milkline 兄，你在AUR上问的newlib的问题解决没有，我也出现同样的问题？

月魄孤魂

如题。
昨天我用arm-none-eabi-gcc + arm-none-eabi-newlib没有问题，
今天换回arm-elf-gcc + arm-elf-newlib就出问题：
makefile:

CFLAGS = -Wall -Wstrict-prototypes -g -fomit-frame-pointer -ffreestanding \
-static -nostartfiles -I/usr/arm-elf/include -L/usr/arm-elf/lib \
-L/usr/lib/gcc/arm-elf/4.6.0/ -lgcc -lc -lm -lg

CC = arm-elf-gcc
LD = arm-elf-ld
OBJCOPY = arm-elf-objcopy
OBJDUMP = arm-elf-objdump
SIZE = arm-elf-size

all: head.S init.c interrupt.c  main.c
        $(CC) $(CFLAGS) -c -o head.o head.S
        $(CC) $(CFLAGS) -c -o init.o init.c
        $(CC) $(CFLAGS) -c -o interrupt.o interrupt.c
        $(CC) $(CFLAGS) -c -o main.o main.c
        $(CC) $(CFLAGS) -Tdefault.lds -o key_int.elf  head.o init.o interrupt.o main.o
        $(OBJCOPY) -O binary -S key_int.elf key_int.bin
        $(OBJDUMP) -D -m arm  key_int.elf > key_int.dis
        $(SIZE)  key_int.elf
       
