while building perf with gcc 7.3.0 on linux next this warning/error is found. In file included from libbpf.c:55:0: libbpf.c: In function 'bpf_object__elf_collect': libbpf_internal.h:74:22: error: format '%zu' expects argument of type 'size_t', but argument 5 has type 'Elf64_Xword {aka long long unsigned int}' [-Werror=format=] libbpf_print(level, "libbpf: " fmt, ##__VA_ARGS__); cc1: all warnings being treated as errors OE perf build long link, https://ci.linaro.org/view/lkft/job/openembedded-lkft-linux-next/DISTRO=lkft,MACHINE=am57xx-evm,label=docker-lkft/846/consoleText - Naresh