BSL259 — Unknown preprocessor symbol

← All rules

Summary

Unknown preprocessor symbol

Identifiers

Field	Value
Rule code	BSL259
Compatible alias	UnknownPreprocessorSymbol
Severity	WARNING
Enabled by default	Yes
Implemented	Yes
Tags	correctness, directive

Behavior

• The public identifier BSL259 and alias UnknownPreprocessorSymbol are stable.
• The rule reports the cases documented on this page.
• Suppressions and project configuration are applied before publication.
• The rule requires neither an external analyzer nor network access.

Configuration and suppression

BSL### is the primary stable identifier. The compatible alias is accepted in select, ignore, and compatible block suppression comments.

[tool.onec-hbk-bsl]
select = ["BSL259"]
ignore = ["UnknownPreprocessorSymbol"]

All three suppression families support both a current line and a range. When an opening comment follows code, it affects only that line. Use any one form:

• noqa:

Value = "example";  // noqa: BSL259

• bsl-disable:

Value = "example";  // bsl-disable: BSL259

• compatible BSLLS form:

Value = "example";  // BSLLS:UnknownPreprocessorSymbol-off

When the same opening comment is on a line by itself, it starts a range. Close it with the matching marker from the same family:

// noqa: BSL259
// code without this diagnostic
// noqa-enable: BSL259

// bsl-disable: BSL259
// code without this diagnostic
// bsl-enable: BSL259

// BSLLS:UnknownPreprocessorSymbol-off
// code without this diagnostic
// BSLLS:UnknownPreprocessorSymbol-on

To disable the rule until the end of the file, omit the closing noqa-enable, bsl-enable, or BSLLS:…-on marker.

Opening and closing markers must belong to the same family.

Description

The use of unknown preprocessor symbols is unacceptable, this can lead to various errors, including logical ones, when, for some reason, the platform will miss an error by simply ignoring the written code.