Rule 5.1 and case-sensitive

[misra-c]

The definition of the word "distinct" in rule 5.1 depends on the implementation in which the code is being compiled/linked.
What is considered non-compliant with this rule will depend on the implementation under which the code is being developed, not the implementation of the analysis tool.

The first example in the document (engine_exhaust_gas_temperature_raw) assumes an implementation which supports:

• 31 significant characters
  
• case-sensitive

The second example (abc) assumes an implementation which supports:

• 6 significant characters
  
• case-INsensitive

Because this implementation is case-insensitive, the linker may treat "abc" and "ABC" as the same identifier. Therefore this is non-compliant with rule 5.1.

"abc" v "ABC" would be compliant with rule 5.1 if the implementation treated external identifiers as being case-sensitive.

Note: "abc" and "ABC" will always be non-compliant with directive 4.5.