From the Module::Load::Conditional POD for can_load:

autoload

This controls whether imports the functions of a loaded modules to the caller package. The default is no importing any functions.

You haven't asked for the exported functions to be imported into your package.

Disable the prototype? I'm not sure what you mean by that. Explicitly using &share...

You got it :)

Explicitly using &share($gnWarning) makes no difference,

It won't if share() has not been imported into your package; unless you fully qualify it.

If you know of any way to configure a program to use threads based on the perl executable being compiled with it, and not use it otherwise, other than the method I'm trying, I'd be interested to know.
use Config;

if( $Config{ useithreads } eq 'define' ) {
    ## compiled with ithreads
    require threads; threads->import;
    require threads::shared; threads::shared->import
}
else {
    ## not
}

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In reply to Re^3: Problem conditionally making variables shared if using threads by BrowserUk
in thread Problem conditionally making variables shared if using threads by billgdev

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