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For instance:
Bool NullFunc(const struct timespec *when, const char *who) { return TRUE; } In C++ I was able to put a /*...*/ comment around the parameters. But not in C of course, where it gives me the error:
error: parameter name omitted
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By default, the compiler does not warn about unused variables. Use -Wunused-variable to enable this warning specifically, or use an encompassing -W value such as -Weverything . The __attribute__((unused)) attribute can be used to warn about most unused variables, but suppress warnings for a specific set of variables.
Reports the parameters that are considered unused in the following cases: The parameter is passed by value, and the value is not used anywhere or is overwritten immediately. The parameter is passed by reference, and the reference is not used anywhere or is overwritten immediately.
__attribute__((unused)) function attribute The unused function attribute prevents the compiler from generating warnings if the function is not referenced. This does not change the behavior of the unused function removal process.
To suppress the warning, one can simply name the variable with an underscore ('_') alone. Python treats it as an unused variable and ignores it without giving the warning message.
I usually write a macro like this:
#define UNUSED(x) (void)(x) You can use this macro for all your unused parameters. (Note that this works on any compiler.)
For example:
void f(int x) { UNUSED(x); ... } If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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