Hello!

More than two and a half year after GnuCOBOL 3.1.2 the GnuCOBOL developers are proud to announce the formal release of GnuCOBOL 3.2.


What is GnuCOBOL
================

GnuCOBOL is a free, modern COBOL compiler.
It translates COBOL into intermediate C and compiles the code using a native C compiler (preferably GCC, but not limited to it).

More information about GnuCOBOL can be found at
https://www.gnu.org/software/gnucobol/


Noteworthy changes
==================

The amount of features are too much to note, but you can skip over the attached NEWS file to investigate them, here are some of the highlights:

* improved dialect handling including changed defaults to better match
  the selected dialect (see NEWS if you compile with any -std to know
  more about the implications), a complete new dialect GCOS and support
  for more COBOL statements, intrinsic functions and syntax from both
  "old" and new dialects

* highly improved run-times for several statements, along with
  less memory usage, especially if runtime checks are enabled

* fileio changes to support LINE-SEQUENTIAL per COBOL2023 and runtime
  options to change the way files are handled, see NEWS and runtime.cfg

* improvements for source-level debugging via GDB and coredump support

* improvements for reproducible builds

GnuCOBOL 3.x keeps full compatibility to GnuCOBOL 2.2, you can therefore use old COBOL modules without recompile, if needed, but may need to adjust your configuration per NEWS entry.


Getting the Software
====================

Official source kits can be downloaded from
   https://ftp.gnu.org/gnucobol/
but we suggest to use a mirror a nearby mirror for higher
download bandwidth:
   https://ftpmirror.gnu.org/gnucobol


NEWS - user visible changes                             -*- outline -*-

 GnuCOBOL 3.2     (20230728)

* New GnuCOBOL features

** Support for LINE SEQUENTIAL file type as per COBOL 2023
  * OPEN INPUT-OUTPUT and REWRITE are allowed (note that INPUT-OUTPUT
    leads to slower IO for LINE SEQUENTIAL files)
  * validation of data on (RE-)WRITE and READ, active by default,
    can be adjusted with the new runtime option COB_LS_VALIDATE

** New intrinsic functions

  BIT-OF, BIT-TO-CHAR, HEX-OF, HEX-TO-CHAR

** Support for COBOL 2023 directive COBOL-WORDS

** Support for bit operations according to COBOL 2023 with MF compatibility

** Support for additional $SET directives: ODOSLIDE

** Support for the EXTFH has been greatly enhanched and now includes support
   for FH--FCD and FH--KEYDEF, fixed use of different attributes and changing
   pointers and now supports - for 32-bit builds - an internal conversion
   between FCD2 and FCD3 for cases where existing programs are coded with FCD2

** OCCURS with multiple VALUEs supported (BS2000 format, FROM and TO pending)

** new function to call COBOL from C that doesn't abort the program in case
   of runtime errors or STOP RUN: cob_call_with_exception_check()

** Support for the GCOS 7 (Bull) dialect, including:
   * PICTURE strings with L character (variable length fields)
   * CONTROL DIVISION with SUBSTITUTION SECTION (full support) and DEFAULT
     SECTION (partial support)

** Multiple sequential files can be concatenated by specifying multiple
   files with a separator in the ASSIGN name (either directly or via
   environment), see the new runtime options
   COB_SEQ_CONCAT_NAME (defaults to false) and COB_SEQ_CONCAT_SEP

** Initial "testing support" of CODE-SET clause to convert between ASCII and
   EBCDIC on READ/WRITE/REWRITE for sequential and line-sequential files

** Initial "testing support" of FLOAT-EXTENDED (long double type)

** minimal "parsing support" for USAGE UTF-8 and UTF-8 literals

** Support to exit the runtime from COBOL as hard error (including possible
   [core-]dump and stacktrace) with "STOP ERROR" statement or by
   CALL "CBL_RUNTIME_ERROR"

** COB_PHYSICAL_CANCEL can now be configured as "never" to prevent unloading
   of COBOL modules, both on CANCEL and on process exit, which is useful for
   analysis tools such as callgrind or perf to keep all symbols until the end
   of the COBOL process

** the system function x'91' has been extended to support more functions

* Changes that potentially effect existing programs:

** ALLOCATE statement: earlier versions of GnuCOBOL initialized the memory
   (to binary zero) if the INITIALIZED clause was not specified,
   this isn't done anymore so if you need the memory to be initialized
   specify that explicit in the source and recompile

