请问一下，怎么调用数学函数就报错如下：
E:\eclipse_projects\led/2440main.c:47: undefined reference to `__divsi3'
E:\eclipse_projects\led/2440main.c:52: undefined reference to `__divsi3'
E:\eclipse_projects\led/2440main.c:52: undefined reference to `__floatsidf'
E:\eclipse_projects\led/2440main.c:52: undefined reference to `__adddf3'
E:\eclipse_projects\led/2440main.c:52: undefined reference to `__fixdfsi'
E:\eclipse_projects\led/2440main.c:56: undefined reference to `__divsi3'
E:\eclipse_projects\led/2440main.c:56: undefined reference to `__floatsidf'
E:\eclipse_projects\led/2440main.c:56: undefined reference to `__adddf3'
E:\eclipse_projects\led/2440main.c:56: undefined reference to `__fixdfsi'

程序如下：
52 行：      rUBRDIV1=( (int)(pclk/16./baud+0.5) -1 );

连接时，加入libgcc.a，似乎是这个

libgcc.a这个文件在什么地方啊，怎么添加啊，我在makefile里添加如下：arm-elf-ld -Tleds.lds  crt0.o my.o leds.o  libgcc.a -o leds_elf，仍报错如下：make all
arm-elf-gcc -Wall -Wstrict-prototypes -g -fomit-frame-pointer -ffreestanding -c -o crt0.o crt0.S
arm-elf-gcc -Wall -Wstrict-prototypes -g -fomit-frame-pointer -ffreestanding -c -o my.o my.c   
arm-elf-gcc -Wall -Wstrict-prototypes -g -fomit-frame-pointer -ffreestanding -c -o leds.o leds.c
arm-elf-ld -Tleds.lds  crt0.o my.o leds.o  libgcc.a -o leds_elf
arm-elf-ld: libgcc.a: No such file: No such file or directory
make: *** [all] Error 1
找不到libgcc.a文件？

你到工具链的目录下去搜libgcc.a，静态链接libgcc.a时要指定绝对路径