busybox编译成arm平台的二进制文件时，需要注意编译器选项。推荐使用codesourcery提供的交叉编译器，它默认提供的-march参数是 armv5te.  而Ubuntu软件包中的交叉编译器默认的march参数是armv7-a.

具体的参数区别如下：

codesourcery：

Using built-in specs.

Target: arm-none-linux-gnueabi

Configured with:

/scratch/julian/2009q3-respin-linux-lite/src/gcc-4.4/configure

--build=i686-pc-linux-gnu

--host=i686-pc-linux-gnu

--target=arm-none-linux-gnueabi

--enable-threads

--disable-libmudflap

--disable-libssp

--disable-libstdcxx-pch

--enable-extra-sgxxlite-multilibs

--with-arch=armv5te

--with-gnu-as

--with-gnu-ld

--with-specs='%{funwind-tables|fno-unwind-tables|mabi=*|ffreestanding|nostdlib:;:-funwind-tables} %{O2:%{!fno-remove-local-statics: -fremove-local-statics}} %{O*:%{O|O0|O1|O2|Os:;:%{!fno-remove-local-statics: -fremove-local-statics}}}'

--enable-languages=c,c++

--enable-shared

--disable-lto

--enable-symvers=gnu

--enable-__cxa_atexit

--with-pkgversion='Sourcery G++ Lite 2009q3-67'

--with-bugurl=https://support.codesourcery.com/GNUToolchain/

--disable-nls

--prefix=/opt/codesourcery

--with-sysroot=/opt/codesourcery/arm-none-linux-gnueabi/libc

--with-build-sysroot=/scratch/julian/2009q3-respin-linux-lite/install/arm-none-linux-gnueabi/libc

--with-gmp=/scratch/julian/2009q3-respin-linux-lite/obj/host-libs-2009q3-67-arm-none-linux-gnueabi-i686-pc-linux-gnu/usr

--with-mpfr=/scratch/julian/2009q3-respin-linux-lite/obj/host-libs-2009q3-67-arm-none-linux-gnueabi-i686-pc-linux-gnu/usr

--with-ppl=/scratch/julian/2009q3-respin-linux-lite/obj/host-libs-2009q3-67-arm-none-linux-gnueabi-i686-pc-linux-gnu/usr

--with-host-libstdcxx='-static-libgcc -Wl,-Bstatic,-lstdc++,-Bdynamic -lm'

--with-cloog=/scratch/julian/2009q3-respin-linux-lite/obj/host-libs-2009q3-67-arm-none-linux-gnueabi-i686-pc-linux-gnu/usr

--disable-libgomp

--enable-poison-system-directories

--with-build-time-tools=/scratch/julian/2009q3-respin-linux-lite/install/arm-none-linux-gnueabi/bin

--with-build-time-tools=/scratch/julian/2009q3-respin-linux-lite/install/arm-none-linux-gnueabi/bin

Thread model: posix

gcc version 4.4.1 (Sourcery G++ Lite 2009q3-67)

COLLECT_GCC_OPTIONS='-v'

'-o'

'aa'

'-march=armv5te'

'-funwind-tables'

/opt/arm-2009q3-none-linux-gnueabi/bin/../libexec/gcc/arm-none-linux-gnueabi/4.4.1/cc1

-quiet

-v

-iprefix

/opt/arm-2009q3-none-linux-gnueabi/bin/../lib/gcc/arm-none-linux-gnueabi/4.4.1/ -isysroot /opt/arm-2009q3-none-linux-gnueabi/bin/../arm-none-linux-gnueabi/libc

aa.c

-quiet

-dumpbase

aa.c

-march=armv5te

-auxbase

aa

-version

-funwind-tables

-o /tmp/cc1pXwY1.s

#include "..." search starts here:

#include <...> search starts here:

/opt/arm-2009q3-none-linux-gnueabi/bin/../lib/gcc/arm-none-linux-gnueabi/4.4.1/include

/opt/arm-2009q3-none-linux-gnueabi/bin/../lib/gcc/arm-none-linux-gnueabi/4.4.1/include-fixed

/opt/arm-2009q3-none-linux-gnueabi/bin/../lib/gcc/arm-none-linux-gnueabi/4.4.1/../../../../arm-none-linux-gnueabi/include

/opt/arm-2009q3-none-linux-gnueabi/bin/../arm-none-linux-gnueabi/libc/usr/include

GNU C (Sourcery G++ Lite 2009q3-67) version 4.4.1 (arm-none-linux-gnueabi)

compiled by GNU C version 4.3.2, GMP version 4.3.1, MPFR version 2.4.1-p5.

