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Compaq COBOL on its Alpha platforms (OpenVMS and Tru64 UNIX) is based on and is highly compatible with Compaq COBOL for OpenVMS VAX. However, there are differences, which are summarized in this appendix.1 Knowing the differences can help you develop COBOL applications that are compatible with other platforms, and can help you migrate your Compaq COBOL for OpenVMS VAX applications to Compaq COBOL on an Alpha platform.
1 Because this appendix is comparative and full of system-specific information, the diamond (<>) that elsewhere in the manual signals the end of system-specific sections is not used here except once, at the end of the appendix. |
Table B-1 shows the current (as of the date of publication of this manual) state of compatibility for numerous features in Compaq COBOL on its three platforms. Always check the Release Notes for the latest developments if there is a question about the availability of a given feature.
Legend X = Supported N = Not supported P = Partially supported |
OpenVMS VAX | OpenVMS Alpha | Tru64 UNIX | |
---|---|---|---|
/CHECK=DECIMAL | N | X | X |
/CHECK=(PERFORM,BOUNDS) | X | X | X |
/STANDARD=V3 | X | P | P |
18-digit intermediates | X | X | X |
31-digit user items | N | X | X |
32-digit intermediates | N | X | X |
64-bit pointers | N | P | X |
ACCEPT/DISPLAY BLINK | X | X | X |
ACCEPT/DISPLAY WITH CONVERSION | X | X | X |
ACCEPT/DISPLAY, extended | X | X | X |
ACCEPT support for four-digit years | X | X | X |
Alignment: Alpha natural, and padding | N | X | X |
Alignment: VAX compatible | X | X | X |
ANSI-74 FILE STATUS support | X | X | X |
ANSI-85 REPORT WRITER | X | X | X |
ANSI-85/-89/-93 HIGH | X | X | X |
Arithmetic, standard | N | P | P |
CALL USING BY DESCRIPTOR | X | X | N |
Floating point: "E" literal | X | X | X |
Floating point: F,D floating | X | X | N |
Floating point: G floating | N | X | N |
Floating point: IEEE S,T floating | N | X | X |
FUNCTION ARGCOUNT | X | X | N |
Internationalization (PIC N, etc.) | X | X | X |
Invalid decimal data checking | P | P | P |
ISAM key checking | X | X | X |
ISAM keys, segmented | X | X | X |
ISAM READ PRIOR/START LESS | N | X | X |
Little-endian COMP data | X | X | X |
Locking: UCX/NFS support (nolocking) | N | N | X |
Locking: file sharing and record locking | X | X | X |
Oracle CDD/DML support | X | X | N |
Reformat | X | X | X |
RMS special registers | X | X | N |
Symbolic debugger support | X | X | X |
SYS$CURRENCY | X | X | N |
Table sort | N | X | X |
Tape handling | X | X | X |
Terminal source format | X | X | X |
Tools: | |||
DECset PCA, LSE/SCA support | X | X | N |
DECset PDF support | X | N | N |
FUSE support | N | N | X |
Transarc Encina (-tps) support | N | N | X |
VFC, print control files with | X | X | N |
VFC, print control files without | N | X | X |
X/Open | N | P | P |
ASSIGN TO | N | X | X |
Command line | N | X | X |
COMP-5/COMP-X | N | X | X |
DISPLAY ON EXCEPTION | N | X | X |
Environment variables | N | X | X |
File sharing / record locking | N | X | X |
LINE SEQUENTIAL | N | X | X |
RETURN-CODE | N | X | X |
SCREEN SECTION | N | X | X |
Y2K intrinsic functions | X | X | X |
Compaq COBOL on Alpha contains the following language extensions and other features that are not in Compaq COBOL on VAX:
Compaq COBOL on Alpha does not contain the following VAX features:
Compaq COBOL on Alpha includes the following:
Sections B.3.1, B.3.2, and B.3.3 compare the
Compaq COBOL command-line qualifiers and flags on the three operating
systems. For more information about Compaq COBOL command-line
qualifiers on the OpenVMS Alpha or VAX operating system, invoke the
online help facility: Type
HELP COBOL
at the OpenVMS system prompt. For more information on the flags,
refer to the man page: Type
man cobol
at the Tru64 UNIX system prompt.
B.3.1 Qualifiers and Flags Shared by Compaq COBOL on Alpha and VAX
Table B-2 lists the OpenVMS command-line qualifiers shared by Compaq COBOL on Alpha and VAX and the equivalent flags on Tru64 UNIX.
