Re: cannot find entry symbol _start; defaulting to 01800074

[Joćo Cadamuro Junior <cadamuro at lit dot cpdtt dot cefetpr dot br>]

Hi Steve,

> Trying to cross-compile and link a simple "hello world" type program.  Get
> the following warnings & errors:
>
> /export/home/xc/powerpc-eabi/bin/ld: warning: cannot find entry symbol
> _start;
> defaulting to 01800074
> /var/tmp/ccobtGa6.o: In function 'main':
> /var/tmp/ccobtGa6.o(.text+0x70): undefined reference to 'printf'
> /export/home/gnu-source/build-gcc/gcc/libgcc.a(eabi.o)(.got2+0x8): undefined
> reference to '__SDATA_START__'
>   plus 14 more undefined references in eabi-ctors.c and libgcc.a and finally
> a
> collect2: ld returned 1 exit status
>
> Any suggestions or explanations?  I built gcc with newlib as follows:
>

Try to compile your "hello" porogram using:

$ powerpc-eabi-gcc -g -mads --verbose -o hello.elf hello.c

and see the results...

Basically you need a good linker script (see the "ads.ld" linker script that comes
with newlib...)


>
> #host=sparc-sun-solaris2
> #target=powerpc-eabi
> #prefix=/export/home/xc
> #i=$prefix/bin
> #PATH=$i:$prefix:$PATH:/export/home/opt/gnu/bin; export PATH
> #CC=/export/home/opt/gnu/bin/gcc; export CC
>
> #cd build-binutils
> #../binutils-2.11.90.0.1/configure --target=$target --prefix=$prefix -v
> #make all install
>
> #cd /export/home/gnu-source/gcc-2.95.2
> #ln -s ../newlib-1.9.0/newlib newlib
> #ln -s ../newlib-1.9.0/libgloss libgloss
>
> #cd /export/home/gnu-source/build-gcc
> #../gcc-2.95.2/configure --target=$target --prefix=$prefix
> --enable-languages=c -v
> #make all install
>
> #cd /export/home/gnu-source/build-newlib
> #../newlib-1.9.0/configure --target=$target --prefix=$prefix -v
> #make all install
>
>   Reconfigure and install gcc for C,C++, and additional languages
>
> #cd /export/home/gnu-source/build-gcc
> #../gcc-2.95.2/configure --target=$target --prefix=$prefix -v
> #make all install
>
> Regards, Steve Conyers
>
> ------
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Joćo Cadamuro Junior
LIT / CPDTT / CEFET-PR



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