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[cellml-discussion] Errors building the C++ API


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  • From: ak.miller at auckland.ac.nz (Andrew Miller)
  • Subject: [cellml-discussion] Errors building the C++ API
  • Date: Mon, 20 Aug 2007 13:31:22 +1200
David Nickerson wrote:
> Andrew Miller wrote:
>
>> David Nickerson wrote:
>>
>>> Hi all,
>>>
>>> I know Andrew and I have discussed this in the past but just thought I'd
>>> raise the issue here and see if anyone has any ideas.
>>>
>>> I have just begun trying to build the C++ API implementation using the
>>> latest svn trunk code. I'm using a freshly installed Fedora 7 Linux box
>>> (gcc (GCC) 4.1.2 20070502 (Red Hat 4.1.2-12)). This used to work fine on
>>> my previous Fedora Core 5 install, but since FC6 the Fedora project
>>>
>>>
>> The problem is that Red Hat maintains the compiler and they always seem
>> to sneak in a few 'bleeding edge' changes into their version, which
>> often break obscure features of gcc (last time I looked into it, I
>> believe they had an earlier, broken patch of the visibility patch, and
>> we simply check that visibility is present and use it if it is. FC's
>> patches mean the test passes, but visibility doesn't actually work quite
>> right). I am not sure why the problem has persisted into newer versions
>> - I would have thought they would have moved to a newer gcc with
>> visibility support instead of using their patch.
>>
>
> yep - thats what I would have thought, and looking around no one is
> really reporting the issue anywhere. which leads me to start thinking
> that maybe Bob got it right? the API implementation isn't doing anything
> particularly specially is it?
>

I don't think many people actually use the visibility features of gcc
with C++ classes like we do, or if they do, perhaps they have better
configure tests for whether visibility works? We could improve this, or
just try to detect Fedora and turn it off (visibility isn't essential,
but it makes Linux builds fail in some cases where they wouldn't
normally but Win32 builds would, and it decreases the size of the
libraries, and forces people not to call internal functions they are not
supposed to).

Best regards,
Andrew

>
> Andre.
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