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Config::Extensions(3perl) Perl Programmers Reference Guide Config::Extensions(3perl)

📛 NAME

Config::Extensions - hash lookup of which core extensions were built.

🚀 Quick Reference

Use Case	Command	Description
Check if an extension is built	$Extensions{ExtensionName}	Returns a true value if the extension is present (dynamic, nonxs, or static).
Determine how an extension is linked	$Extensions{ExtensionName} eq 'dynamic' (or nonxs, static)	Compare the value to one of the three possible types.
Quick alternative to scanning Config	use Config::Extensions '%Extensions'	Provides a convenient hash without manually parsing Config data.

📋 SYNOPSIS

use Config::Extensions '%Extensions';
if ($Extensions{PerlIO::via}) {
    # This perl has PerlIO::via built
}

📚 DESCRIPTION

The Config::Extensions module provides a hash %Extensions containing all the core extensions that were enabled for this perl. The hash is keyed by extension name, with each entry having one of 3 possible values:

• dynamic 🔄 – The extension is dynamically linked.
• nonxs 📜 – The extension is pure perl, so doesn't need linking to the perl executable.
• static ⚙️ – The extension is statically linked to the perl binary.

As all values evaluate to true, a simple if test is good enough to determine whether an extension is present.

All the data used to generate the %Extensions hash is already present in the Config module, but not in such a convenient format to quickly reference.

✍️ AUTHOR

Nicholas Clark <nick AT ccl4.org>

perl v5.34.0 2026-06-23 Config::Extensions(3perl)

📛 NAME 🚀 Quick Reference 📋 SYNOPSIS 📚 DESCRIPTION ✍️ AUTHOR