integrate cfgperl changes#6325..6373 into mainline

(NOTE: today's batch of integrations still untested)

p4raw-link: @6373 (not found)
p4raw-link: @6325 on //depot/cfgperl: d6ac44cc5a00fa38a56717785146bc16b716472c

p4raw-id: //depot/perl@6373

1 files changed, 3 insertions, 0 deletions

diff --git a/doio.c b/doio.c
index 8789df92de..19f7861e2e 100644
--- a/doio.c
+++ b/doio.c
@@ -1917,6 +1917,9 @@ Perl_do_msgrcv(pTHX_ SV **mark, SV **sp)
 
     id = SvIVx(*++mark);
     mstr = *++mark;
+    /* suppress warning when reading into undef var --jhi */
+    if (! SvOK(mstr))
+	sv_setpvn(mstr, "", 0);
     msize = SvIVx(*++mark);
     mtype = (long)SvIVx(*++mark);
     flags = SvIVx(*++mark);