gawk: Extension API Informational Variables
16.4.13.3 Informational Variables
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The API provides access to several variables that describe whether the
corresponding command-line options were enabled when 'gawk' was invoked.
The variables are:
'do_debug'
This variable is true if 'gawk' was invoked with '--debug' option.
'do_lint'
This variable is true if 'gawk' was invoked with '--lint' option.
'do_mpfr'
This variable is true if 'gawk' was invoked with '--bignum' option.
'do_profile'
This variable is true if 'gawk' was invoked with '--profile'
option.
'do_sandbox'
This variable is true if 'gawk' was invoked with '--sandbox'
option.
'do_traditional'
This variable is true if 'gawk' was invoked with '--traditional'
option.
The value of 'do_lint' can change if 'awk' code modifies the 'LINT'
predefined variable (Built-in Variables). The others should not
change during execution.