Support for export keyword for templates in sunCC ?

Hello
Currently sunCC says
"OutputTemplate.hh", line 16: Warning: Export ignored -- not yet implemented.if I try to use export to export my templates.
Is sunCC going to support export keyword, like Comeau and Intel compilers ?
When will export be implemented ?
Thank you,
Timothy Madden

Then why the warning message 'not yet implemented' ? It so makes me think that in the next update there I will find it !
And it so makes my appetite for it grow ! :)
I am very sad to hear such a point of view especially as an official attitude.
I mean this reason, that there is only one implementation and the other compiler implementers did not implement it, so Sun will also not implement it, is quite ... hard to expect.
After all, all new C++ features were also not implemented by compiler implementers when they appeared, until they implemented them ...
I do not think many programmers so confuse export ed templates with extern declarations. Most programmers actually know what templates are and how they are instantiated on demand. Beside, the fact that the template definition needs not be seen by the compiler at the point of instantiation is quite true, as this is the point of using export :). The definition will just be found in one of the object files, at some point before linking.
What the "definitions-separate" default compilation model does is effectively including the template definition in every .cc file, just like I would have included it in .hh file in the first place. This is what export is to prevent: it does not include nor need the template definition until some point before linking, at which all translation units have been translated (compiled) and the template definition can be found.
It is true that in a way template instantiations use symbols from both the definition point, and the instantiation point, but this is intentional and the programmers should all well know about it. The C++ language also has quite some others such hidden effects after all ...
Merging the contexts, or instantiating the templates, should actually have nothing to do with the actual linker or the link-time, if export is to be implemented for real.
Rather the instantiation should be a separate step in the build process, after compiling and before linking, effected by a compiler-provided tool created specifically for compiling template definitions (from object files) into instances; or such a tool could be the compiler put in some special post-compile instantiaton mode. The tool would indeed be given all the object files in a program, and would resolve references between them for instantiation requests, as a linker does, so it might look like it is linking; however it only does template instantiation and it includes actual compiler functionality for that, so it is closely related to the compiler.
So instead of a compile-and-link build model application developers would have a compile-instantiate-and-link build model.
I just hope for more people to see how export is, and not rejecting it ...
Thank you,
Timothy Madden
Edited by: Madden on Jan 21, 2010 7:31 PM

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NICE PROJECT;
best regards Alfred

Hi Alfred,
nice project ... just some simple questions:
Did you open a message at SAP? Maybe you could buy some upgrade support, this could be usefull to get direct access to the SAP support...
Which byte order do you use? I know Itanium could use both. But it should be different, otherwise you would use a backup for the migration.
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Best regards
Christian

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