On Thu, May 10, 2018 at 03:16:55PM +1000, Nicholas Piggin wrote: > The 64-bit toolchain uses the wrong ISA variant for compiling 32-bit > kernels, eve with -m32. Set -mcpu=powerpc which is the generic 32-bit > powerpc machine type and scheduling model. 32-bit platforms and CPUs > can override this with -mcpu= options that come later on the command > line. > > This fixes a lot of build failures due to incompatible assembly when > compiling 32-bit kernel with 64-bit toolchain. So what ISA is set for gas without this patch? With what GCC version? And, why is that wrong? Segher > +ifdef CONFIG_PPC32 > +# These options will be overridden by any -mcpu option that comes > +# later on the command line, but they are needed to set a sane > +# 32-bit cpu target for the 64-bit cross compiler. > +KBUILD_CFLAGS += -mcpu=powerpc > +KBUILD_AFLAGS += -mcpu=powerpc > +endif -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