GGC heuristics:

--param

ggc-min-expand=100

--param

ggc-min-heapsize=131072

Compiler executable checksum: 74011fea7f66b1cda6b19363b6694363

COLLECT_GCC_OPTIONS='-v'

'-o'

'aa'

'-march=armv5te'

'-funwind-tables'

/opt/arm-2009q3-none-linux-gnueabi/bin/../lib/gcc/arm-none-linux-gnueabi/4.4.1/../../../../arm-none-linux-gnueabi/bin/as

-v

-march=armv5te

-meabi=5

-o

/tmp/cc4FZC9V.o

/tmp/cc1pXwY1.s

GNU assembler version 2.19.51 (arm-none-linux-gnueabi) using BFD version (Sourcery G++ Lite 2009q3-67) 2.19.51.20090709

COMPILER_PATH=/opt/arm-2009q3-none-linux-gnueabi/bin/../libexec/gcc/arm-none-linux-gnueabi/4.4.1/:/opt/arm-2009q3-none-linux-gnueabi/bin/../libexec/gcc/:/opt/arm-2009q3-none-linux-gnueabi/bin/../lib/gcc/arm-none-linux-gnueabi/4.4.1/../../../../arm-none-linux-gnueabi/bin/

LIBRARY_PATH=/opt/arm-2009q3-none-linux-gnueabi/bin/../lib/gcc/arm-none-linux-gnueabi/4.4.1/:/opt/arm-2009q3-none-linux-gnueabi/bin/../lib/gcc/:/opt/arm-2009q3-none-linux-gnueabi/bin/../arm-none-linux-gnueabi/libc/lib/:/opt/arm-2009q3-none-linux-gnueabi/bin/../arm-none-linux-gnueabi/libc/usr/lib/

COLLECT_GCC_OPTIONS='-v'

'-o'

'aa'

'-march=armv5te'

'-funwind-tables'

/opt/arm-2009q3-none-linux-gnueabi/bin/../libexec/gcc/arm-none-linux-gnueabi/4.4.1/collect2

--sysroot=/opt/arm-2009q3-none-linux-gnueabi/bin/../arm-none-linux-gnueabi/libc

--eh-frame-hdr

-dynamic-linker

/lib/ld-linux.so.3

-X

-m

armelf_linux_eabi

-o

aa

/opt/arm-2009q3-none-linux-gnueabi/bin/../arm-none-linux-gnueabi/libc/usr/lib/crt1.o

/opt/arm-2009q3-none-linux-gnueabi/bin/../arm-none-linux-gnueabi/libc/usr/lib/crti.o

/opt/arm-2009q3-none-linux-gnueabi/bin/../lib/gcc/arm-none-linux-gnueabi/4.4.1/crtbegin.o

-L

/opt/arm-2009q3-none-linux-gnueabi/bin/../lib/gcc/arm-none-linux-gnueabi/4.4.1

-L

/opt/arm-2009q3-none-linux-gnueabi/bin/../lib/gcc -L/opt/arm-2009q3-none-linux-gnueabi/bin/../arm-none-linux-gnueabi/libc/lib

-L

/opt/arm-2009q3-none-linux-gnueabi/bin/../arm-none-linux-gnueabi/libc/usr/lib /tmp/cc4FZC9V.o

-lgcc

--as-needed

-lgcc_s

--no-as-needed

-lc

-lgcc

--as-needed

-lgcc_s

--no-as-needed

/opt/arm-2009q3-none-linux-gnueabi/bin/../lib/gcc/arm-none-linux-gnueabi/4.4.1/crtend.o

/opt/arm-2009q3-none-linux-gnueabi/bin/../arm-none-linux-gnueabi/libc/usr/lib/crtn.o

ubuntu cross compiler:

使用内建 specs。

目标：arm-linux-gnueabi

配置为：

../src/configure

-v

--with-pkgversion='Ubuntu/Linaro 4.4.7-1ubuntu2'

--with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs

--enable-languages=c,c++,fortran,objc,obj-c++

--prefix=/usr

--program-suffix=-4.4

--enable-shared

--enable-linker-build-id

--with-system-zlib

--libexecdir=/usr/lib

--without-included-gettext

--enable-threads=posix

--with-gxx-include-dir=/usr/arm-linux-gnueabi/include/c++/4.4.7

--libdir=/usr/lib

--enable-nls

--enable-clocale=gnu

--enable-libstdcxx-debug

--enable-objc-gc

--disable-sjlj-exceptions

--with-arch=armv7-a

--with-float=softfp

--with-fpu=vfpv3-d16

--with-mode=thumb

--disable-werror

--enable-checking=release

--program-prefix=arm-linux-gnueabi-

--includedir=/usr/arm-linux-gnueabi/include

--build=i686-linux-gnu

--host=i686-linux-gnu

--target=arm-linux-gnueabi

--with-headers=/usr/arm-linux-gnueabi/include

--with-libs=/usr/arm-linux-gnueabi/lib

线程模型：posix

gcc 版本 4.4.7 (Ubuntu/Linaro 4.4.7-1ubuntu2)