** variable-length RECORD SEQUENTIAL files, data validation on READ:
   the length of the record as stored in the file is now checked for correct
   format and is then compared against the record size defined in the program;
   if the minimal record size specified is bigger, then the data is only
   written up to the record length for that record, the other data is
   undefined and io status 04 returned; if the record length is bigger than
   the record size the record from the file is truncated, io status 04 set
   and the following READ will start at the next record;
   additionally on OPEN the length of the first record is read and if it
   isn't within the above rulesan io status 39 is returned; as the default
   format "COB_VARSEQ_TYPE = 0" contains two NULL bytes this will likely
   make most LINE SEQUENTIAL files not declared as this type fail on OPEN

** LINE SEQUENTIAL files, data validation: in case of bad printable data
   (less than SPACE) a READ may result in io status 09 and WRITE may error
   with io status 71; see the new runtime option COB_LS_VALIDATE to disable
   this validation (= old behavior) and to increase performance on line
   sequential file io;
   if LS_NULLS is active and invalid data (bad encoded or missing encoding)
   is found io status 71 is returned

** LINE SEQUENTIAL files, handling of records that are "too long":
   in case of "overflowing" records previous versions of GnuCOBOL cut the
   data, set io status 00 and skipped the file until the next line
   terminator is found;
   the default changed (per COBOL 2023 and other compilers) so the data is
   returned as "multiple" records and a warning (status 06) is issued;
   setting COB_LS_SPLIT = false will have the old behaviour of truncating
   the record, but will now set status 04

** FUNCTION RANDOM: the internal randomizer was changed from "C" to "GMP"
   this means that the sequence of random numbers are different when using
   the same seed as versions before 3.2
   while the changed use has the downside of taking longer for each seeding,
   it provides a much better distributed sequence and increases portability
   (switching to a different "C" runtime or operating system won't change the
   sequences); additional the implementor-defined default seeding was changed
   from "0 in most cases" to a random seed;
   if you _want_ the return values to be identical you always need to specify
   a seed (including possibly 0);
   the old behaviour can be enforced by compiling GnuCOBOL with
   LIBCOB_CPPFLAGS=-DDISABLE_GMP_RANDOM

** FUNCTION EXCEPTION-LOCATION: if the source raising an exception was not
   compiled with location information this function previously returned
   a single space; GnuCOBOL now always returns the module name, a procedure-
   name " " and the source (line) identifier "0"

** FUNCTIONs NUMVAL, NUMVAL-C, NUMVAL-F: if the argument does not match the
   argument rules previous versions returned zero; now invalid data is skipped;
   for example: "1. A-0B4.5" now returns -1.045 (or -1045 when the
   DECIMAL-POINT IS COMMA clause is in effect);
   as with previous versions the argument can be validated before using the
   FUNCTIONs TEST-NUMVAL, TEST-NUMVAL-C, TEST-NUMVAL-F or the exception can
   be checked afterwards using the EXCEPTION related functions;
   the old behaviour can be enforced by compiling GnuCOBOL with
   LIBCOB_CPPFLAGS=-DINVALID_NUMVAL_IS_ZERO

** Handling of invalid numeric USAGE DISPLAY data:
   previously the complete character was inspected and adjusted for conversion,
   now only the second half-byte is used;
   this yields in different results, for example both the zero and space
   character in both ASCII and EBCDIC charset will now result in a numeric
   zero; previously invalid data could result in huge or negative numbers in
   internal intermediate items;
   as this was both adjusted in the runtime and in the the generated modules
   invalid data may have additional unexpected results if programs are not
   recompiled

** ORGANIZATION INDEXED (with BDB backend): internal changes in record and
   file locking, fixing some related bugs

** extended screen io with PDCurses (most Win32 builds): blink and bolding
   are now enabled, when supported

** extended screen io: support for color codes 8-15 (implied highlight/blink
   attribute); only the three lower bits are now considered during evaluation
   of the color-number, leading to a previous value of 21 (which was ignored
   until now) being interpreted as 5, see FR #387

** extended screen io with single-fields: runtime-adjustable attributes by
   support of extension clauses COLOR and CONTROL for ACCEPT and DISPLAY
   statements, see FR #189 + FR #355; note: while COLOR and CONTROL are parsed
   for SCREEN SECTION they are ignored at runtime

** extended screen io with single-fields: the ACCEPT statement now supports
   the extension CURSOR clause, additional to the standard-defined
   CONTROL phrase in SPECIAL-NAMES

