lib/ExtUtils/typemap: silence g++ warning.

From the added code comment:

    The weird way this is written is because g++ is dumb
    enough to warn "comparison is always false" on something
    like:

    sizeof(a) > sizeof(b) && a > B_t_MAX

    (where the LH condition is false)

1 files changed, 11 insertions, 3 deletions

diff --git a/lib/ExtUtils/typemap b/lib/ExtUtils/typemap
index 1cdb8465f6..4bfba95e9e 100644
--- a/lib/ExtUtils/typemap
+++ b/lib/ExtUtils/typemap
@@ -379,9 +379,17 @@ T_ARRAY
         {
 	    U32 ix_$var;
             SSize_t extend_size =
-                sizeof(size_$var) > sizeof(SSize_t) && size_$var > SSize_t_MAX
-                    ? -1 /* might wrap; -1 triggers a panic in EXTEND() */
-                    : (SSize_t)size_$var;
+                /* The weird way this is written is because g++ is dumb
+                 * enough to warn "comparison is always false" on something
+                 * like:
+                 *
+                 * sizeof(a) > sizeof(b) && a > B_t_MAX
+                 *
+                 * (where the LH condition is false)
+                 */
+                (size_$var > (sizeof(size_$var) > sizeof(SSize_t)
+                              ? SSize_t_MAX : size_$var))
+                ? -1 : (SSize_t)size_$var;
 	    EXTEND(SP, extend_size);
 	    for (ix_$var = 0; ix_$var < size_$var; ix_$var++) {
 		ST(ix_$var) = sv_newmortal();