[perl #77238] Aliased @ISA does not work

[perl5.git] / mg.c

diff --git a/mg.c b/mg.c
index abd4a9d..334eb80 100644 (file)
--- a/mg.c
+++ b/mg.c
@@ -1616,18 +1616,24 @@ Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
     if (sv)
        av_clear(MUTABLE_AV(sv));
 
-    /* XXX Once it's possible, we need to
-       detect that our @ISA is aliased in
-       other stashes, and act on the stashes
-       of all of the aliases */
-
-    /* The first case occurs via setisa,
-       the second via setisa_elem, which
-       calls this same magic */
+    if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
+       /* This occurs with setisa_elem magic, which calls this
+          same function. */
+       mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
+
+    if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
+       SV **svp = AvARRAY((AV *)mg->mg_obj);
+       I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
+       while (items--) {
+           stash = GvSTASH((GV *)*svp++);
+           if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
+       }
+
+       return 0;
+    }
+
     stash = GvSTASH(
-        SvTYPE(mg->mg_obj) == SVt_PVGV
-            ? (const GV *)mg->mg_obj
-            : (const GV *)mg_find(mg->mg_obj, PERL_MAGIC_isa)->mg_obj
+        (const GV *)mg->mg_obj
     );
 
     /* The stash may have been detached from the symbol table, so check its