** the programmable runtime switches "SWITCH A" through "SWITCH Z" internally
   used 1-26 and now use 11-36 to be able to combine then with switches 0-7;
   if you set those via COB_SWITCH environment variables you need to adjust
   their numbers

* Changes that potentially effect recompilation of existing programs:

** the reserved word list and intrinsic functions was updated, especially
   to cater for new features of COBOL 2023; if compiling with any non-strict
   dialect you may need to unreserve any conflicting words / functions

** in 64-bit environments, the default size for BY VALUE parameters has changed:
   If no explicit SIZE IS clause is specified,
        old behavior: parameter passed as 32-bit value
        new behavior: parameter passed as 64-bit value
   To specify a 32-bit BY VALUE parameter, change the COBOL source to use
   SIZE IS 4.  To continue to rely on the default size, both caller and
   callee modules that use BY VALUE must be compiled with the same version of
   GnuCOBOL, either prior this release, or since.

** cobc now uses a two-pass preprocessing algorithm, where replacements for
   COPY-REPLACING are done in a first pass, and the replacements for
   REPLACE are done in a second pass. Note that, however, both
   statements are parsed before the first replacement pass, so
   COPY-REPLACING cannot impact a REPLACE statement itself.

* Changes to the COBOL compiler (cobc) options:

** new -fformat dialect option, and extended SOURCE FORMAT directives,
   with the following newly supported reference-formats (in addition
   to FIXED/FREE):

   COBOL85      Fixed-form format with enforcement of Area A
   COBOLX       GCOS 7 extended format
   CRT          ICOBOL Free-form format
   TERMINAL     ACUCOBOL-GT Terminal format
   VARIABLE     Micro Focus Variable Fixed-form format
   XCARD        ICOBOL xCard (extended card) format
   XOPEN        X/Open Free-form format

   These formats come with Area A enforcement (except for XOPEN), that
   checks whether division, section, and paragraph names start in Area
   A (i.e, before margin B), and so do level indicators FD, SD, RD,
   and CD, and level numbers 01, and 77.  The underlying checks are
   enabled or disabled by default using dialect option `areacheck`,
   and then with `$SET AREACHECK` and `$SET NOAREACHECK` compiler
   directives.

   As a result of reference format being a dialect option, Area A
   enforcement is available and enabled by default for dialects BS2000
   COBOL, CA Realia II, COBOL85, GCOS COBOL, IBM COBOL, MVS/VM COBOL,
   RM-COBOL, and X/Open COBOL.

   Area A enforcement additionally enables detection of missing
   periods before level numbers that lie in Area A in the DATA
   DIVISION, and before paragraph and section names in the PROCEDURE
   DIVISION.  More generally, some, but not all, missing periods can
   be reported and recovered from.  This is configurable with option
   `missing-period`.

   If not specified, the compiler tries to automatically recognize the format,
   using either fixed or free, depending on column 7 in the first non-space
   line. This feature can be disabled by setting the format manually
   with `-free`, `-fixed` or `-fformat`.

** the new -febcdic-table option enables one to specify the
   translation table used when dealing with EBCDIC codeset;
   these translation tables are stored as new configuration files with
   an extension of ".ttbl", currently available tables are:

   default    translation to extended ASCII as per MF
   alternate  translation from restricted ASCII only
   ebcdic500_ascii7bit   EBCDIC 500 <-> 7-bit ASCII as per IBM
   ebcdic500_ascii8bit   EBCDIC 500 <-> 8-bit ASCII as per GCOS7
   ebcdic500_latin1      EBCDIC 500 <-> latin-1 as per iconv

   This option supersedes the -falternate-ebcdic flag (still available
   for backwards compatibility), which is equivalent to
   -febcdic-table=alternate.

