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From Stas Bekman <>
Subject Re: rfc: adding a bootstrap magic check to mp2 DSO libs
Date Fri, 06 Jun 2003 07:20:25 GMT
Philippe M. Chiasson wrote:
> On Fri, 2003-06-06 at 01:08, Geoffrey Young wrote:
>>>we could md5 the perl binary? 
>>what about computing an MD5 hash of various attributes of both perl and 
>>mod_perl - combine a few important bits from $Config the important version 
>>and compile options from mod_perl/apache?
> I've got nothing against combining a few important bits from Config and
> others, but please no MD5 hashing ;-( I'd rather use the perl way:
> perl -V:archname
> i686-linux-perlio
> otherperl -V:archname
> i686-linux-thread-multi-perlio
> The difference is obvious, as opposed to this:
> "error. binary incompatibility detected with
> 4648526406e458418670b4360eea66e0 vs 52daab6784de496a3c123fa1b3b442b8,
> please fix this!"

the point was different. I've suggested to use md5 string for a quick testing. 
whereas the number of string options can grow to be quite big. You can still 
store the user-friendly information and display it on error.

> "error. binary incompatibility detected with i686-linux-perlio vs
> i686-linux-thread-multi-perlio please fix this!"
> But I've tried before and it's quite tricky to get the exact right
> combination of $Config, USE_LARGE_FILES, etc that will guarantee binary
> compatibility. 

exactly: and USE_LARGE_FILES, and glibc version and what not.

I'm thinking about a simpler approach. generate a random unique number and use 
it for comparison. The real problem that we have, is using Apache/ 
against that it wasn't produced with. Just ensuring that 
Apache/ was made by a particular will work just fine.

Have I missed something?

> But I do agree we should be trying as hard as possible ;-)

since you say you have tried before, do you have some prototypes we can re-use?

Stas Bekman            JAm_pH ------> Just Another mod_perl Hacker     mod_perl Guide --->

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