gnu: gsl: Fix poly test on i686.

* gnu/packages/patches/gsl-poly-test-fix-pt1.patch,
  gnu/packages/patches/gsl-poly-test-fix-pt2.patch: New files.
* gnu-system.am (dist_patch_DATA): Add them.
* gnu/packages/maths.scm (gsl)[source]: Add patches.

gnu-system.am

@@ -450,6 +450,8 @@ dist_patch_DATA =						\
   gnu/packages/patches/grep-CVE-2015-1345.patch			\
   gnu/packages/patches/grub-gets-undeclared.patch		\
   gnu/packages/patches/grub-freetype.patch			\
+  gnu/packages/patches/gsl-poly-test-fix-pt1.patch		\
+  gnu/packages/patches/gsl-poly-test-fix-pt2.patch		\
   gnu/packages/patches/guile-1.8-cpp-4.5.patch			\
   gnu/packages/patches/guile-arm-fixes.patch			\
   gnu/packages/patches/guile-default-utf8.patch			\

gnu/packages/maths.scm

@@ -154,7 +154,9 @@ semiconductors.")
                           version ".tar.gz"))
       (sha256
        (base32
-        "0lrgipi0z6559jqh82yx8n4xgnxkhzj46v96dl77hahdp58jzg3k"))))
+        "0lrgipi0z6559jqh82yx8n4xgnxkhzj46v96dl77hahdp58jzg3k"))
+      (patches (map search-patch '("gsl-poly-test-fix-pt1.patch"
+                                   "gsl-poly-test-fix-pt2.patch")))))
     (build-system gnu-build-system)
     (arguments
      `(#:parallel-tests? #f

gnu/packages/patches/gsl-poly-test-fix-pt1.patch

@@ -0,0 +1,84 @@
+From 9cc12d0377dd634b1b97954d076b715f982853b7 Mon Sep 17 00:00:00 2001
+From: Patrick Alken <alken@colorado.edu>
+Date: Fri, 4 Apr 2014 13:36:16 -0600
+Subject: [PATCH] bug fix in sorting of complex numbers (bug #39055)
+
+---
+ poly/test.c | 49 ++++++++++++++++++++++++++++++-------------------
+ 1 file changed, 30 insertions(+), 19 deletions(-)
+
+diff --git a/poly/test.c b/poly/test.c
+index 9c147f6..d090802 100644
+--- a/poly/test.c
++++ b/poly/test.c
+@@ -25,11 +25,21 @@
+ #include <gsl/gsl_poly.h>
+ #include <gsl/gsl_heapsort.h>
+ 
++/* sort by Re(z) then by Im(z) */
+ static int
+ cmp_cplx(const double *a, const double *b)
+ {
+-	double t = (a[0] * a[0] + a[1] * a[1]) - (b[0] * b[0] + b[1] * b[1]);
+-	return t < 0.0 ? -1 : t > 0.0 ? 1 : 0;
++  double r = a[0] - b[0];
++
++  if (r == 0.0)
++    {
++      double t = a[1] - b[1];
++	    return t < 0.0 ? -1 : t > 0.0 ? 1 : 0;
++    }
++  else if (r < 0.0)
++    return -1;
++  else
++    return 1;
+ }
+ 
+ int
+@@ -534,25 +544,26 @@ main (void)
+        Problem reported by Munagala Ramanath (bug #39055)
+     */
+ 
+-    double a[16] = { 32, -48, -8, 28, -8, 16, -16, 12, -16, 6, 10, -17, 10, 2, -4, 1 };
++    double a[16] = { 32, -48, -8, 28, -8, 16, -16, 12,
++                    -16, 6, 10, -17, 10, 2, -4, 1 };
+     double z[16*2];
+ 
+-    double expected[16*20] = {
+-	   1.0000000000000000,  0.00000000000000000,
+-	   1.0000000000000000,  0.00000000000000000,
+-	  -1.0000000000000000,  0.00000000000000000,
+-	 -0.65893856175240950,  0.83459757287426684,
+-	 -0.65893856175240950, -0.83459757287426684,
+-	-0.070891117403341281,  -1.1359249087587791,
+-	-0.070891117403341281,   1.1359249087587791,
+-	   1.1142366961812986, -0.48083981203389980,
+-	   1.1142366961812986,  0.48083981203389980,
+-	  -1.3066982484920768,  0.00000000000000000,
+-	  0.57284747839410854,   1.1987808988289705,
+-	  0.57284747839410854,  -1.1987808988289705,
+-	  -1.6078107423472359,  0.00000000000000000,
+-	   2.0000000000000000,  0.00000000000000000,
+-	   2.0000000000000000,  0.00000000000000000 };
++    double expected[16*2] = {
++     -1.6078107423472359,    0.00000000000000000,
++     -1.3066982484920768,    0.00000000000000000,
++     -1.0000000000000000,    0.00000000000000000,
++     -0.65893856175240950,  -0.83459757287426684,
++     -0.65893856175240950,   0.83459757287426684,
++     -0.070891117403341281, -1.1359249087587791,
++     -0.070891117403341281,  1.1359249087587791,
++      0.57284747839410854,  -1.1987808988289705,
++      0.57284747839410854,   1.1987808988289705,
++      1.0000000000000000,    0.00000000000000000,
++      1.0000000000000000,    0.00000000000000000,
++      1.1142366961812986,   -0.48083981203389980,
++      1.1142366961812986,    0.48083981203389980,
++      2.0000000000000000,    0.00000000000000000,
++      2.0000000000000000,    0.00000000000000000 };
+ 
+     int i;
+ 
+-- 
+2.4.3
+

gnu/packages/patches/gsl-poly-test-fix-pt2.patch

@@ -0,0 +1,27 @@
+From 0466df8660a7b6ddf2e082a1ec38bc6ea25a3c5c Mon Sep 17 00:00:00 2001
+From: Patrick Alken <alken@colorado.edu>
+Date: Mon, 7 Apr 2014 10:59:58 -0600
+Subject: [PATCH] change error test for 15th degree polynomial (bug #39055)
+
+---
+ poly/test.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/poly/test.c b/poly/test.c
+index d090802..f6a7e3f 100644
+--- a/poly/test.c
++++ b/poly/test.c
+@@ -579,8 +579,8 @@ main (void)
+ 
+     for (i = 0; i<15; i++)
+       {
+-        gsl_test_abs (z[2*i], expected[2*i], 1e-7, "z%d.real, 15th-order polynomial", i);
+-        gsl_test_abs (z[2*i+1], expected[2*i+1], 1e-7, "z%d.imag, 15th-order polynomial", i);
++        gsl_test_rel (z[2*i], expected[2*i], 1e-7, "z%d.real, 15th-order polynomial", i);
++        gsl_test_rel (z[2*i+1], expected[2*i+1], 1e-7, "z%d.imag, 15th-order polynomial", i);
+       }
+   }
+ 
+-- 
+2.4.3
+