RULE-5-4: Ignore macros defined on different compilation paths

[lcartey]

Affected rules

• RULE-5-4

Description

Macros defined on different compilation paths do not fall afoul of this rule - the first macro must be defined in the same compilation to trigger the rule. We should consider:

• Conditional includes
• Conditional macro assignment e.g. macros defined in different branches of a #ifdef/#elsif.
• Macros defined inside an #ifndef <MACRO_NAME> check for the same name.

Example

#ifdef FOO
#define X 1 // COMPLIANT
#else
#define X 2 // COMPLIANT
#endif