tidy - readability-redundant-preprocessor — Extra Clang Tools 22.0.0git documentation (original) (raw)

Finds potentially redundant preprocessor directives. At the moment the following cases are detected:

• #ifdef .. #endif pairs which are nested inside an outer pair with the same condition. For example:

#ifdef FOO #ifdef FOO // inner ifdef is considered redundant void f(); #endif #endif

• Same for #ifndef .. #endif pairs. For example:

#ifndef FOO #ifndef FOO // inner ifndef is considered redundant void f(); #endif #endif

• #ifndef inside an #ifdef with the same condition:

#ifdef FOO #ifndef FOO // inner ifndef is considered redundant void f(); #endif #endif

• #ifdef inside an #ifndef with the same condition:

#ifndef FOO #ifdef FOO // inner ifdef is considered redundant void f(); #endif #endif

• #if .. #endif pairs which are nested inside an outer pair with the same condition. For example:

#define FOO 4 #if FOO == 4 #if FOO == 4 // inner if is considered redundant void f(); #endif #endif