[GEM-dev] gem fails on 10.4

[Hans-Christoph Steiner]

On Nov 25, 2009, at 12:36 AM, IOhannes m zmoelnig wrote:

> Hans-Christoph Steiner wrote:
>>
>>
>> I definitely did not change the headers, and since they are in
>> /System/Library, that means no package installs, that's only for  
>> stuff
>> that comes from Apple.  Whether they are 'wrong' or not is then a
>> question for Apple.  And we mostly likely have to deal with a  
>> workaround
>> :)  Sounds like Apple fixed this in 10.5...
>
> probably.
> it's only weird that i have found zero documentation about this.
> everything i find would be in accordance to how it was handled in Gem
> (and which failed on the build machine).
>
> anyhow,....
>
>>
>> and that's where the compiler text comes in. If you are building on
>> 10.4, you'll be bulding with an older version of gcc.  10.5 has a  
>> newer
>> version.   The easiest way to test that is to test for that build  
>> number
>> that I quoted you before.
>
> oh no.
> i plainly refuse to relate the problems of some header revision to the
> version of gcc.
> the compiler you are using is the compiler you have installed, not the
> one on the DVD you bought to install your operatingsystem.
>
> your test is a good one if you want to test whether you can use a
> specific extension of the compiler (e.g. your favourite pragma).
> it's a really bad one to test for the capabilities of a library.
> e.g. we don't use __APPLE_CC__ to detect whether the target system is
> running OSX (just like we don't use __GNUC__ to detect whether the
> target system is linux.
> we also don't use the __APPLE_CC__ version number to test which
> architecture the target has (e.g. because older versions of OSX only  
> ran
> on ppc whereas the latest and greatest only runs on little endian  
> archs)
>
> i guess you get what i want to say :-)
>
>
> fgmasdr
> IOhannes
>
> PS: the crucial part of my email started with "in the meantime".

All I am saying is that this is a technique used for a  bunch of  
code.  I think that newer versions of gcc do stricter testing, that's  
why its relevant.

.hc



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