Options are passed to a68g either from the file .a68g.rc in the working directory, the environment
variable A68G_OPTIONS, the command-line or from pragmats.
Option precedence is as follows: pragmat options supersede command-line options, command-line options
supersede options in environment variable A68G_OPTIONS, A68G_OPTIONS supersedes options in .a68g.rc.
Listing options, tracing options and -pragmat, -nopragmat, take their effect when they are encountered in
a left-to-right pass of the program text, and can thus be used, for example, to generate a cross
reference for a particular part of the program.
Where numeric arguments are required, suffices k, M or G are allowed for multiplication with 2 ** 10, 2
** 20 or 2 ** 30 respectively.
--apropos | --help | --info[string]
Print info on options if string is omitted, or print info on string otherwise.
--assertions | --no-assertions
Control elaboration of assertions.
--backtrace | --no-backtrace
Control whether a stack backtrace is done in case a runtime-error occurs.
--brackets
Consider [ .. ] and { .. } as being equivalent to ( .. ). Traditional Algol 68 syntax allows ( ..
) to replace [ .. ] in bounds and slices.
--check | --no-run
Check syntax only, the interpreter does not start.
--clock
Report execution time excluding time needed for compilation.
--compile | --no-compile
Switch compilation of units on or off. Compilation omits many of the runtime checks offered by
the interpreter proper. The program is not executed and a shell script is generated combining
source code and its shared library. This shell script can be used as a pseudo-executable.
--debug | --monitor
Start in the monitor. Invoke the monitor in case a runtime-error occurs; the program will pause
in the monitor on the line that contains the error.
--echostring
Echo string to standout.
--executeunit | --xunit
Execute the Algol 68 unit. In this way one-liners can be executed from the command line.
--exit | --
Ignore further options.
--extensive
Generate an extensive listing.
-f | --filestring
Accept string as filename in case it conflicts with shell syntax.
--framenumber
Set the frame stack size to number bytes.
--handlesnumber
Set the handle space size to number bytes.
--heapnumber
Set the heap size to number bytes.
--listing
Generate a concise listing.
--moids
Generate an overview of modes in the listing file.
--object | --no-object
Control the listing of C code in the listing file.
--optimise | --no-optimise
Switch compilation of units on or off. Compilation omits many of the runtime checks offered by
the interpreter proper. This option is equivalent to -O2.
-O | -O0 | -O1 | -O2 | -O3
Switch compilation of units on and pass the option to the back-end C compiler to set the
optimiser level.
--overheadnumber
Set overhead for stack checking.
--pedantic
Equivalent to --warnings --portcheck
--portcheck | --no-portcheck
Enable or disable portability warning messages.
--pragmats | --no-pragmats
Control elaboration of pragmats.
--precisionnumber
Set the precision for LONG LONG modes to number significant digits.
--prelude-listing
Generate a listing of preludes.
--pretty-print
Pretty-print the source file.
--printunit | --punit
Print the value yielded by the Algol 68 unit. In this way one-liners can be executed from the
command line.
--quiet
Suppress all warning messages.
--quote-stropping
Use quote stropping.
--reductions
Print reductions made by the parser.
--rerun
Use compiled code of a previous run.
--run Override the --no-run option.
--scriptstring
Takes string as source file name and skips further option processing so these can be handled by
the script.
--source | --no-source
Control the listing of source lines in the listing file.
--stacknumber
Set the stack size to number bytes.
--statistics
Generate statistics in the listing file.
--strict
Ignores extensions to Algol 68 syntax.
--time-limitnumber
Interrupt the interpreter after number seconds, generating a time limit exceeded error.
--trace | --no-trace
Control tracing of the running program.
--tree | --no-tree
Control listing of the syntax tree in the listing file.
--unused
Generate an overview of unused tags in the listing file.
--upper-stropping
Use upper stropping, which is the default stropping regime.
--verbose
Use verbose mode.
--version
Print the version of the running image of a68g.
--warnings | --no-warnings
Enable warning messages or suppress suppressible warning messages.
--xref | --no-xref
Control generation of a cross-reference in the listing file.
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