On Tue, Jun 5, 2018 at 3:52 PM, Guenter Roeck <linux@xxxxxxxxxxxx> wrote: > Hi Arnd, > > when using the ppc64 compiler from kernel.org, I see the following problems > when trying to compile ppc:allnoconfig in v4.14.y or v4.16.y. > > gcc 7.3.0: Compilation of kernel.cpu.o hangs > > The problem goes away if I apply the following two patches (tested with > 4.16.y) > > 17a2f1ced028 cpu/hotplug: Merge cpuhp_bp_states and cpuhp_ap_states > fcb3029a8d89 cpu/hotplug: Fix unused function warning This is probably the same as https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84038 I thought I had included the fix in my builds. > gcc 8.1.0: Compilation of kernel/cpu.o results in the following error > > powerpc64-linux-gcc: error: unrecognized command line option '-mno-spe'; did > you mean '-fno-see'? > powerpc64-linux-gcc: error: unrecognized command line option '-mspe=no'; did > you mean '-misel=no'? > > This problem is also seen with mainline. I've seen it, but couldn't figure out what the right fix is. I ended up commenting out those two lines in my private builds: --- a/arch/powerpc/Makefile +++ b/arch/powerpc/Makefile @@ -215,8 +215,8 @@ KBUILD_CFLAGS += $(call cc-option,-mno-vsx) # No SPE instruction when building kernel # (We use all available options to help semi-broken compilers) -KBUILD_CFLAGS += $(call cc-option,-mno-spe) -KBUILD_CFLAGS += $(call cc-option,-mspe=no) +#KBUILD_CFLAGS += $(call cc-option,-mno-spe) +#KBUILD_CFLAGS += $(call cc-option,-mspe=no) # Enable unit-at-a-time mode when possible. It shrinks the # kernel considerably. I think there were some changes in how cc-option gets evaluated, maybe those rely on something else to be enabled or disabled first? Arnd
