On Sun, Apr 16, 2017 at 09:20:50AM +0800, kbuild test robot wrote: > Hi Josh, > > FYI, the error/warning still remains. > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git > master > head: d5ff0814fda50f0306e102f39640cf5bb76af08e > commit: 3f135e57a4f76d24ae8d8a490314331f0ced40c5 x86/build: Mostly disable > '-maccumulate-outgoing-args' > date: 2 weeks ago > config: x86_64-randconfig-s1-04160822 (attached as .config) > compiler: gcc-4.4 (Debian 4.4.7-8) 4.4.7 > reproduce: > git checkout 3f135e57a4f76d24ae8d8a490314331f0ced40c5 > # save the attached .config to linux build tree > make ARCH=x86_64 > > All errors (new ones prefixed by >>): > > >> arch/x86//kernel/ftrace.c:35:3: error: #error The following combination is > >> not supported: ((compiler missing -mfentry) || (CONFIG_X86_32 and > >> !CONFIG_DYNAMIC_FTRACE)) && CONFIG_FUNCTION_GRAPH_TRACER && > >> CONFIG_CC_OPTIMIZE_FOR_SIZE
Hi Fengguang, The error is working as designed. gcc < 4.6.0 doesn't have -mfentry, so it fails the above check on x86. Can you add a skip rule? It should skip building the following case: x86 && ((gcc < 4.6.0) || (CONFIG_X86_32 and !CONFIG_DYNAMIC_FTRACE)) && CONFIG_FUNCTION_GRAPH_TRACER && CONFIG_CC_OPTIMIZE_FOR_SIZE -- Josh
