gnu: jsoncpp: Fix test failure on armhf-linux and aarch64-linux.

* gnu/packages/patches/jsoncpp-fix-inverted-case.patch: New file.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.
* gnu/packages/serialization.scm (jsoncpp)[source](patches): New field.

1 files changed, 22 insertions, 0 deletions

diff --git a/gnu/packages/patches/jsoncpp-fix-inverted-case.patch b/gnu/packages/patches/jsoncpp-fix-inverted-case.patch
new file mode 100644
index 0000000000..e4897de1b8
--- /dev/null
+++ b/gnu/packages/patches/jsoncpp-fix-inverted-case.patch
@@ -0,0 +1,22 @@
+This patch fixes a bug and related test failure on platforms where 'char'
+is unsigned.
+
+Taken from upstream:
+https://github.com/open-source-parsers/jsoncpp/commit/f11611c8785082ead760494cba06196f14a06dcb
+
+diff --git a/src/lib_json/json_writer.cpp b/src/lib_json/json_writer.cpp
+index 8e06cca2..56195dc1 100644
+--- a/src/lib_json/json_writer.cpp
++++ b/src/lib_json/json_writer.cpp
+@@ -178,8 +178,9 @@ static bool isAnyCharRequiredQuoting(char const* s, size_t n) {
+ 
+   char const* const end = s + n;
+   for (char const* cur = s; cur < end; ++cur) {
+-    if (*cur == '\\' || *cur == '\"' || *cur < ' ' ||
+-        static_cast<unsigned char>(*cur) < 0x80)
++    if (*cur == '\\' || *cur == '\"' ||
++        static_cast<unsigned char>(*cur) < ' ' ||
++        static_cast<unsigned char>(*cur) >= 0x80)
+       return true;
+   }
+   return false;