Re: Trouble Building cross m68k-elf

[Kai Ruottu <kai dot ruottu at wippies dot com>]

19.5.2014 17:53, Ken Mandelberg kirjoitti:
> Thanks, I was looking at the wrong log. The right log shows
>
> configure:3374: /big/objdir/./gcc/xgcc -B/big/objdir/./gcc/ 
> -B/usr/local/m68k-elf/bin/ -B/usr/local/m68k-elf/lib/ -isystem 
> /usr/local/m68k-elf/include -isystem /usr/local/m68k-elf/sys-include 
> -o conftest -g -O2   conftest.c >&5
> /big/objdir/./gcc/as: 87: exec: -mcpu=68020: not found
>
> So two questions
>
> 1) Am I missing something about the 68020? Did I need to build 
> something else first?

The 'm68k-elf-as' for the 'm68k-elf' target should accept switches like :

680X0 options:
-l                      use 1 word for refs to undefined symbols [default 2]
-m68000 | -m68008 | -m68010 | -m68020 | -m68030 | -m68040 | -m68060
 | -m68302 | -m68331 | -m68332 | -m68333 | -m68340 | -m68360 | -mcpu32
 | -m5200 | -m5202 | -m5203 | -m5204 | -m5206 | -m5206e | -m5307 | -m5400
                        specify variant of 680X0 architecture [default 
68020]
-m68881 | -m68882 | -mno-68881 | -mno-68882
                        target has/lacks floating-point coprocessor
                        [default yes for 68020, 68030, and cpu32]
-m68851 | -mno-68851
                        target has/lacks memory-management unit coprocessor
                        [default yes for 68020 and up]

The '-mcpu=68020' looks like a switch given to 'm68k-elf-gcc'...

The earlier logfile seems to tell your newbie-mistake :

configure:11134: checking for as
configure:11167: result: no
configure:11245: checking for m68k-elf-as
configure:11275: result: no

 So the answer to your second question is that of course you must first 
build GNU
binutils, including 'as', which will understand the m68k architecture, 
not only
the host x86_64 CPU architecture!

The configure command for GNU binutils would be like :

../binutils-2.14/configure --target=m68k-elf

if you choose to not define your own install prefix via 
'--prefix=$prefix', to use support
for national language error messages, no '--disable-nls' (bare english 
messages) etc
The default install $prefix is '/usr/local',  I myself use 
'--prefix=/opt/cross' for cross GCCs...