OpenVMS Qualifier | Equivalent Tru64 UNIX Flag1 |
---|---|
/ANALYSIS_DATA | None |
/ANSI_FORMAT | -ansi |
/AUDIT | None |
/CHECK 2 | -check |
/CONDITIONALS | -conditionals |
/COPY_LIST | -copy_list |
/CROSS_REFERENCE | -cross_reference |
/DEBUG | -g |
/DEPENDENCY_DATA | None |
/DIAGNOSTICS | None |
/FIPS 2 | -fips 74 |
/FLAGGER | -flagger |
/LIST | -list |
/MACHINE_CODE | -machine_code |
/MAP | -map |
/NATIONALITY={JAPAN|US} | -nationality {japan|us} |
/OBJECT | None |
/SEQUENCE_CHECK | -sequence_check |
/STANDARD 2 | -std |
/STANDARD=MIA | -std mia |
/TRUNCATE | -trunc |
/WARNINGS | -warn |
/NATIONALITY={JAPAN|US}, -nationality japan
When /NATIONALITY=JAPAN or -nationality japan is specified, the yen sign (¥) is the default currency sign and symbol, and Japanese Language Support features are enabled. Also, in this case /NODIAGNOSTICS and /NOANALYSIS_DATA are specified implicitly.
Oracle CDD/Repository is not supported when /NATIONALITY=JAPAN is used.
When /NATIONALITY=US or -nationality us is specified on the compile command line, the dollar sign ($) is the default currency sign and symbol, and Japanese Language Support features are disabled.
If /STANDARD=MIA or -std mia are present on the compile command line, the compiler will issue informational diagnostics for those language elements that do not conform to the MIA specifications:
To receive the diagnostics, the -warn all flag, /WARNINGS=ALL qualifier, -warn information flag, or /WARNING=INFORMATION qualifier is required.
The default is NOMIA.
B.3.2 Alpha-Specific COBOL Qualifiers and Flags
Table B-3 lists the command-line qualifiers and flags for features specific to Compaq COBOL on Alpha and not available on VAX.
OpenVMS Alpha Qualifier | Tru64 UNIX Flag |
---|---|
/ALIGNMENT | -align |
/ARCHITECTURE= keyword | -arch keyword |
/ARITHMETIC=NATIVE | -arithmetic native |
/ARITHMETIC=STANDARD | -arithmetic standard |
No equivalent qualifier | -c |
No equivalent qualifier | -call_shared |
/CHECK=DECIMAL | -check decimal |
/CONVERT=LEADING_BLANKS | -convert leading_blanks |
No equivalent qualifier | -cord |
No equivalent qualifier | -D num |
/DISPLAY_FORMATTED | -display_formatted |
No equivalent qualifier | -feedback file |
/FLOAT=D_FLOAT | No equivalent flag |
/FLOAT=G_FLOAT | No equivalent flag |
/FLOAT=IEEE_FLOAT | No equivalent flag |
/GRANULARITY= keyword | -granularity keyword |
/INCLUDE | -include |
No equivalent qualifier | -K |
No equivalent qualifier | -L |
No equivalent qualifier | -L dir |
No equivalent qualifier | -l string |
/MATH_INTERMEDIATE=CIT3 | -math_intermediate cit3 |
/MATH_INTERMEDIATE=CIT4 | -math_intermediate cit4 |
/MATH_INTERMEDIATE=FLOAT | -math_intermediate float |
No equivalent qualifier | -names as_is |
No equivalent qualifier | -names lowercase |
No equivalent qualifier | -names uppercase |
No equivalent qualifier | -nolocking |
No equivalent qualifier | -non_shared |
/OPTIMIZE=LEVEL= n | -O n |
No equivalent qualifier | -p[ n] |
No equivalent qualifier | -relax_key_checking |
/RESERVED_WORDS=[NO]200X | -rsv [no]200x |
/RESERVED_WORDS=[NO]FOREIGN_EXTENSIONS | -rsv [no]foreign_extensions |
/RESERVED_WORDS=[NO]XOPEN | -rsv [no]xopen |
No equivalent qualifier | -shared |
No equivalent qualifier | -T [ num] |
No equivalent qualifier | -taso |
/TIE | No equivalent flag |
No equivalent qualifier | -tps |
/TUNE= keyword | -tune keyword |
No equivalent qualifier | -V |
No equivalent qualifier | -v |
No equivalent qualifier | -xref , -xref_stdout |
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