Why doesn't the GCC give any warning to these unused variables in the Linux kernel?

[Song Zhi <hizhisong@xxxxxxxxxxx>]

Normally, the compiler warns if a variable is declared but is never referenced. In the Linux kernel source code, some unused functions and variables are marked __atrribute__((unused)).

==> https://livegrep.com/search/linux?q=__attribute__((unused))

GCC, on the other hand, does not provide any warnings for these unused and unmarked variables like the integer flags in kernel/sched/idle.c#427 .

Why?

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