Update the comment in util.h related to HAS_QUAD and U64TYPE.

1 files changed, 3 insertions, 1 deletions

diff --git a/util.h b/util.h
index 38c8d2f3ed..87a3f26914 100644
--- a/util.h
+++ b/util.h
@@ -52,7 +52,9 @@ This is a synonym for (! foldEQ_locale())
 #define ibcmp(s1, s2, len)         cBOOL(! foldEQ(s1, s2, len))
 #define ibcmp_locale(s1, s2, len)  cBOOL(! foldEQ_locale(s1, s2, len))
 
-/* perl.h undefs HAS_QUAD if IV isn't 64-bit */
+/* outside the core, perl.h undefs HAS_QUAD if IV isn't 64-bit
+   We can't swap this to HAS_QUAD, because the logic here affects the type of
+   perl_drand48_t below, and that is visible outside of the core.  */
 #ifdef U64TYPE
 #  if !defined(_MSC_VER) || _MSC_VER >= 1300
 /* use a faster implementation when quads are available,