(new top-level subthread here since this is a separate topic): On Mon, May 22, 2017 at 5:41 PM, Palmer Dabbelt <[email protected]> wrote:
> diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile > new file mode 100644 > index 000000000000..07ef200e0675 > --- /dev/null > +++ b/arch/riscv/Makefile > @@ -0,0 +1,64 @@ > +# This file is included by the global makefile so that you can add your own > +# architecture-specific flags and dependencies. Remember to do have actions > +# for "archclean" and "archdep" for cleaning up and making dependencies for > +# this architecture > +# > +# This file is subject to the terms and conditions of the GNU General Public > +# License. See the file "COPYING" in the main directory of this archive > +# for more details. > +# > + > +LDFLAGS := > +OBJCOPYFLAGS := -O binary > +LDFLAGS_vmlinux := > +KBUILD_AFLAGS_MODULE += -fPIC > +KBUILD_CFLAGS_MODULE += -fPIC > + > +ifeq ($(ARCH),riscv) > + KBUILD_DEFCONFIG = riscv64_spike > +else > + KBUILD_DEFCONFIG = $(ARCH)_spike > +endif > + > +export BITS > +ifeq ($(CONFIG_64BIT),y) > + BITS := 64 > + UTS_MACHINE := riscv64 > + > + KBUILD_CFLAGS += -mabi=lp64 > + KBUILD_AFLAGS += -mabi=lp64 > + KBUILD_MARCH = rv64im > + LDFLAGS += -melf64lriscv > +else > + BITS := 32 > + UTS_MACHINE := riscv32 > + > + KBUILD_CFLAGS += -mabi=ilp32 > + KBUILD_AFLAGS += -mabi=ilp32 > + KBUILD_MARCH = rv32im > + LDFLAGS += -melf32lriscv > +endif > + > +ifeq ($(CONFIG_RV_ATOMIC),y) > + KBUILD_RV_ATOMIC = a > +endif > + > +KBUILD_CFLAGS += -Wall > + > +ifeq ($(CONFIG_RVC),y) > + KBUILD_RVC = c > +endif > + > +KBUILD_AFLAGS += -march=$(KBUILD_MARCH)$(KBUILD_RV_ATOMIC)fd$(KBUILD_RVC) > + > +KBUILD_CFLAGS += -march=$(KBUILD_MARCH)$(KBUILD_RV_ATOMIC)$(KBUILD_RVC) > +KBUILD_CFLAGS += -mno-save-restore > +KBUILD_CFLAGS += -mstrict-align I built a vanilla gcc-7.1.0 here, with 'riscv64-linux' as target, and I get: riscv64-linux-gcc: error: unrecognized command line option '-mstrict-align'; did you mean '-Wstrict-aliasing'? The suggestion seems completely bogus, but the error is real. Looking at the gcc sources, I only see strict-align plumbed up on rs6000, aarch64, m68k(!) and v850. Or am I missing something here? -Olof
