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If the autoconf/ifdef system ends up taking the trivial branch through all the Arm-architecture ifdefs, then we define the always-fail version of getauxval as a 'static inline' function, and then (because none of our desired HWCAP_FOO values is defined at all) never call it. This leads to a compiler warning because we defined a static function and never called it - i.e. at the default -Werror, a build failure. Of course it's perfectly sensible to define a static inline function that never gets called! Header files do it all the time, and nobody is expected to ensure that if they include a header file then they take care to refer to every static inline function it defines. But if the definition is in the _source_ file rather than a header file, then clang (in particular on macOS) will give a warning. So the easy solution is to move the inline definitions of getauxval into a header file, which suppresses the warning without requiring me to faff about with further ifdefs to make the definitions conditional on at least one use.