🚀 go-pugleaf

In article <C1Grqz.n4z@dcs.ed.ac.uk>, gordonc@epcc.ed.ac.uk writes:
> In article <1k1b9mINN8a6@fido.asd.sgi.com>, walker@owl.asd.sgi.com (Christopher Walker) writes:
> > 
> > In article <C1DHGr.B00@dcs.ed.ac.uk>, gordonc@epcc.ed.ac.uk writes:
> > > Sorry if this has been asked before, but can I use g++ (V2.0) to compile
> > > ImageVision C++ progs, and if so, which options should I use ??
> > > 
> > > Any help appreciated,
> > 
> > We've never tried.. but I strongly doubt that SGI's C++ and gnu's C++ are
> > compatible.  Maybe someone with more experience with g++ would know.  I suspect
> > that the IL would need to be recompiled with g++ and there isn't much likelihood
> > of SGI supporting that.. sorry.
> > 
> 
> .....ermmm, isn't the language specification for C++ fairly strict? If I were to take pieces of C code from my SGI and attempt to compile them elsewhere, I'd like to think that I wouldn't experience too much trouble :-) (also,for example, I can compile GL programs with gcc)
> 

IL ports just fine to the other platforms we've tried.  That's not the issue.
The problem is in how the compilers implement various tricks..

> Incidentally, the trouble is in the linking stage. With the options, -traditional-cpp and -x c++, all is OK until link, when I get :
> 
> gcc -x c++ -traditional-cpp -o imgcat imgcat.c++
> 

Like name mangling.. the names below show me that g++ mangles differently than
ATT's cfront.  I'm sure there are deeper problems like the layout of vtbl's and
other such goodies.. in short I'd give up while your ahead :-)

C++ just isn't as interoperable as you might like because of these little 
hacks that have been used to fool the linker (which knows nothing about 
overloading and class names etc.)

> Undefined:
> getElem__C7ilPixeli
> findLink__15ilIndexableListl
> _._15ilIndexableList
> inList__9ilImgListP7ilImage
> findImg__9ilImgListP7ilImage
> firstImg__9ilImgList
> lastImg__9ilImgList
> nextImg__9ilImgList
> resetCheck__7ilImage
> __as__7ilPixelRC7ilPixel
> ilDataIsSigned
> setInput__7ilImagePT0i
> findParent__7ilImagel
> findChild__7ilImagel
> _._10ilCacheImg
> ilOpenImgFile
> ilCreateImgFile
> childResponse__7ilImagePT0
> parentResponse__7ilImagePT0
> reset__10ilCacheImg
> getSubTile3D__10ilCacheImgiiiiiiPviiiiiiPC8ilConfig
> setSubTile3D__10ilCacheImgiiiiiiPviiiiiiPC8ilConfig
> copyTile3D__10ilCacheImgiiiiiiP7ilImageiiiPii
> fillTile3D__10ilCacheImgiiiiiiPvPC8ilConfigPC6ilTile
> flush__10ilCacheImg
> collect: /usr/bin/ld returned 1 exit status
> 
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Chris Walker (x1106 or walker@sgi.com)