** the compile flag -fodoslide was moved to a dialect configuration,
   while -fodoslide still works as before it is now implied with
   -std=ibm/mvs/bs2000, if you use those dialects consider to recompile
   affected programs (with OCCURS DEPENDING ON) or compile with additional
   -fno-odoslide to get the same results as with older GnuCOBOL versions

** the compile flag -fdefaultbyte (initialization for data-items without
   an explicit VALUE) was moved to a dialect configuration;
   while -fdefaultbyte still works as before it is now implied as binary
   zero with -std=ibm/mvs/bs2000/realia, space for -std=mf/acu/rm, and
   no defined initialization for -std=cobol85/cobol2002/cobol2014/xopen,
   it is unchanged for -std=default (initialize to PICTURE/USAGE);
   for compatibility to previous behavior compile with -fdefaultbyte=init;
   note that initialization for INDEXED BY items honors the defaultbyte
   configuration now, too

** new dialect init-justified that applies right justification by JUSTIFIED
   clause for VALUE clause; this is applied to IBM dialects, if you want
   the previous behavior compile with -fno-init-justified

** depending on the new dialect option "using-optional" (included in the
   the default dialect), checks for arguments not passed are now done (only)
   on CALL, not on their (possibly many) references; if you want the old
   "postponed" check either specify the parameter as OPTIONAL or use
   -fusing-optional=skip; note: the non-strict dialects will raise a warning
   on the first use of this feature, then automatically enable it

** the dialect configuration option larger-redefines-ok was replaced by
   the support option larger-redefines; if specified on the command-line
   it is now -f[no-]larger-redefines instead of -f[no-]larger-redefines-ok,
   which allows to also raise a warning for those with -flarger-redefines=warn
   Note: the short one works both in current and older versions of cobc

** the subscript checking enabled with -fec=bound-subscript (implied with
   --debug) now generates checks depending on the new dialect configuration
   option subscript-check if OCCURS DEPNDING ON is used;
   the full check according to ISO COBOL, which checks against the ODO item
   is still used in the default dialect, but several dialects now only check
   against the maximum only

** the GnuCOBOL extension of auto-adding the RECURSIVE attribute
   if a program potentially calls its own PROGRAM-ID was moved
   to a dialect option; it is now only active with -std=default
   (and raises a warning as previously with -Wextra); if you want
   to use this extension for other dialects use the new
   -fself-call-recursive=warning (or "ok")

** the option -g does no longer imply -fsource-location; but it auto-includes
   references to the COBOL-paragraphs to further ease source level debugging

** -fsource-location generates source references to copyboooks in DATA
   DIVISION, enabling to inspect the initial VALUE setting as well as
   "list"ing those copybooks with a source level debugger

** new flag -fstack-extended (implied with --debug and --dump) to include
   the origin of entrypoints and PERFORM, this is used for the internal
   stack trace on abort and can be used for improved source level debugging

** new flag -fmemory-check (implied with --debug) to do some validation
   of internal memory used during CALL; this can help in finding otherwise
   hard to diagnose overwrite of memory and as it is only done on CALL
   has a much smaller footprint than -fec=bounds (as both check different
   aspects at different places it is also reasonable to use both);
   to disable it use -fmemory-check=none or limit by -fmemory-check=pointer

** the option -g does no longer imply -fno-remove-unreachable; if you want to
   keep those in you need to explicit specify this

** the option -O0 now implies -fno-remove-unreachable

** new options to ensure structured code-flow:
   -fsection-exit-check to ensure sections don't "fall through" (are always
    entered and left by PERFORM)
   -fimplicit-goback-check to ensure modules are not left by implicit GOBACK
    at end of PROCEDURE DIVISION

** adjustments to warning options:
   -Wconstant-expression was changed to a group warning and includes
    the new, previously integrated, -Wconstant-numlit-expression
   -Wtyping as a new warning raises only very suspicious MOVEs,
   -Wstrict-typing, which will warn as before even for MOVE 1 TO PICX-FLD
    is not included in -Wall any more
   -Wlarger-01-redefines as new warning (enabled by -Wextra) to check for
    the only larger REDEFINES that is explicit allowed by the COBOL standard
   -Wno-unsupported -Wunsupported new option to disable or only warn
    on use of features the runtime is not configured for;
    this new option defaults to an error (= -Werror=unsupported)
   -Wgoto-different-section as new warning (enabled by -Wall) to check for
    GO TO that are likely to break the flow of PERFORM some-section
   -Wgoto-section as new warning (enabled by default) to check for
    GO TO a section instead of a paragraph; while allowed this is often
    a coding error
   -Wsuspicious-perform-thru (enabled by default) to check for PERFORM ranges
    that are likely to create unwanted behaviour
   -Wother now  warns for suspicious reference-modification which is likely to
    create out-of-bounds access at runtime

** new compiler command line option to list the known runtime exception names
   and fatality `cobc --list-exceptions`

** new compiler command line option -ftcmd to enable printing of the command
   line in the source listing, -fno-timestamp to suppress printing of the time
   and -ftittle to set a title instead of GnuCOBOL and version (_ chars are
   replaced by spaces in the title)

