How to avoid unused variable warning in c?
- Do not give the variable a name (C++) void foo(int /*bar*/) {
- Tell your compiler using a compiler specific nonstandard mechanism. See individual answers for __attribute__((unused)) , various #pragma s and so on.
- Switch the warning off.
- Add a cast to void.
How do I get rid of unused variable warning?
You can simply disable the warning with -Wno-unused-variable.
What is unused parameter?
Unused parameters may signify a bug in the code (e.g. when a different parameter is used instead). The check is similar to the -Wunused-parameter compiler diagnostic and can be used to prepare a codebase to enabling of that diagnostic. By default the check is more permissive (see StrictMode ).
What does unused variable mean in C++?
You can use __unused to tell the compiler that variable might not be used.
How do I stop unused function warning?
To suppress this warning use the unused attribute (see Variable Attributes). Warn whenever a function parameter is unused aside from its declaration. To suppress this warning use the unused attribute (see Variable Attributes). To suppress this warning use the unused attribute (see Variable Attributes).
What is unused C?
9.66 __attribute__((unused)) variable attribute Normally, the compiler warns if a variable is declared but is never referenced. This attribute informs the compiler that you expect a variable to be unused and tells it not to issue a warning if it is not used.
What is Q_unused?
# define Q_UNUSED(x) (void)x; To disable unused variable warnings. You can use the variable after this macro without any problem. However, if you pass an expression or something else to the macro and the compiler has to evaluate the expression it may has side effects†.
What does unused mean in C?
__attribute__((unused)) variable attribute Normally, the compiler warns if a variable is declared but is never referenced. This attribute informs the compiler that you expect a variable to be unused and tells it not to issue a warning if it is not used.
What is void variable?
When used as a function return type, the void keyword specifies that the function does not return a value. When used for a function’s parameter list, void specifies that the function takes no parameters. You cannot declare a variable of type void .