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Restriction of the significance of an external name to fewer than 255 characters in the standard (considering each universal character name or extended source character as a single character) is an obsolescent feature that is a concession to existing implementations. As a result, it is not necessary to comply with this restriction as long as the identifiers are unique and the assumptions concerning the number of significant characters are documented.
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Noncompliant Code Example (Source Character Set)
On implementations that support only the minimum requirements for significant characters required by the standard, the following example is non-compliant noncompliant because the first 31 characters of the external identifiers are identical:
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extern int *a_global_symbol_definition_lookup_table; extern int *b_global_symbol_definition_lookup_table; |
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Noncompliant Code Example (Universal Characters)
In the following non-compliant noncompliant code example, both external identifiers consist of four universal characters. Because the first three universal characters of each identifier are identical, both identify the same integer array.
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The LDRA tool suite V 7.6.0 is able to can detect violations of this rule.
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