sys/boot/i386/boot2 build failure with clang

Howdy,

Trying to build r224125 with clang, and got this (using no -j):

===> boot2 (all)
objcopy -S -O binary boot1.out boot1
dd if=/dev/zero of=boot2.ldr bs=512 count=1
1+0 records in
1+0 records out
512 bytes transferred in 0.000040 secs (12782641 bytes/sec)
clang -Os  -fno-guess-branch-probability  -fomit-frame-pointer
-fno-unit-at-a-time  -mno-align-long-strings  -mrtd  -mregparm=3
-DUSE_XREAD  -DUFS1_AND_UFS2  -DFLAGS=0x80  -DSIOPRT=0x3f8  -DSIOFMT=0x3
 -DSIOSPD=9600  -I/home/svn/head/sys/boot/i386/boot2/../../common
-I/home/svn/head/sys/boot/i386/boot2/../btx/lib -I.  -Wall
-Waggregate-return -Wbad-function-cast -Wcast-align
-Wmissing-declarations -Wmissing-prototypes -Wnested-externs
-Wpointer-arith -Wshadow -Wstrict-prototypes -Wwrite-strings  -Winline
--param max-inline-insns-single=100 -mllvm -stack-alignment=8 -mllvm
-inline-threshold=3  -mllvm -enable-load-pre=false  -ffreestanding
-mpreferred-stack-boundary=2  -mno-mmx -mno-3dnow -mno-sse -mno-sse2
-mno-sse3 -msoft-float -m32 -march=i386 -g -std=gnu99   -S -o
boot2.s.tmp /home/svn/head/sys/boot/i386/boot2/boot2.c
clang: warning: the clang compiler does not support '-fno-unit-at-a-time'
clang: warning: argument unused during compilation:
'-fno-guess-branch-probability'
clang: warning: argument unused during compilation:
'-mno-align-long-strings'
clang: warning: argument unused during compilation: '--param
max-inline-insns-single=100'
clang: warning: argument unused during compilation:
'-mpreferred-stack-boundary=2'
In file included from /home/svn/head/sys/boot/i386/boot2/boot2.c:172:
/home/svn/head/sys/boot/i386/boot2/../../common/ufsread.c:232:17:
warning: cast
      from 'char *' to 'struct ufs1_dinode *' increases required
alignment from
      1 to 4 [-Wcast-align]
                        memcpy(&dp1, (struct ufs1_dinode *)blkbuf + n,
                                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/svn/head/sys/boot/i386/boot2/../../common/ufsread.c:235:17:
warning: cast
      from 'char *' to 'struct ufs2_dinode *' increases required
alignment from
      1 to 4 [-Wcast-align]
                        memcpy(&dp2, (struct ufs2_dinode *)blkbuf + n,
                                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/svn/head/sys/boot/i386/boot2/boot2.c:224:1: warning: no previous
prototype
      for function 'main' [-Wmissing-prototypes]
main(void)
^
/home/svn/head/sys/boot/i386/boot2/boot2.c:352:4: warning: cast from
'caddr_t'
      (aka 'char *') to 'Elf32_Word *' (aka 'unsigned int *') increases
required
      alignment from 1 to 4 [-Wcast-align]
                *(Elf32_Word *)p = es[i].sh_size;
                 ^~~~~~~~~~~~~~~
/home/svn/head/sys/boot/i386/boot2/boot2.c:611:8: warning: cast from
'caddr_t'
      (aka 'char *') to 'uint32_t *' (aka 'unsigned int *') increases
required
      alignment from 1 to 4 [-Wcast-align]
        t1 = *(uint32_t *)PTOV(0x46c);
              ^~~~~~~~~~~~~~~~~~~~~~~
5 warnings generated.
sed -e '/align/d' -e '/nop/d' < boot2.s.tmp > boot2.s
rm -f boot2.s.tmp
as  --32 -o boot2.o boot2.s
boot2.s: Assembler messages:
boot2.s:4073: Error: unknown pseudo-op: `.cfi_sections'
*** Error code 1




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