PP_sort.c contains all these routines which appear to be defined such that they could be used as alternatives to Perl_sv_cmp:
S_sortcv(pTHX_ SV *a, SV *b)
S_sortcv_stacked(pTHX_ SV *a, SV *b)
S_sortcv_xsub(pTHX_ SV *a, SV *b)
S_sv_ncmp(pTHX_ SV *a, SV *b)
S_sv_i_ncmp(pTHX_ SV *a, SV *b)
S_amagic_ncmp(pTHX_ register SV *a, register SV *b)
S_amagic_i_ncmp(pTHX_ register SV *a, register SV *b)
S_amagic_cmp(pTHX_ register SV *str1, register SV *str2)
S_amagic_cmp_locale(pTHX_ register SV *str1, register SV *str2)
They are prototyped in proto.h and aliased in embed.h, but even including those explicitly does not allow them to be seen at compile time?
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