COLLECT_GCC_OPTIONS='-v'

'-o'

'aa'

'-march=armv7-a'

'-mfloat-abi=softfp'

'-mfpu=vfpv3-d16'

'-mthumb'

/usr/lib/gcc/arm-linux-gnueabi/4.4.7/cc1

-quiet

-v

-imultilib

.

-imultiarch

arm-linux-gnueabi

aa.c

-quiet

-dumpbase

aa.c

-march=armv7-a

-mfloat-abi=softfp

-mfpu=vfpv3-d16

-mthumb

-auxbase

aa

-version

-o

/tmp/ccY8tups.s

/usr/lib/gcc/arm-linux-gnueabi/4.4.7/include

/usr/lib/gcc/arm-linux-gnueabi/4.4.7/include-fixed

/usr/arm-linux-gnueabi/include

GNU C (Ubuntu/Linaro 4.4.7-1ubuntu2) 版本 4.4.7 (arm-linux-gnueabi)

由 GNU C 版本 4.6.3 编译， GMP 版本 5.0.2，MPFR 版本 3.1.0-p3。

GGC 准则：--param ggc-min-expand=100 --param ggc-min-heapsize=131072

Compiler executable checksum: 602bbdb1e12aee29c89a048836b7c94c

COLLECT_GCC_OPTIONS='-v'

'-o'

'aa'

'-march=armv7-a'

'-mfloat-abi=softfp'

'-mfpu=vfpv3-d16' '-mthumb'

/usr/lib/gcc/arm-linux-gnueabi/4.4.7/../../../../arm-linux-gnueabi/bin/as

-march=armv7-a

-mfloat-abi=softfp

-mfpu=vfpv3-d16

-mimplicit-it=thumb

-meabi=5

-o

/tmp/ccSERt9Z.o

/tmp/ccY8tups.s

COMPILER_PATH=/usr/lib/gcc/arm-linux-gnueabi/4.4.7/:/usr/lib/gcc/arm-linux-gnueabi/4.4.7/:/usr/lib/gcc/arm-linux-gnueabi/:/usr/lib/gcc/arm-linux-gnueabi/4.4.7/:/usr/lib/gcc/arm-linux-gnueabi/:/usr/lib/gcc/arm-linux-gnueabi/4.4.7/../../../../arm-linux-gnueabi/bin/

LIBRARY_PATH=/usr/lib/gcc/arm-linux-gnueabi/4.4.7/:/usr/lib/gcc/arm-linux-gnueabi/4.4.7/../../../../arm-linux-gnueabi/lib/

COLLECT_GCC_OPTIONS='-v'

'-o'

'aa'

'-march=armv7-a'

'-mfloat-abi=softfp'

'-mfpu=vfpv3-d16'

'-mthumb'

/usr/lib/gcc/arm-linux-gnueabi/4.4.7/collect2

--build-id

--eh-frame-hdr

-dynamic-linker

/lib/ld-linux.so.3

-X

--hash-style=gnu

-m

armelf_linux_eabi

-o

aa

/usr/lib/gcc/arm-linux-gnueabi/4.4.7/../../../../arm-linux-gnueabi/lib/crt1.o /usr/lib/gcc/arm-linux-gnueabi/4.4.7/../../../../arm-linux-gnueabi/lib/crti.o

/usr/lib/gcc/arm-linux-gnueabi/4.4.7/crtbegin.o

-L

/usr/lib/gcc/arm-linux-gnueabi/4.4.7

-L

/usr/lib/gcc/arm-linux-gnueabi/4.4.7/../../../../arm-linux-gnueabi/lib /tmp/ccSERt9Z.o

-lgcc

--as-needed

-lgcc_s

--no-as-needed

-lc

-lgcc

--as-needed

-lgcc_s

--no-as-needed

/usr/lib/gcc/arm-linux-gnueabi/4.4.7/crtend.o

/usr/lib/gcc/arm-linux-gnueabi/4.4.7/../../../../arm-linux-gnueabi/lib/crtn.o