** new compiler command line option --coverage to instrument binaries
   for coverage checks

** the command line options -MT and -MF, which are used for creating a
   dependency list (used copybooks) to be used for inclusion in Makefiles
   or other processes, and which were removed in GnuCOBOL 2 are back in their
   original version; note: their use will be adjusted where they don't match
   GCC's same options in later versions, including addition of -M and -MD

** new -std options:

   gcos            GCOS compatibility
   gcos-strict     GCOS compatibility                - strict

   We define the GCOS dialect based on the COBOL85 standard, with new
   dialect configuration options accompanying each specificity
   introduced by the dialect.

** new diagnostic format for errors: the diagnostics now print the source
   code context with a left margin showing line numbers, configurable with
   -fno-diagnostics-show-line-numbers, and possible to disable completely
   with -fno-diagnostics-show-caret;

   the option -fdiagnostics-plain-output was added to request that diagnostic
   output look as plain as possible and stay more stable over time

** the -P flag accepts - as argument for stdout

* Important Bugfixes:

** for dialects other than the GnuCOBOL default different reserved "alias" words
   were not usable, for example SYNCHRONIZED or COMPUTATIONAL. This was fixed
   and reserved words updated for the dialects "acu" (to ACUCOBOL-GT 10.4),
   "ibm" (to Enterprise COBOL 6.3) and "mf" (to Micro Focus Visual COBOL 6.0)

** for all "lax" varants SYNC was handled even if commonly ignored by the strict
   dialects, this was fixed so SYNC is ignored depending on the dialect

** COBOL programs compiled with versions before GnuCOBOL 3 that used files with
   ORGANIZATION INDEXED or RELATIVE crashed when executed with newer versions,
   this has been fixed so that all modules compiled with GnuCOBOL 2.2 can be
   executed with GnuCOBOL 3.2

** FUNCTION RANDOM could return 1 in rare cases (more likely on win32),
   it now returns a value in the range 0 <= x < 1, as defined

** the internal signal handler could crash or deadlock the process on hard
   errors (either in called library functions or when running COBOL without
   runtime checks); the signal handling is now completely rewritten to fix
   this issue and all executed code from the signal handler but the COBOL data
   dump is now signal and thread safe

** TYPEDEF items got storage and attribute assigned, leading to bigger modules,
   longer loading time and longer compile times; if you use those a recompile
   is highly suggested

** several bugs in COPY REPLACING / REPLACING were fixed along with adding
   support for exensions related to REPLACING LEADING / TRAILING

** for PICTURE P several fixes were made, so results may vary compared with
   previous versions; sources with *leading* P never worked correct before,
   and *must* be recompiled after upgrading

** since its addition to GnuCOBOL ROUNDING MODE PROHIBITED just prevented
   rounding; its behaviour changed to match the specification by doing that,
   raising EC-SIZE-TRUNCATION and changed: not adjust the target field if
   rounding would be necessary to store the data

* Listing changes

** the timestamp in the header was changed from ANSI date format like
   "Tue Sep 28 09:49:43 2021" to formatted time (year after day); this may be
   changed during `configure` with adding a define to COBC_CPPFLAGS;
   to either use the old format, adding add `-DLISTING_TIMESTAMP_ANSI`,
   or to use an explicit format (cut at 26 characters, may raise false-positives
   in listing tests) e.g. date only `-DLISTING_TIMESTAMP_FORMAT="%Y-%m-%d"`

** new compile options to adjust the listing, see above

* More notable changes

** in general, the maximum field size in LINKAGE SECTION was increased from
   268435456 bytes (999999998 bytes for OCCURS UNBOUNDED) to the system
   specific INT_MAX - 1, which is commonly 2 GB

** in 64-bit environments, the maximum field size outside of LINKAGE SECTION
   was increased from 268435456 bytes to 2 GB

** numeric DISPLAY can store and may contain a positive zero after arithmetic,
   PACKED-DECIMAL may contain negative zero (x'0D') after arithmetic; as before
   numeric comparisions to ZERO / 0 / +0 / -0 will all be identical

** quotes around filenames and parts that are resolved by environment variables
   are internally ignored

** the exception check for EC-PROGRAM-ARG-MISMATCH is now generated, validating
   that non-optional PROCEDURE DIVISION USING items are passed and that their
   size in the caller is at least as big as in the program

