binutils and newlib for powerpc-ibm-eabi with gcc-2.95.2

[David Korn]

>ls
>CVS              build-binutils  gcc-2.95.2    newlib-cvs
>binutils-2.10.1  build-gcc       newlib-1.9.0

  Oops, no build-newlib.

>cd build-binutils
>../binutils-2.10.1/configure --prefix=/export/usr
>--target=powerpc-ibm-eabi
>make
>make install

>ln -s ../newlib-cvs/newlib newlib

>../gcc-2.95.2/configure --prefix=/export/usr --target=powerpc-ibm-eabi
>--enable-languages="c" --with-gnu-as --with-gnu-ld --with-newlib
>make
>make install

>Now, if I try to compile a 'plain' C program with no library calls in it
>everything works (apparently), but if I include any library calls the
>compilation fails at link time.

  Well, you haven't built and installed newlib yet.  It doesn't get done
by the gcc build; that just needs the headers for building the cross libgcc,
which doesn't contain the libc functions.

>/export/usr/powerpc-ibm-eabi/bin/ld: warning: cannot find entry symbol
>_start; defaulting to 01800074

  Oops, no startup crt.o file.  That's part of newlib too.

>In function `__do_global_ctors':
>/export/sources/build-gcc/gcc/eabi-ctors.c(.sdata+0x4): undefined
>reference to `__fini'
>collect2: ld returned 1 exit status
>
>Something I find odd is that in the final error the linker is looking in
>the source tree rather than in the built code, is this right?

  Yep, because the undefined references are all coming from modules in 
libgcc.a:

>/export/usr/lib/gcc-lib/powerpc-ibm-eabi/2.95.2/libgcc.a(eabi.o)(.got2+
>0x50):undefined reference to `__EXCEPT_END__'
>/export/usr/lib/gcc-lib/powerpc-ibm-eabi/2.95.2/libgcc.a(eabi-ctors.o)
>(.sdata+0x0):undefined reference to `__init'

 so the error message points at the source code that libgcc was compiled
from.  This is probably made possible because gcc builds with -g in the
flags by default.

>So... if I do the following to reduce the error I get these errors,
>
>powerpc-ibm-eabi-gcc -e main -mno-eabi -mcpu=823 helloworld.c
>
>/tmp/ccXU84tt.o: In function `main':
>/tmp/ccXU84tt.o(.text+0x1c): undefined reference to `printf'
>collect2: ld returned 1 exit status
>
>This appears to be the linker not knowing where printf is, or more
>specifically libc.a, so I try the following
>
>powerpc-ibm-eabi-gcc -e main -mno-eabi -mcpu=823 
>-L/export/usr/powerpc-ibm-eabi/lib/ helloworld.c
>
>and get the same error.

  Did you stop and look if there was a libc.a actually in that dir?

>
>Has anyone here been able to use gcc with binutils and newlib to create
>a cross compiler suite of tools for the powerpc-ibm-eabi target (i.e. a
>powerpc as a bare chip with no OS, i.e. Linux on it).  Is there
>something I'm missing in the build process?

  cd build-newlib; 
  ../newlib-1.9.0/configure --prefix=/export/usr --target=powerpc-ibm-eabi
  make
  make install

might help.

           DaveK


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