problem building cross compiler for powerpc

["VND Zhang ShaoBo" <ShaoBo dot Zhang at alcatel-sbell dot com dot cn>]

Sorry to bother you !  I have a qusetion to ask you about the cross compiler for powerpc.

I want to build a cross compiler in linux for powerpc/vxworks. I download the binutils-2.9.1, gcc-2.95.1,newlib-1.8.2. 
I successful build the cross compiler powerpc-eabi-gcc as following:
1.build the binutils
2.build the gcc-2.95.1 to get powerpc-eabi-gcc
3.build the newlib using powerpc-eabi-gcc
4.rebuild the gcc-2.95.1 to get the powerpc-eabi-gcc

then ,i program test program, but  i met some error when i using the powerpc-eabi-gcc to build the test program 
the error is as following:
powerpc-eabi-gcc  -I/usr/local/src/gnu/newlib-1.8.2/newlib/libc/include -o hello\
hello.c
/usr/local/powerpc/powerpc-eabi/bin/ld: warning: cannot find entry symbol _start; defaulting to 01800074
/tmp/ccD5t0Jf.o: In function `main':
/tmp/ccD5t0Jf.o(.text+0x24): undefined reference to `printf'
collect2: ld returned 1 exit status
make: *** [hello] Error 1

Why have these errors? I don't slove this matter though i do my best. can you give me an advice? thanks!

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