs

limit precision in intermediate results to precision of final result (less accurate)

-fconstant-folding

evaluate constant expressions at compile time

-fhostsign

allow hexadecimal value 'F' for NUMERIC test of signed PACKED DECIMAL field

-fprogram-name-redefinition

program names don't lead to a reserved identifier

-faccept-update

set WITH UPDATE clause as default for ACCEPT dest-item, instead of WITH NO UPDATE

-faccept-auto

set WITH AUTO clause as default for ACCEPT dest-item, instead of WITH TAB

-fconsole-is-crt

assume CONSOLE IS CRT if not set otherwise

-fno-echo-means-secure

NO-ECHO hides input with asterisks like SECURE

-fline-col-zero-default

assume a field DISPLAY starts at LINE 0 COL 0 (i.e. at the cursor), not LINE 1 COL 1

-fdisplay-special-fig-consts

special behaviour of DISPLAY SPACE/ALL X'01'/ALL X'02'/ALL X'07'

-fbinary-comp-1

COMP-1 is a 16-bit signed integer

-fnumeric-pointer

POINTER is a 64-bit unsigned integer

-fmove-non-numeric-lit-to-numeric-is-zero

imply zero in move of non-numeric literal to numeric items

-fimplicit-assign-dynamic-var implicitly define a variable if an ASSIGN DYNAMIC does not match any data item

-fcomment-paragraphs=<support>

comment paragraphs in IDENTIFICATION DIVISION (AUTHOR, DATE-WRITTEN, ...)

-fmemory-size-clause=<support>

MEMORY-SIZE clause

-fmultiple-file-tape-clause=<support> MULTIPLE-FILE-TAPE clause

-flabel-records-clause=<support>

LABEL-RECORDS clause

-fvalue-of-clause=<support>

VALUE-OF clause

-fdata-records-clause=<support>

DATA-RECORDS clause

-ftop-level-occurs-clause=<support>

OCCURS clause on top-level

-fsame-as-clause=<support>

SAME AS clause

-ftype-to-clause=<support>

TYPE TO clause

-fusage-type=<support>

USAGE type-name

-fsynchronized-clause=<support>

SYNCHRONIZED clause

-fspecial-names-clause=<support>

SPECIAL-NAMES clause

-fgoto-statement-without-name=<support>

GOTO statement without name

-fstop-literal-statement=<support>

STOP-literal statement

-fstop-identifier-statement=<support> STOP-identifier statement

-fdebugging-mode=<support>

DEBUGGING MODE and debugging indicator

-fuse-for-debugging=<support> USE FOR DEBUGGING

-fpadding-character-clause=<support>

PADDING CHARACTER clause

-fnext-sentence-phrase=<support>

NEXT SENTENCE phrase

-flisting-statements=<support>

listing-directive statements EJECT, SKIP1, SKIP2, SKIP3

-ftitle-statement=<support>

listing-directive statement TITLE

-fentry-statement=<support>

ENTRY statement

-fmove-noninteger-to-alphanumeric=<support>

move noninteger to alphanumeric

-fmove-figurative-constant-to-numeric=<support>

move figurative constants to numeric

-fmove-figurative-space-to-numeric=<support>

move figurative constant SPACE to numeric

-fmove-figurative-quote-to-numeric=<support>

move figurative constant QUOTE to numeric

-fodo-without-to=<support>

OCCURS DEPENDING ON without to

-fsection-segments=<support>

section segments

-falter-statement=<support>

ALTER statement

-fcall-overflow=<support>

OVERFLOW clause for CALL

-fnumeric-boolean=<support>

boolean literals (B'1010')

-fhexadecimal-boolean=<support>

hexadecimal-boolean literals (BX'A')

-fnational-literals=<support> national literals (N'UTF-16 string')

-fhexadecimal-national-literals=<support>

hexadecimal-national literals (NX'265E')

-fnational-character-literals=<support>

non-standard national literals (NC'UTF-16 string')

-fhp-octal-literals=<support> HP COBOL octal literals (%377)

-facu-literals=<support>

ACUCOBOL-GT literals (#B #O #H #X)

-fword-continuation=<support> continuation of COBOL words

-fnot-exception-before-exception=<support>

NOT ON EXCEPTION before ON EXCEPTION

-faccept-display-extensions=<support> extensions to ACCEPT and DISPLAY

-frenames-uncommon-levels=<support>

RENAMES of 01-, 66- and 77-level items

-fsymbolic-constant=<support> constants defined in SPECIAL-NAMES

-fconstant-78=<support>

constant with level 78 item (note: has left to right precedence in expressions)

-fconstant-01=<support>

constant with level 01 CONSTANT AS/FROM item

-fperform-varying-without-by=<support>

PERFORM VARYING without BY phrase (implies BY 1)

-freference-out-of-declaratives=<support>

references to sections not in DECLARATIVES from within DECLARATIVES

-fprogram-prototypes=<support>

CALL/CANCEL with program-prototype-name

-fcall-convention-mnemonic=<support>

specifying call-convention by mnemonic

-fcall-convention-linkage=<support>

specifying call-convention by WITH ... LINKAGE

-fnumeric-value-for-edited-item=<support>

numeric literals in VALUE clause of numeric-edited items

-fincorrect-conf-sec-order=<support>

incorrect order of CONFIGURATION SECTION paragraphs

-fdefine-constant-directive=<support> allow >> DEFINE CONSTANT var AS literal

-ffree-redefines-position=<support>

REDEFINES clause not following entry-name in definition

-frecords-mismatch-record-clause=<support>

record sizes does not match RECORD clause

-frecord-delimiter=<support>

RECORD DELIMITER clause

-fsequential-delimiters=<support>

BINARY-SEQUENTIAL and LINE-SEQUENTIAL phrases in RECORD DELIMITER

-frecord-delim-with-fixed-recs=<support>

RECORD DELIMITER clause on file with fixed-length records

-fmissing-statement=<support> missing statement (e.g. empty IF / PERFORM)

-fzero-length-literals=<support>

zero-length literals, e.g. '' and ""

-fxml-generate-extra-phrases=<support>

XML GENERATE's phrases other than COUNT IN

-fcontinue-after=<support>

AFTER phrase in CONTINUE statement

-fgoto-entry=<support>

ENTRY FOR GOTO and GOTO ENTRY statements

-fassign-variable=<support>

ASSIGN [TO] variable in SELECT

-fassign-using-variable=<support>

ASSIGN USING/VARYING variable in SELECT

-fassign-ext-dyn=<support>

ASSIGN EXTERNAL/DYNAMIC in SELECT

-fassign-disk-from=<support>

ASSIGN DISK FROM variable in SELECT

-fvsam-status=<support>

VSAM status in FILE STATUS

where <support> is one of the following: 'ok', 'warning', 'archaic', 'obsolete', 'skip', 'ignore', 'error', 'unconformable'

-fnot-reserved=<word>

word to be taken out of the reserved words list

-freserved=<word>

word to be added to reserved words list

-freserved=<word>:<alias>

word to be added to reserved words list as alias

-fnot-register=<word>

special register to disable

-fregister=<word>

special register to enable