This is forward-compatible: 

use Inline C => <<'__EOS__';

void force_ordinary_string(SV *sv) {
   SvPV_force(sv);
}

__EOS__

force_ordinary_string($$buf);

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In reply to Re: Concatenation with empty string -- good enough to force physical copy? by ikegami
in thread Concatenation with empty string -- good enough to force physical copy? by vr

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