gnu: json-glib: Fix 32-bit test failures.

* gnu/packages/patches/json-glib-fix-tests-32bit.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register it.
* gnu/packages/gnome.scm (json-glib)[source](patches): New field.

3 files changed, 176 insertions, 0 deletions

diff --git a/gnu/local.mk b/gnu/local.mk
index 49aea157a1..8151f7c9b0 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -788,6 +788,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/java-xerces-xjavac_taskdef.patch	\
   %D%/packages/patches/jemalloc-arm-address-bits.patch		\
   %D%/packages/patches/jbig2dec-ignore-testtest.patch		\
+  %D%/packages/patches/json-glib-fix-tests-32bit.patch		\
   %D%/packages/patches/jq-CVE-2015-8863.patch			\
   %D%/packages/patches/kdbusaddons-kinit-file-name.patch	\
   %D%/packages/patches/khmer-use-libraries.patch                \
diff --git a/gnu/packages/gnome.scm b/gnu/packages/gnome.scm
index c45c821a91..c4fb3398f4 100644
--- a/gnu/packages/gnome.scm
+++ b/gnu/packages/gnome.scm
@@ -2271,6 +2271,7 @@ configuration storage systems.")
               (uri (string-append "mirror://gnome/sources/" name "/"
                                   (version-major+minor version) "/"
                                   name "-" version ".tar.xz"))
+              (patches (search-patches "json-glib-fix-tests-32bit.patch"))
               (sha256
                (base32
                 "1j3dd2xj1l9fi12m1gpmfgf5p4c1w0i970m6k62k3is98yj0jxrd"))))
diff --git a/gnu/packages/patches/json-glib-fix-tests-32bit.patch b/gnu/packages/patches/json-glib-fix-tests-32bit.patch
new file mode 100644
index 0000000000..77ea134915
--- /dev/null
+++ b/gnu/packages/patches/json-glib-fix-tests-32bit.patch
@@ -0,0 +1,174 @@
+Fix floating point issues on 32-bit platforms:
+
+https://gitlab.gnome.org/GNOME/json-glib/issues/27
+
+This is an amalgamation of the following upstream commits:
+https://gitlab.gnome.org/GNOME/json-glib/commit/70e2648e02232c1a439a7418388f18fee9afb3fe
+https://gitlab.gnome.org/GNOME/json-glib/commit/675e27505776a1d77fa1ffd1974284890caec1f4
+
+diff --git a/json-glib/tests/json-test-utils.h b/json-glib/tests/json-test-utils.h
+new file mode 100644
+index 0000000..83a02c6
+--- /dev/null
++++ b/json-glib/tests/json-test-utils.h
+@@ -0,0 +1,21 @@
++#include <string.h>
++#include <math.h>
++#include <float.h>
++#include <glib.h>
++#include <json-glib/json-glib.h>
++
++#define json_fuzzy_equals(n1,n2,epsilon) \
++  (((n1) > (n2) ? ((n1) - (n2)) : ((n2) - (n1))) < (epsilon))
++
++#define json_assert_fuzzy_equals(n1,n2,epsilon) \
++  G_STMT_START { \
++    double __n1 = (n1), __n2 = (n2), __epsilon = (epsilon); \
++    if (json_fuzzy_equals (__n1, __n2, __epsilon)) ; else { \
++      g_assertion_message_cmpnum (G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, \
++                                  #n1 " == " #n2 " (+/- " #epsilon ")", \
++                                  __n1, "==", __n2, 'f'); \
++    } \
++  } G_STMT_END
++
++#define json_assert_almost_equals(n1,n2) \
++  json_assert_fuzzy_equals (n1, n2, DBL_EPSILON)
+diff --git a/json-glib/tests/array.c b/json-glib/tests/array.c
+index 98afeab..426cd72 100644
+--- a/json-glib/tests/array.c
++++ b/json-glib/tests/array.c
+@@ -1,9 +1,4 @@
+-#include <stdio.h>
+-#include <stdlib.h>
+-#include <string.h>
+-
+-#include <glib.h>
+-#include <json-glib/json-glib.h>
++#include "json-test-utils.h"
+ 
+ static void
+ test_empty_array (void)
+@@ -37,7 +32,7 @@ test_add_element (void)
+ 
+   json_array_add_double_element (array, 3.14);
+   g_assert_cmpint (json_array_get_length (array), ==, 3);
+-  g_assert_cmpfloat (json_array_get_double_element (array, 2), ==, 3.14);
++  json_assert_fuzzy_equals (json_array_get_double_element (array, 2), 3.14, 0.001);
+ 
+   json_array_add_boolean_element (array, TRUE);
+   g_assert_cmpint (json_array_get_length (array), ==, 4);
+diff --git a/json-glib/tests/node.c b/json-glib/tests/node.c
+index 23bda63..80beb78 100644
+--- a/json-glib/tests/node.c
