xen-4.8.0-7 compile error

gcc -m64 -DBUILD_ID -fno-strict-aliasing -std=gnu99 -Wall -Wstrict-prototypes -Wdeclaration-after-statement -Wno-unused-but-set-variable -Wno-unused-local-typedefs   -O2 -fomit-frame-pointer -nostdinc -fno-builtin -fno-common -Werror -Wredundant-decls -Wno-pointer-arith -pipe -g -D__XEN__ -include /home/aron/build/xen-4.8.0-7/xen/src/xen-4.8.0/xen/include/xen/config.h '-D__OBJECT_FILE__="compat.o"' -Wa,--strip-local-absolute -MMD -MF ./.compat.o.d -I/home/aron/build/xen-4.8.0-7/xen/src/xen-4.8.0/xen/include -I/home/aron/build/xen-4.8.0-7/xen/src/xen-4.8.0/xen/include/asm-x86/mach-generic -I/home/aron/build/xen-4.8.0-7/xen/src/xen-4.8.0/xen/include/asm-x86/mach-default '-D__OBJECT_LABEL__=arch$x86$efi$compat.o' -msoft-float -fno-stack-protector -fno-exceptions -Wnested-externs -DHAVE_GAS_VMX -DHAVE_GAS_SSE4_2 -DHAVE_GAS_EPT -DHAVE_GAS_FSGSBASE -U__OBJECT_LABEL__ -DHAVE_GAS_QUOTED_SYM '-D__OBJECT_LABEL__=arch/x86/efi/compat.o' -mno-red-zone -mno-sse -fpic -fno-asynchronous-unwind-tables -DGCC_HAS_VISIBILITY_ATTRIBUTE -fshort-wchar -c compat.c -o compat.o
In file included from /home/aron/build/xen-4.8.0-7/xen/src/xen-4.8.0/xen/include/asm/uaccess.h:12:0,
                 from /home/aron/build/xen-4.8.0-7/xen/src/xen-4.8.0/xen/include/asm/guest_access.h:10,
                 from /home/aron/build/xen-4.8.0-7/xen/src/xen-4.8.0/xen/include/xen/guest_access.h:10,
                 from compat.c:1:
runtime.c: In function 'efi_compat_get_info':
/home/aron/build/xen-4.8.0-7/xen/src/xen-4.8.0/xen/include/asm/x86_64/uaccess.h:58:37: error: '*' in boolean context, suggest '&&' instead [-Werror=int-in-bool-context]
      compat_access_ok(addr, (count) * (size)))
                                     ^
/home/aron/build/xen-4.8.0-7/xen/src/xen-4.8.0/xen/include/asm/x86_64/uaccess.h:48:22: note: in definition of macro '__compat_addr_ok'
     ((unsigned long)(addr) < HYPERVISOR_COMPAT_VIRT_START(d))
                      ^~~~
/home/aron/build/xen-4.8.0-7/xen/src/xen-4.8.0/xen/include/asm/x86_64/uaccess.h:54:5: note: in expansion of macro '__compat_access_ok'
     __compat_access_ok(current->domain, addr, size)
     ^~~~~~~~~~~~~~~~~~
/home/aron/build/xen-4.8.0-7/xen/src/xen-4.8.0/xen/include/asm/x86_64/uaccess.h:58:6: note: in expansion of macro 'compat_access_ok'
      compat_access_ok(addr, (count) * (size)))
      ^~~~~~~~~~~~~~~~
/home/aron/build/xen-4.8.0-7/xen/src/xen-4.8.0/xen/include/xen/compat.h:98:5: note: in expansion of macro 'compat_array_access_ok'
     compat_array_access_ok((void *)(full_ptr_t)(hnd).c, (nr),        \
     ^~~~~~~~~~~~~~~~~~~~~~
compat.c:19:27: note: in expansion of macro 'compat_handle_okay'
 #define guest_handle_okay compat_handle_okay
                           ^~~~~~~~~~~~~~~~~~
runtime.c:221:15: note: in expansion of macro 'guest_handle_okay'
         if ( !guest_handle_okay(guest_handle_cast(info->vendor.name,
               ^~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
make[4]: *** [/home/aron/build/xen-4.8.0-7/xen/src/xen-4.8.0/xen/Rules.mk:178: compat.o] Error 1
make[4]: Leaving directory '/home/aron/build/xen-4.8.0-7/xen/src/xen-4.8.0/xen/arch/x86/efi'
make[3]: *** [/home/aron/build/xen-4.8.0-7/xen/src/xen-4.8.0/xen/Rules.mk:166: /home/aron/build/xen-4.8.0-7/xen/src/xen-4.8.0/xen/arch/x86/efi/built_in.o] Error 2
make[3]: Leaving directory '/home/aron/build/xen-4.8.0-7/xen/src/xen-4.8.0/xen/arch/x86'
make[2]: *** [Makefile:143: /home/aron/build/xen-4.8.0-7/xen/src/xen-4.8.0/xen/xen] Error 2
make[2]: Leaving directory '/home/aron/build/xen-4.8.0-7/xen/src/xen-4.8.0/xen'
make[1]: *** [Makefile:46: install] Error 2
make[1]: Leaving directory '/home/aron/build/xen-4.8.0-7/xen/src/xen-4.8.0/xen'
make: *** [Makefile:97: install-xen] Error 2
==> ERROR: A failure occurred in build().
    Aborting...