o Fix Configuration Option for readline library

o Add patch to avoid divide-by-zero trap
o Merge patches for gnuplot-3.7.1

PR:		16120
Submitted by:	Akio Morita <amorita@meadow.scphys.kyoto-u.ac.jp>
Reviewed by:	maintainer

1 files changed, 26 insertions, 0 deletions

diff --git a/math/gnuplot+/files/patch-xc b/math/gnuplot+/files/patch-xc
new file mode 100644
index 000000000000..43b861cb924a
--- /dev/null
+++ b/math/gnuplot+/files/patch-xc
@@ -0,0 +1,26 @@
+# hidden3d-endlessloop
+--- hidden3d.c.ORIG	Thu Aug 19 15:39:28 1999
++++ hidden3d.c	Wed Nov 17 17:42:00 1999
+@@ -2140,14 +2140,20 @@
+ 	    test->tested = is_moved_or_split;
+ 	    SPLIT_TEST_BY_P;
+ 	} else {
+-	    if (loop && (p->tested == is_tested)) {
+-		/* Ouch, seems like we're in trouble, really */
++	    if (loop && (p->tested == is_in_loop)) { 
++		/* Ouch, seems like we're in trouble, really: no way to
++		 * split one of them, and we're in a loop, so we can't
++		 * move p to the front of the list, without risking an
++		 * endless loop. Well, let's just output the darn thing,
++		 * then, no matter what. :-( */
++#if DEBUG /* normally off */
+ 		fprintf(stderr, "\
+ #Failed: In loop, without intersections.\n\
+ #Relations are %d, %d\n",
+ 			p_rel_tplane, t_rel_pplane);
+ 		print_polygon(test, "test");
+ 		print_polygon(p, "p");
++#endif	
+ 		continue;	/* Keep quiet, maybe no-one will notice (;-) */
+ 	    } else {
+ 		PUT_P_IN_FRONT_TEST(is_in_loop);