++++ b/json-glib/tests/node.c
+@@ -1,6 +1,4 @@
+-#include <glib.h>
+-#include <json-glib/json-glib.h>
+-#include <string.h>
++#include "json-test-utils.h"
+ 
+ static void
+ test_init_int (void)
+@@ -19,7 +17,7 @@ test_init_double (void)
+   JsonNode *node = json_node_new (JSON_NODE_VALUE);
+ 
+   json_node_set_double (node, 3.14159);
+-  g_assert_cmpfloat (json_node_get_double (node), ==, 3.14159);
++  json_assert_fuzzy_equals (json_node_get_double (node), 3.14159, 0.00001);
+ 
+   json_node_free (node);
+ }
+@@ -119,13 +117,13 @@ test_get_int (void)
+ 
+   json_node_set_int (node, 0);
+   g_assert_cmpint (json_node_get_int (node), ==, 0);
+-  g_assert_cmpfloat (json_node_get_double (node), ==, 0.0);
++  json_assert_almost_equals (json_node_get_double (node), 0.0);
+   g_assert (!json_node_get_boolean (node));
+   g_assert (!json_node_is_null (node));
+ 
+   json_node_set_int (node, 42);
+   g_assert_cmpint (json_node_get_int (node), ==, 42);
+-  g_assert_cmpfloat (json_node_get_double (node), ==, 42.0);
++  json_assert_almost_equals (json_node_get_double (node), 42.0);
+   g_assert (json_node_get_boolean (node));
+   g_assert (!json_node_is_null (node));
+ 
+@@ -138,7 +136,7 @@ test_get_double (void)
+   JsonNode *node = json_node_new (JSON_NODE_VALUE);
+ 
+   json_node_set_double (node, 3.14);
+-  g_assert_cmpfloat (json_node_get_double (node), ==, 3.14);
++  json_assert_fuzzy_equals (json_node_get_double (node), 3.14, 0.001);
+   g_assert_cmpint (json_node_get_int (node), ==, 3);
+   g_assert (json_node_get_boolean (node));
+ 
+@@ -232,9 +230,9 @@ test_gvalue_autopromotion (void)
+     g_print ("Expecting a gdouble, got a %s\n", g_type_name (G_VALUE_TYPE (&check))); 
+ 
+   g_assert_cmpint (G_VALUE_TYPE (&check), ==, G_TYPE_DOUBLE);
+-  g_assert_cmpfloat ((float) g_value_get_double (&check), ==, 3.14159f);
++  json_assert_fuzzy_equals (g_value_get_double (&check), 3.14159, 0.00001);
+   g_assert_cmpint (G_VALUE_TYPE (&value), !=, G_VALUE_TYPE (&check));
+-  g_assert_cmpfloat ((gdouble) g_value_get_float (&value), ==, g_value_get_double (&check));
++  json_assert_almost_equals (g_value_get_float (&value), g_value_get_double (&check));
+ 
+   g_value_unset (&value);
+   g_value_unset (&check);
+diff --git a/json-glib/tests/parser.c b/json-glib/tests/parser.c
+index f71584a..8c52a1d 100644
+--- a/json-glib/tests/parser.c
++++ b/json-glib/tests/parser.c
+@@ -1,11 +1,5 @@
+-#include "config.h"
+-
++#include "json-test-utils.h"
+ #include <stdlib.h>
+-#include <stdio.h>
+-
+-#include <glib.h>
+-
+-#include <json-glib/json-glib.h>
+ 
+ static const gchar *test_empty_string = "";
+ static const gchar *test_empty_array_string = "[ ]";
+@@ -38,13 +32,13 @@ verify_string_value (JsonNode *node)
+ static void
+ verify_double_value (JsonNode *node)
+ {
+-  g_assert_cmpfloat (10.2e3, ==, json_node_get_double (node));
++  json_assert_fuzzy_equals (10.2e3, json_node_get_double (node), 0.1);
+ }
+ 
+ static void
+ verify_negative_double_value (JsonNode *node)
+ {
+-  g_assert_cmpfloat (-3.14, ==, json_node_get_double (node));
++  json_assert_fuzzy_equals (-3.14, json_node_get_double (node), 0.01);
+ }
+ 
+ static const struct {
+diff --git a/json-glib/tests/reader.c b/json-glib/tests/reader.c
+index 43a6aac..9bab312 100644
+--- a/json-glib/tests/reader.c
++++ b/json-glib/tests/reader.c
+@@ -1,9 +1,4 @@
+-#include <stdlib.h>
+-#include <stdio.h>
+-
+-#include <glib.h>
+-
+-#include <json-glib/json-glib.h>
++#include "json-test-utils.h"
+ 
+ static const gchar *test_base_array_data =
+ "[ 0, true, null, \"foo\", 3.14, [ false ], { \"bar\" : 42 } ]";
+@@ -78,7 +73,7 @@ test_base_object (void)
+   g_assert (json_reader_get_error (reader) == NULL);
+ 
+   json_reader_read_member (reader, "double");
+-  g_assert_cmpfloat (json_reader_get_double_value (reader), ==, 42.47);
++  json_assert_fuzzy_equals (json_reader_get_double_value (reader), 42.47, 0.01);
+   json_reader_end_element (reader);
+ 
+   g_object_unref (reader);