clean:
        rm -f   key_int.dis key_int.bin key_int.elf *.o

错误：

**** Build of configuration Default for project key-int ****

make all
arm-elf-gcc -Wall -Wstrict-prototypes -g -fomit-frame-pointer -ffreestanding -static -nostartfiles -I/usr/arm-elf/include -L/usr/arm-elf/lib -L/usr/lib/gcc/arm-elf/4.6.0/ -lgcc -lc -lm -lg -c -o head.o head.S
arm-elf-gcc -Wall -Wstrict-prototypes -g -fomit-frame-pointer -ffreestanding -static -nostartfiles -I/usr/arm-elf/include -L/usr/arm-elf/lib -L/usr/lib/gcc/arm-elf/4.6.0/ -lgcc -lc -lm -lg -c -o init.o init.c
arm-elf-gcc -Wall -Wstrict-prototypes -g -fomit-frame-pointer -ffreestanding -static -nostartfiles -I/usr/arm-elf/include -L/usr/arm-elf/lib -L/usr/lib/gcc/arm-elf/4.6.0/ -lgcc -lc -lm -lg -c -o interrupt.o interrupt.c
arm-elf-gcc -Wall -Wstrict-prototypes -g -fomit-frame-pointer -ffreestanding -static -nostartfiles -I/usr/arm-elf/include -L/usr/arm-elf/lib -L/usr/lib/gcc/arm-elf/4.6.0/ -lgcc -lc -lm -lg -c -o main.o main.c
/usr/arm-elf/lib/libg.a(lib_a-svfprintf.o): In function `_svfprintf_r':
arm-elf-gcc -Wall -Wstrict-prototypes -g -fomit-frame-pointer -ffreestanding -static -nostartfiles -I/usr/arm-elf/include -L/usr/arm-elf/lib -L/usr/lib/gcc/arm-elf/4.6.0/ -lgcc -lc -lm -lg -Tdefault.lds -o key_int.elf  head.o init.o interrupt.o main.o
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdio/../../../../../newlib-1.19.0/newlib/libc/stdio/vfprintf.c:1084: undefined reference to `__ltdf2'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdio/../../../../../newlib-1.19.0/newlib/libc/stdio/vfprintf.c:1544: undefined reference to `__eqdf2'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdio/../../../../../newlib-1.19.0/newlib/libc/stdio/vfprintf.c:1591: undefined reference to `__nedf2'
/usr/arm-elf/lib/libg.a(lib_a-svfprintf.o): In function `cvt':
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdio/../../../../../newlib-1.19.0/newlib/libc/stdio/vfprintf.c:1724: undefined reference to `__eqdf2'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdio/../../../../../newlib-1.19.0/newlib/libc/stdio/vfprintf.c:1720: undefined reference to `__nedf2'
/usr/arm-elf/lib/libg.a(lib_a-dtoa.o): In function `quorem':
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:60: undefined reference to `__udivsi3'
/usr/arm-elf/lib/libg.a(lib_a-dtoa.o): In function `_dtoa_r':
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:282: undefined reference to `__nedf2'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:347: undefined reference to `__floatunsidf'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:356: undefined reference to `__subdf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:356: undefined reference to `__muldf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:356: undefined reference to `__adddf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:356: undefined reference to `__floatsidf'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:356: undefined reference to `__muldf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:356: undefined reference to `__adddf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:358: undefined reference to `__fixdfsi'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:359: undefined reference to `__ltdf2'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:359: undefined reference to `__floatsidf'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:359: undefined reference to `__nedf2'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:364: undefined reference to `__gtdf2'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:562: undefined reference to `__divdf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:562: undefined reference to `__fixdfsi'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:563: undefined reference to `__floatsidf'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:563: undefined reference to `__muldf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:563: undefined reference to `__subdf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:590: undefined reference to `__muldf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:590: undefined reference to `__nedf2'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:590: undefined reference to `__muldf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:590: undefined reference to `__nedf2'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:562: undefined reference to `__divdf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:562: undefined reference to `__fixdfsi'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:563: undefined reference to `__floatsidf'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:563: undefined reference to `__muldf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:563: undefined reference to `__subdf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:575: undefined reference to `__adddf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:576: undefined reference to `__ltdf2'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:576: undefined reference to `__eqdf2'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:556: undefined reference to `__muldf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:556: undefined reference to `__gedf2'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:450: undefined reference to `__divdf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:457: undefined reference to `__muldf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:459: undefined reference to `__divdf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:471: undefined reference to `__ltdf2'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:477: undefined reference to `__muldf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:480: undefined reference to `__floatsidf'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:480: undefined reference to `__muldf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:480: undefined reference to `__adddf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:498: undefined reference to `__divdf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:498: undefined reference to `__subdf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:501: undefined reference to `__fixdfsi'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:502: undefined reference to `__floatsidf'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:502: undefined reference to `__subdf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:504: undefined reference to `__gtdf2'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:506: undefined reference to `__subdf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:506: undefined reference to `__gtdf2'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:506: undefined reference to `__subdf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:506: undefined reference to `__ltdf2'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:510: undefined reference to `__muldf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:511: undefined reference to `__muldf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:501: undefined reference to `__fixdfsi'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:502: undefined reference to `__floatsidf'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:502: undefined reference to `__subdf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:504: undefined reference to `__ltdf2'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:480: undefined reference to `__floatsidf'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:480: undefined reference to `__muldf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:480: undefined reference to `__adddf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:485: undefined reference to `__subdf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:486: undefined reference to `__gtdf2'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:488: undefined reference to `__ltdf2'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:463: undefined reference to `__muldf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:468: undefined reference to `__muldf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:518: undefined reference to `__muldf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:521: undefined reference to `__fixdfsi'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:522: undefined reference to `__floatsidf'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:522: undefined reference to `__subdf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:519: undefined reference to `__muldf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:521: undefined reference to `__fixdfsi'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:522: undefined reference to `__floatsidf'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:522: undefined reference to `__subdf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:526: undefined reference to `__adddf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:526: undefined reference to `__gtdf2'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:528: undefined reference to `__subdf3'
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/dtoa.c:528: undefined reference to `__ltdf2'
/usr/arm-elf/lib/libg.a(lib_a-mprec.o): In function `__ratio':
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/mprec.c:950: undefined reference to `__divdf3'
/usr/arm-elf/lib/libg.a(lib_a-mprec.o): In function `_mprec_log10':
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/stdlib/../../../../../newlib-1.19.0/newlib/libc/stdlib/mprec.c:987: undefined reference to `__muldf3'
/usr/arm-elf/lib/libg.a(lib_a-syscalls.o): In function `_sbrk':
/tmp/yaourt-tmp-chenss/aur-cross-arm-elf-newlib/src/build/arm-elf/newlib/libc/sys/arm/../../../../../../newlib-1.19.0/newlib/libc/sys/arm/syscalls.c:506: undefined reference to `end'
collect2: ld returned 1 exit status
make: *** [all] 错误 1

