[metadata]
id = "DCL36-C"
type = "rule"
category = "DCL"
number = 36
title = "Do not declare an identifier with conflicting linkage classifications"
description = """
Linkage can make an identifier declared in different scopes or declared multiple
times within the same scope refer to the same object or function. Identifiers
are classified asexternally linked,internally linked, ornot linked. These three
kinds of linkage have the following characteristics [Kirch-Prinz 2002]:
According to the C Standard, 6.2.2 paragraph 3 [ISO/IEC 9899:2024], linkage is
determined as follows: Use of an identifier (within one translation unit)
classified as both internally and externally linked isundefined behavior. (See
alsoundefined behavior 8.) A translation unit includes the source file together
with its headers and all source files included via the preprocessing
directive#include.
"""
severity = "Medium"
likelihood = "Probable"
priority = "P8"
level = "L2"
cert_version = "2016 Edition (Wiki)"
last_modified = "Oct 29, 2025"
[rules.cert_c.DCL36-C]
enabled = true
[references]
wiki = "https://wiki.sei.cmu.edu/confluence/display/c/DCL36-C.+Do+not+declare+an+identifier+with+conflicting+linkage+classifications"