Binutils Build error when the target is arm-linux

[thinke365]

/configure --target=arm-linux, ok
make, shows error

gcc -DHAVE_CONFIG_H -I.  -I. -I. -I../bfd -I./config -I./../include -I./..
-I./../bfd -DLOCALEDIR="\"/tools/cross/share/locale\""  -W -Wall
-Wstrict-prototypes -Wmissing-prototypes -Werror -g -O2 -MT tc-arm.o -MD -MP
-MF .deps/tc-arm.Tpo -c -o tc-arm.o `test -f 'config/tc-arm.c' || echo
'./'`config/tc-arm.c
cc1: warnings being treated as errors
config/tc-arm.c: In function ‘make_mapping_symbol’:
config/tc-arm.c:2489: Warnning：if statement is empty
make[4]: *** [tc-arm.o] Error 1
make[4]: Leaving directory `/root/build/binutils-2.20_cross/gas'
make[3]: *** [all-recursive] Error 1
make[3]: Leaving directory `/root/build/binutils-2.20_cross/gas'
make[2]: *** [all] Error 2
make[2]: Leaving directory `/root/build/binutils-2.20_cross/gas'
make[1]: *** [all-gas] Error 2
make[1]: Leaving directory `/root/build/binutils-2.20_cross'
make: *** [all] Error 2

you can add parenthesis to gas/config/tc-arm.c at line 2488.
This can solve the problem

My build environment is CentOS 5.3.
gcc 4.1.2, kernel version is 2.6.18
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