[Etoys] A new experimental version of OLPC image for non-XO environments

[Bert Freudenberg]

On Feb 28, 2008, at 9:03 , Yoshiki Ohshima wrote:

>> Uh-oh! FC6's gcc introduced a new hash by default in FC6 which  
>> results in FP
>> exception on older FC and other linux distributions. If you cannot  
>> avoid
>> FC6+, use "-Wl,--hash-style=sysv" or "-Wl,--hash-style=both" to  
>> generate
>> compatible executables. The hash-style option is specific to FC6+  
>> and won't
>> be recognized by other gcc so you cannot make a permanent change  
>> in the
>> Makefile. You may want to do:
>>
>>   $ make XCFLAGS="-Wl,--hash-style=sysv" XLDFLAGS="--hash-style=sysv"
>>
>> To check:
>> $ readelf -l 3.9-12/squeak | grep hash
>>    02     .interp .note.ABI-tag .gnu.hash .dynsym .dynstr
>>                                             ^^^^^^ causes FP  
>> exception.
>> $ readelf -l 3.9-12/squeak | grep hash
>>    02     .interp .note.ABI-tag .hash .dynsym .dynstr
>>                                             ^^^^ compatible one
>
>   Ah, it was a completely known problem, then.  OLPC's suggested
> development environment is FC and we are just using it but I didn't
> know about this.  If the binary is fine on XO, probably we can use the
> option and have less headache.

So we'd need to add "-Wl,--hash-style=both". Can someone think of a  
way to make AutoConf detect the availability of that option? Maybe  
via AC_TRY_LINK()?

- Bert -