gnu: datamash: Fix tests on ARM systems.

* gnu/packages/patches/datamash-arm-tests.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/datamash.scm (datamash)[source]: Use it.

gnu/local.mk

@@ -620,6 +620,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/cursynth-wave-rand.patch			\
   %D%/packages/patches/cvs-2017-12836.patch			\
   %D%/packages/patches/cyrus-sasl-CVE-2013-4122.patch		\
+  %D%/packages/patches/datamash-arm-tests.patch			\
   %D%/packages/patches/dbus-helper-search-path.patch		\
   %D%/packages/patches/deja-dup-use-ref-keyword-for-iter.patch	\
   %D%/packages/patches/delly-use-system-libraries.patch		\

gnu/packages/datamash.scm

@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2014 Eric Bavier <bavier@member.fsf.org>
+;;; Copyright © 2014, 2018 Eric Bavier <bavier@member.fsf.org>
 ;;; Copyright © 2016, 2017 Efraim Flashner <efraim@flashner.co.il>
 ;;;
 ;;; This file is part of GNU Guix.
@@ -22,6 +22,7 @@
   #:use-module (guix licenses)
   #:use-module (guix download)
   #:use-module (guix build-system gnu)
+  #:use-module (gnu packages)
   #:use-module (gnu packages perl)
   #:use-module (gnu packages base))
 
@@ -36,7 +37,8 @@
                           version ".tar.gz"))
       (sha256
        (base32
-        "19jpcv4ryvbz0476d6dgpxpbjkpmih4q84wj06nslls338bm5fzf"))))
+        "19jpcv4ryvbz0476d6dgpxpbjkpmih4q84wj06nslls338bm5fzf"))
+      (patches (search-patches "datamash-arm-tests.patch"))))
     (native-inputs
      `(("which" ,which)                 ;for tests
        ("perl" ,perl)))                 ;for help2man

gnu/packages/patches/datamash-arm-tests.patch

@@ -0,0 +1,71 @@
+See https://lists.gnu.org/archive/html/bug-datamash/2018-03/msg00003.html and
+https://lists.gnu.org/archive/html/bug-datamash/2018-03/txt4DmvR7p6J9.txt
+
+From d446dba317aa067440d6312d955d523129949327 Mon Sep 17 00:00:00 2001
+From: Assaf Gordon <address@hidden>
+Date: Thu, 22 Mar 2018 11:00:34 -0600
+Subject: [PATCH 1/2] tests: fix --format='%4000f' expected output
+
+Can be 1.000009... or 1.000008999, depending on representation.
+
+* tests/datamash-output-format.pl: Check only the first 5 digits.
+---
+ tests/datamash-output-format.pl | 9 +++++----
+ 1 file changed, 5 insertions(+), 4 deletions(-)
+
+diff --git a/tests/datamash-output-format.pl b/tests/datamash-output-format.pl
+index 52c68a2..ca99bb0 100755
+--- a/tests/datamash-output-format.pl
++++ b/tests/datamash-output-format.pl
+@@ -98,12 +98,13 @@ my @Tests =
+    {OUT => "0" x 3999 . "1\n"}],
+ 
+   # due to binary floating representation, some decimal point digits won't be
+-  # zero (e.g. 1.0000090000000000000000000000000523453254320000000...).
+-  # The OUT_SUBST replaces exactly 3994 digits (as expected from the format)
++  # zero (e.g. 1.0000090000000000000000000000000523453254320000000... or
++  # 1.000008999999...).
++  # The OUT_SUBST replaces exactly 3995 digits (as expected from the format)
+   # with an "X".
+   ['m2', '--format "%.4000f"   sum 1',  {IN_PIPE=>$in1},
+-   {OUT => "1.000009X\n"},
+-   {OUT_SUBST => 's/^(1\.000009)([0-9]{3994})$/\1X/'}],
++   {OUT => "1.00000X\n"},
++   {OUT_SUBST => 's/^(1\.00000)([0-9]{3995})$/\1X/'}],
+ 
+ );
+ 
+-- 
+2.7.4
+
+
+From f4871963974a96d6e69cb80b9c2fac7ff0c1d472 Mon Sep 17 00:00:00 2001
+From: Assaf Gordon <address@hidden>
+Date: Thu, 22 Mar 2018 11:18:13 -0600
+Subject: [PATCH 2/2] tests: disable --format="%a" test
+
+Valid output can differ (e.g. 0x8.000p-3 vs 0x1.000p+0).
+
+* tests/datamash-output-format.pl: Disable 'a1' test.
+---
+ tests/datamash-output-format.pl | 4 +++-
+ 1 file changed, 3 insertions(+), 1 deletion(-)
+
+diff --git a/tests/datamash-output-format.pl b/tests/datamash-output-format.pl
+index ca99bb0..5e90ae0 100755
+--- a/tests/datamash-output-format.pl
++++ b/tests/datamash-output-format.pl
+@@ -90,7 +90,9 @@ my @Tests =
+   ['e2', '--format "%.3e"  sum 1', {IN_PIPE=>$in1}, {OUT=>"1.000e+00\n"}],
+ 
+   # Test Custom formats: %a
+-  ['a1', '--format "%0.3a" sum 1', {IN_PIPE=>$in1}, {OUT=>"0x8.000p-3\n"}],
++  # Disable the test for now. Valid output can differ (e.g. 0x8.000p-3 and
++  # 0x1.000p0 ).
++  # ['a1', '--format "%0.3a" sum 1', {IN_PIPE=>$in1}, {OUT=>"0x8.000p-3\n"}],
+ 
+ 
+   # Custom formats can use lots of memory
+-- 
+2.7.4
+