**** Build Finished ****

lifc

想做嵌入式开发建议自己编译toolchain，可以用现成的环境或者脚本，例如openwrt、scratchbox或crosstool、crosstool-ng。推荐crosstool-ng，支持最新的gcc、binutils和uclibc、eglibc版本。
arch自带的包局限性比较大（编译器、库支持单一，版本相对陈旧），且用户基础小出问题往往不能及时发现、修改。

月魄孤魂

crosstool-ng 用过，但不成功。
makepkg也是一种构建工具嘛，这是Arch的优点。
个人觉得PKGBUILD要比crosstool-ng等的要先进。
PKGBUILD熟悉点，改起来也方便点。

lifc

Post by 月魄孤魂;2153413
crosstool-ng 用过，但不成功。
makepkg也是一种构建工具嘛，这是Arch的优点。
个人觉得PKGBUILD要比crosstool-ng等的要先进。
PKGBUILD熟悉点，改起来也方便点。

crosstool-ng等构建脚本的优势是傻瓜化，比如选择一个gcc/clib版本组合，它会自动帮你下载并应用相关补丁。
比如你的链接错误（软浮点相关），crosstool-ng/openwrt分别提供了相应的补丁，印象中是修改gcc/config/arm/目录的某个配置脚本，现在我在外地没办法确认。
从理论上说PKGBUILD也可以实现crosstool的功能，前提是要对build的每个细节和每个bug都了如指掌，知道什么时候用哪些技巧、补丁才能通过编译并得到可用的toolchain。

axlrose

楼上说的对，每个过程都了如指掌才搞得定，还有就是一些补丁都是crosstool-ng做好的，直接用，或者openembedded生成toolchain，只不过编译很占空间
之前用crosstoool-ng 生成了amd64下ARM的编译器，还挺好用的
然后把编译好的包通过PKGBUILD打包就可以给其他ARCH机器用了，很方便

milkline

我最后选择的也是crosstool-ng，这个确实比较傻瓜，PKGBUILD里面我全都没搞定，也查不出问题出在哪，在AUR里面问，也没有答案。

月魄孤魂

嗯，我又换回arm-none-eabi-gcc 的了，这个就没有问题。
等以后有需要再用crosstool-ng了。

不知能不能在PKGBUILD中使用crosstool-ng，这样就既用到crosstool-ng的专业，又能用到makepkg的便利了。
晚上再来研究下……

milkline

Post by 月魄孤魂;2153445
嗯，我又换回arm-none-eabi-gcc 的了，这个就没有问题。
等以后有需要再用crosstool-ng了。

不知能不能在PKGBUILD中使用crosstool-ng，这样就既用到crosstool-ng的专业，又能用到makepkg的便利了。
晚上再来研究下……

应该是不能，CT-ng里面有很多东西是要手动选的，除非你可以在PKGBUILD里面生成ct-ng的config文件，但也是要根据不同情况来做的。其实如果手动配置过kernel的话，给ct-ng配置起来也不困难的。

lifc

Post by 月魄孤魂;2153445
嗯，我又换回arm-none-eabi-gcc 的了，这个就没有问题。
等以后有需要再用crosstool-ng了。

不知能不能在PKGBUILD中使用crosstool-ng，这样就既用到crosstool-ng的专业，又能用到makepkg的便利了。
晚上再来研究下……

crosstool-ng也用类似kernel的menuconfig配置框架，配置文件写入工作目录.config。想从PKGBUILD改.config配置，可以用perl/sed等工具写脚本替换其中配置变量，然后调用crosstool-ng编译命令，再用makepkg的机制来打包目标目录（也是配置变量）。
不过crosstool-ng编译较慢（每次编译相当于make clean all，生成大量临时文件），且生成toolchain又在一个固定位置，不会向文件系统多个位置写入，用makepkg来管理似乎没什么优势。
如果对crosstool-ng熟悉，可从配置菜单打开记录编译中间状态选项（先激活EXPERIMENTAL），然后修改状态目录下的环境变量压缩包（是否压缩也是可选项），或直接改build目录下的某个源码（如gcc）后直接编译对应目录（我们调试go语言编译器就用这种方法，避免每次源码改动重新编译全整个crosstool-ng，c/c++外的语言支持也是配置选项，不过crosstool-ng对fortran以外语言支持不完善，要手动改脚本打补丁）。

月魄孤魂

多谢诸位，受教。
暂时将精力转到newlib的syscall上。

大伙能说下syscall就好了，目前还有几团云。