[Vm-dev] Suspicious typing in Cog VM

[Levente Uzonyi]

On Wed, 8 Dec 2010, Frank Shearar wrote:

>
> On 2010/12/08 13:14, David T. Lewis wrote:
>> 
>> On Wed, Dec 08, 2010 at 01:57:45PM +0100, Levente Uzonyi wrote:
>>> 
>>> On Wed, 8 Dec 2010, David T. Lewis wrote:
>>> 
>>>> 
>>>> On Wed, Dec 08, 2010 at 11:30:19AM +0300, Aleksej Saushev wrote:
>>>>>
>>>>>   Hello!
>>>>> 
>>>>> Types are inconsistent along the source, does Cog VM work on LP64
>>>>> platforms?
>>>> 
>>>> The README file at the root of the Cog distribution says this:
>>>> 
>>>> The Cogit currently supports only x86 and the floating-point
>>>> primitives and parts of the platform support code depend on SSE2.
>>>> I hope members of the community will attempt to port it, e.g. to
>>>> ARM, PowerPC and x86-64.
>>>> 
>>>> So no, you should not expect it to work on x86-64. But it should
>>>> work if you compile it in 32-bit mode on your x86-64 platform
>>>> (i.e. with "-m32" in the CFLAGS and LDFLAGS).
>>>> 
>>>> However, I have to admit that I have not yet been able to get
>>>> this working on my own 64-bit SuSE Linux box, due to issues
>>>> with libtool on my system. I've been assuming that this is a
>>>> problem with my Linux system, but I cannot say for sure.
>>> 
>>> IIRC this is a problem on all 64-bit linux platforms. The trick is to add
>>> -m32 to CC instead of CFLAGS (CC="gcc -m32").
>> 
>> 
>> Levente,
>> 
>> Thank you! The CC="gcc -m32" trick is exactly what I was looking for,
>> and I can now get a successful build.
>> 
>> Aleksej,
>> 
>> You should be able to do the same thing on FreeBSD, although the
>> specifics of compiling 32-bit programs on 64-bit might be different.
>> 
>> FWIW, the configure command that I used is:
>>
>>    ../platforms/unix/config/configure CC="gcc -m32" CFLAGS="-g -O2 \
>>    -msse2 -D_GNU_SOURCE -DNDEBUG -DITIMER_HEARTBEAT=1 -DNO_VM_PROFILE=1 \
>>    -DCOGMTVM=0 -DDEBUGVM=0" LIBS=-lpthread
>
> I'm getting (on FreeBSD 7.3, gcc 4.2.1) configure failing with "C compiler 
> cannot create executables", and config.log talking of "exit 77".

You have to make sure that your gcc supports the compilation of 32-bit 
binaries. On debian this is achieved by loading the gcc-multilib package.


Levente

>
> frank
>