Re: Cross gcc for MIPS

[Kai Ruottu <karuottu at freenet dot hut dot fi>]

"Frank W. Miller" wrote:
> 
> >  Please explain what you mean by '--target=mips'...
> 
> When I configure with this target, I end up with something like
> mips-elf-elf.  I'm putting together a toolchain to port a new OS to
> the Casio Cassiopeia E-100 which has a VR4121 in it so perhaps I'll
> change to the mips64vr4100-elf target you mention below.
> 
> >  My opinion is that configure shouldn't approve target names like
> > 'mips', 'i386', 'powerpc', 'sparc', 'm68k' etc. without any info
> > about the used binary format or operating system.
> I'm sorry, but along this same line, it would be nice if the configure
> had a --targets option or something that would give a nice list of all
> the possible targets it does support?

 Yes, it would be better, but just browsing the 'configure' script in
GCC sources (e.g. 'gcc-2.95.2/gcc/configure') and looking at the target
entries there and seeing what files it will use from the 'config/mips'
directory, would be recommended. It is quite common that there are bugs,
e.g. the 'mips-sni-sysv4*' config entry used to list a file 'sni-gdb.h'
which didn't exist, but there was a 'sni-gas.h'...

 If you use the official FSF sources, you will find the
'mips64vr4100-elf'
target not being supported. The egcs-snapshots may have it and the other
NEC types like 'mips64vr4300-elf' and 'mips64vr5000-elf' now, but at
least
the eCos-1.2.1 devtools sources has them. Or you could try the
'mips64orion-elf' (was this the 'R4650' ? -- just too many types...)

 I copied the 'mips64vr*' configuration entries and the config files to
gcc-2.95.2 sources and the stuff seemed to work there too. The
eCos-1.2.1
GCC is version '2.9-990319', so there weren't a big jump to '2.95.2'.
Jobs like this needs a basic know-how about the config-chain, starting
from the entry in 'gcc/configure' and ending to the files in
'gcc/config/<cpu>'. And a basic knowledge about C and how to fix the
possibly changed macros... I'm not sure if I needed to change anything.

E:\usr\local\samples>gcc-mips64vr4100 -v
Reading specs from
e:\usr\local\lib\gcc-lib\mips64vr4100-elf\2_95.2\specs
gcc version 2.95.2 19991024 (release)

 Building a reference compiler from the '2.9-990321' sources is however
strongly recommended...

 You will not have problems with binutils (just try the snapshots if the
2.9.1 or the 2.9-990321 ones don't work...) or GDB (please try the GDB
or Insight snapshots...). 'ftp://sourceware.cygnus.com/pub/....'

 With all the MIPS targets using the '--with-gnu-as' and '--with-gnu-ld'
may be necessary to avoid all problems with 'mips-tfile' etc.

 BTW, is the 'Casio Cassiopeia E-100' a PDA or what ? 

Cheers, Kai



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