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.IX Title "Config::Extensions 3"
.TH Config::Extensions 3 2019-02-18 "perl v5.38.0" "Perl Programmers Reference Guide"
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.SH NAME
Config::Extensions \- hash lookup of which core extensions were built.
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 4
\&    use Config::Extensions \*(Aq%Extensions\*(Aq;
\&    if ($Extensions{PerlIO::via}) {
\&        # This perl has PerlIO::via built
\&    }
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
The Config::Extensions module provides a hash \f(CW%Extensions\fR 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:
.IP dynamic 4
.IX Item "dynamic"
The extension is dynamically linked
.IP nonxs 4
.IX Item "nonxs"
The extension is pure perl, so doesn't need linking to the perl executable
.IP static 4
.IX Item "static"
The extension is statically linked to the perl binary
.PP
As all values evaluate to true, a simple \f(CW\*(C`if\*(C'\fR test is good enough to determine
whether an extension is present.
.PP
All the data uses to generate the \f(CW%Extensions\fR hash is already present in
the \f(CW\*(C`Config\*(C'\fR module, but not in such a convenient format to quickly reference.
.SH AUTHOR
.IX Header "AUTHOR"
Nicholas Clark <nick@ccl4.org>