[Bug 213137] boot2 too large when using gcc-4.6 or later

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213137

            Bug ID: 213137
           Summary: boot2 too large when using gcc-4.6 or later
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: nigoro.dev at gmail.com

Created attachment 175328
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=175328&action=edit
sample patch for sys/boot/i386/boot2/Makefile

If -fasynchronous-unwind-tables is enabled, the size of boot2 is too large.

# gcc46 -Os -Q --help=optimize | grep unwind-tables
  -fasynchronous-unwind-tables          [enabled]
  -funwind-tables                       [disabled]

Steps to Reproduce)
# pkg install gcc46 (or new version that you want)
# cd /usr/src/sys/boot
# CC=gcc46 make

Part of log)
gcc46 -fomit-frame-pointer  -mrtd  -mregparm=3  -DUSE_XREAD  -DUFS1_AND_UFS2 
-DFLAGS=0x80  -DSIOPRT=0x3f8  -DSIOFMT=0x3  -DSIOSPD=9600 
-I/usr/src/sys/boot/i386/boot2/../../common 
-I/usr/src/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 -march=i386 -ffreestanding -mno-mmx -mno-sse  -msoft-float -m32 -g 
-std=gnu99     -Os  -fno-guess-branch-probability  -fno-unit-at-a-time  --param
max-inline-insns-single=100 -mpreferred-stack-boundary=2   -m32  -c sio.S -o
sio.o
ld -static -N --gc-sections -m elf_i386_fbsd -Ttext 0x2000 -o boot2.out
/usr/src/sys/boot/i386/boot2/../btx/lib/crt0.o boot2.o sio.o
objcopy -S -O binary boot2.out boot2.bin
btxld -v -E 0x2000 -f bin -b /usr/src/sys/boot/i386/boot2/../btx/btx/btx -l
boot2.ldr  -o boot2.ld -P 1 boot2.bin
kernel: ver=1.02 size=690 load=9000 entry=9010 map=16M pgctl=1:1
client: fmt=bin size=17a1 text=0 data=0 bss=0 entry=0
output: fmt=bin size=2031 text=200 data=1e31 org=0 entry=0
-561 bytes available
*** Error code 1

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