** in case of any runtime features being used that are not available an error
   is generated during compile (may be reduced to a warning by -Wunsupported
   or be suppressed by -Wno-unsupported) and if the feature is actually used
   at runtime a related exception status is set

** the call-stack show on error and/or in the dump file now contains all
   parameters given to the program via command line options, if any;
   if full debugging information is available it includes all PERFORMs executed

** the dump that is created on abort for all programs that were compiled with
   -fdump can be explicit disabled by setting COB_DUMP_FILE=NONE; it is
   automatically disabled if the process ends upon signals SIGINT/SIGTERM and
   now also disabled upon SIGHUP/SIGPIPE

** additional or instead of the internal COBOL dump a coredump file may be
   created on runtime errors and when configured in the system also after
   the signal handler; see the new runtime option COB_CORE_ON_ERROR for
   details (the default is a best match to the old behavior)

** source references shown in diagnostic messages and for trace at runtime
   as well as during debugging were extended, for example each executed WHEN,
   VARYING and UNTIL phrases are now seen

** condition-names are made available for source-level debugging

** cobc's parsing time was significantly reduced for big programs

** execution times were significantly reduced for the following:
        INSPECT that use big COBOL fields (multiple KB)
        MOVE and comparisions in general (especially with enabled runtime
           checks, to optimize those a re-compile is needed)
        CALL data-item, and first time for each CALL
        ACCEPT DATE/TIME/DAY, most if numeric items are accepted
        datetime related FUNCTIONs
        runtime checks for use of LINKAGE/BASED fields and/or
          subscripts/reference-modification (re-compile needed)
        general: execution of programs generated with -fsource-location
          (implied with --debug and -fec), especially when many "simple"
          statements or lot of sections/paragraphs are used (re-compile needed)

* New system functions

  CBL_GC_SET_SCR_SIZE  option to resize extended screen

* New build features

** configure now honors BDB_LIBS and BDB_CFLAGS
** configure now honors MATH_LIBS
** configure now checks for XCurses and allows --with-curses=xcurses
   (experimental)
** configure now checks for PERL and passes that as default to make test
** cobc handles SOURCE_DATE_EPOCH now, allowing to override timestamps in
   generated code and listing files, allowing reproducible builds of both
   GnuCOBOL (extras folder) and COBOL programs

* Obsolete features (will be removed in the next version if no explicit user
  requests are raised)

** use of old non-GMP randomizer for FUNCTION RANDOM

** undocumented option -tsymbols, which was replaced by -ftsymbols in 3.0


* Known issues in 3.2 (and 3.1)

** testsuite:
  * if built with vbisam, cisam or disam, depending on the version used, some
    tests will lead to UNEXPECTED PASS, while others may fail
  * possibly failing tests (false positives):
    * temporary path invalid
    * compiler outputs (assembler)
    * compile from stdin
  * NIST: OBNC1M.CBL false positive (the test runner uses a nonportable way of
    emulating a program kill)
  * if build with -fsanitize, then some tests will fail; while we accept patches
    to improve that, we don't consider the failing tests as bug in GnuCOBOL

** the recent additions of ">> TURN" and "variable LIKE variable" may not work
   as expected in all cases

** floating-point comparison for equality may return unexpected results as it
   involves a necessary tolerance; you may adjust the default tolerance of
   0.0000001 by compiling GnuCOBOL for example with
   LIBCOB_CPPFLAGS="-DCOB_FLOAT_DELTA=0.0000000000001";
   we seek input for a reasonable default for GnuCOBOL 4 (use the mailing list
   or discussion board to share your comments on this topic, keeping in mind
   that this has to take both mathematical and "C compiler portability" into
   account)

** variables containing PICTURE symbol P may lead to wrong results in rare
   cases (especially screenio) - please send a bug report if you catch a case;
   since GC 3.2 rc3 all arithmetic operations and MOVE are believed to be
   correct

** features that are known to not be portable to every environment yet
   (especially when using a different compiler than GCC)
    * function with variable-length RETURNING item
    * USAGE POINTER, which may need to be manually aligned

** all versions of GnuCOBOL so far: EVALUATE evaluates all subjects on *each*
   WHEN (the standard explicit requests a one-time evaluation of the subjects,
   then comparing the value); to work around possible issues move more complex
   subjects like variables with subscripts and reference-modification, as well
   as calculated subjects and function calls to a temporary variable and use
   this as subject for the EVALUATE

For more known issues see the bug tracker.

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