Re: Problem with mips toolchain under linux x86

[Jeff Johnston <jjohnstn at redhat dot com>]

Manuel,

  You should be configuring for mips-elf.

  Once you reconfigure and rebuild, look in the libgloss/mips 
directory.  There, you'll see a number of .ld scripts representing 
different bsp's (board support packages).  If one matches your board, 
compile as follows:

  mips-elf-gcc -Txxx.ld manu.c

where xxx.ld is one of the linker scripts in libgloss/mips.

The .ld script will bring in crt0.o (which provides the missing _start 
reference) and it will also bring in the correct libraries to link with.
For example, there is nullmon.ld which has the following note in 
Makefile.in.

# nullmon.a , This is what you want if you want crt0 but NO mon services
# Supports GDB sim testing, board bringups, ICE operation.

If none match your board you can try tweaking one of the existing 
scripts to meet your needs.

-- Jeff J.

Manuel Barros Reyes wrote:
> Hi, last week I started to investigate about building  a toolchain
> with mips as the target. Its for a work we are doing in my university.
> I managed to compile gcc 3.4 and binutils 2.15  with the
> "--target=mips" option without problems and then managed to compile
> newlib for the same target (apparently without any problems). However
> when I try to compile a simple "Hello world!" program in C the
> compiler doesn't link with the libraries. GCC returns with the
> following message:
>
> manu@Jaco:~/src$ mips-gcc  manu.c
> /opt/toolchain/bin/../lib/gcc/mips/3.4.3/../../../../mips/bin/ld:
> warning: cannot find entry symbol _start; defaulting to
> 0000000000400040
> /tmp/ccIzcIx2.o(.text+0x14): In function `main':
> : undefined reference to `printf'
> collect2: ld returned 1 exit status
> manu@Jaco:~/src$
>
>
> Please understand that I'm a complete novice in the subject and its
> probable that I'm missing some important detail. What I've done so far
> was with the little bits of information I found around the internet.
> Maybe you also need more details about my current configuration, if so
> just tell me.
>
> Thanks in advance, Manuel.