This function is plenty of ifdefs providing implementations for Linux, *BSD and OS-X. However, if we are being build for any other architecture, all that's left behind by preprocessor is just a error reporting call and return of -1. In that case, passed arguments are unused: ../../src/util/virhostcpu.c: In function 'virHostCPUGetInfo': ../../src/util/virhostcpu.c:966:33: error: unused parameter 'cpus' [-Werror=unused-parameter] unsigned int *cpus, ^~~~ Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com&gt; --- src/util/virhostcpu.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/src/util/virhostcpu.c b/src/util/virhostcpu.c index 00c09cd..a481be0 100644 --- a/src/util/virhostcpu.c +++ b/src/util/virhostcpu.c @@ -963,12 +963,12 @@ virHostCPUParseMapLinux(int max_cpuid, const char *path) int virHostCPUGetInfo(virArch hostarch ATTRIBUTE_UNUSED, - unsigned int *cpus, - unsigned int *mhz, - unsigned int *nodes, - unsigned int *sockets, - unsigned int *cores, - unsigned int *threads) + unsigned int *cpus ATTRIBUTE_UNUSED, + unsigned int *mhz ATTRIBUTE_UNUSED, + unsigned int *nodes ATTRIBUTE_UNUSED, + unsigned int *sockets ATTRIBUTE_UNUSED, + unsigned int *cores ATTRIBUTE_UNUSED, + unsigned int *threads ATTRIBUTE_UNUSED) { #ifdef __linux__ int ret = -1; -- 2.8.4