[meta-oe] jsoncpp: add a backport patch to fix build with gcc16

Partially backport https://github.com/open-source-parsers/jsoncpp/commit/71d46ca38e90dc902e8178ba484af4f27fa11947.patch

This fixes build with gcc 16

Upstream-Status: Backport [https://github.com/open-source-parsers/jsoncpp/commit/71d46ca38e90dc902e8178ba484af4f27fa11947]

Signed-off-by: Markus Volk <f_l_k@t-online.de>
---
 ...6ca38e90dc902e8178ba484af4f27fa11947.patch | 59 +++++++++++++++++++
 .../recipes-devtools/jsoncpp/jsoncpp_1.9.7.bb |  1 +
 2 files changed, 60 insertions(+)
 create mode 100644 meta-oe/recipes-devtools/jsoncpp/jsoncpp/71d46ca38e90dc902e8178ba484af4f27fa11947.patch

I had to move the patch status tag to patch itself not the commit message

On Sat, May 30, 2026, 12:08 AM Markus Volk via lists.openembedded.org
<f_l_k=t-online.de@lists.openembedded.org> wrote:

> Partially backport
> https://github.com/open-source-parsers/jsoncpp/commit/71d46ca38e90dc902e8178ba484af4f27fa11947.patch
>
> This fixes build with gcc 16
>
> Upstream-Status: Backport [
> https://github.com/open-source-parsers/jsoncpp/commit/71d46ca38e90dc902e8178ba484af4f27fa11947
> ]
>
> Signed-off-by: Markus Volk <f_l_k@t-online.de>
> ---
>  ...6ca38e90dc902e8178ba484af4f27fa11947.patch | 59 +++++++++++++++++++
>  .../recipes-devtools/jsoncpp/jsoncpp_1.9.7.bb |  1 +
>  2 files changed, 60 insertions(+)
>  create mode 100644
> meta-oe/recipes-devtools/jsoncpp/jsoncpp/71d46ca38e90dc902e8178ba484af4f27fa11947.patch
>
> diff --git
> a/meta-oe/recipes-devtools/jsoncpp/jsoncpp/71d46ca38e90dc902e8178ba484af4f27fa11947.patch
> b/meta-oe/recipes-devtools/jsoncpp/jsoncpp/71d46ca38e90dc902e8178ba484af4f27fa11947.patch
> new file mode 100644
> index 0000000000..3f7ca7bd66
> --- /dev/null
> +++
> b/meta-oe/recipes-devtools/jsoncpp/jsoncpp/71d46ca38e90dc902e8178ba484af4f27fa11947.patch
> @@ -0,0 +1,59 @@
> +From 71d46ca38e90dc902e8178ba484af4f27fa11947 Mon Sep 17 00:00:00 2001
> +From: Jordan Bayles <bayles.jordan@gmail.com>
> +Date: Thu, 14 May 2026 15:57:53 -0700
> +Subject: [PATCH] fix: GCC 16 / C++20 build failure with u8 string literals
> + (#1685)
> +
> +* fix: GCC 16 / C++20 build failure with u8 string literals (#1684)
> +
> +In C++20, the `u8""` string literal prefix was changed to evaluate to
> `const char8_t[]` instead of `const char[]`. This caused compilation errors
> when these literals were implicitly converted to `std::string` or passed to
> functions expecting `const char*`.
> +
> +This commit adds `reinterpret_cast<const char*>` around the `u8` string
> literals in the test suite to resolve the build errors while maintaining
> the intended UTF-8 semantics.
> +
> +Additionally, this adds C++20 to the GitHub Actions CMake test matrix to
> ensure we don't regress on newer standards.
> +
> +Fixes #1684
> +
> +* style: run clang-format
> +---
> + .github/workflows/cmake.yml |  2 +-
> + src/test_lib_json/main.cpp  | 12 +++++++-----
> + 2 files changed, 8 insertions(+), 6 deletions(-)
> +
> +diff --git a/src/test_lib_json/main.cpp b/src/test_lib_json/main.cpp
> +index 501aba10e..08731f66a 100644
> +--- a/src/test_lib_json/main.cpp
> ++++ b/src/test_lib_json/main.cpp
> +@@ -1993,7 +1993,8 @@ JSONTEST_FIXTURE_LOCAL(ValueTest, StaticString) {
> +
> + JSONTEST_FIXTURE_LOCAL(ValueTest, WideString) {
> +   // https://github.com/open-source-parsers/jsoncpp/issues/756
> +-  const std::string uni = u8"\u5f0f\uff0c\u8fdb"; // "式，进"
> ++  const std::string uni =
> ++      reinterpret_cast<const char*>(u8"\u5f0f\uff0c\u8fdb"); // "式，进"
> +   std::string styled;
> +   {
> +     Json::Value v;
> +@@ -3109,9 +3110,9 @@ JSONTEST_FIXTURE_LOCAL(ReaderTest,
> strictModeParseNumber) {
> + }
> +
> + JSONTEST_FIXTURE_LOCAL(ReaderTest, parseChineseWithOneError) {
> +-  checkParse(R"({ "pr)"
> +-             u8"\u4f50\u85e4" // 佐藤
> +-             R"(erty" :: "value" })",
> ++  checkParse(reinterpret_cast<const char*>(R"({ "pr)"
> ++                                           u8"\u4f50\u85e4" // 佐藤
> ++                                           R"(erty" :: "value" })"),
> +              {{18, 19, "Syntax error: value, object or array
> expected."}},
> +              "* Line 1, Column 19\n  Syntax error: value, object or
> array "
> +              "expected.\n");
> +@@ -3223,7 +3224,8 @@ JSONTEST_FIXTURE_LOCAL(CharReaderTest, parseString)
> {
> +     bool ok = reader->parse(doc, doc + std::strlen(doc), &root, &errs);
> +     JSONTEST_ASSERT(ok);
> +     JSONTEST_ASSERT(errs.empty());
> +-    JSONTEST_ASSERT_EQUAL(u8"\u8A2a", root[0].asString()); // "訪"
> ++    JSONTEST_ASSERT_EQUAL(reinterpret_cast<const char*>(u8"\u8A2a"),
> ++                          root[0].asString()); // "訪"
> +   }
> +   {
> +     char const doc[] = R"([ "\uD801" ])";
> diff --git a/meta-oe/recipes-devtools/jsoncpp/jsoncpp_1.9.7.bb
> b/meta-oe/recipes-devtools/jsoncpp/jsoncpp_1.9.7.bb
> index 354f4e9115..bf91f8eff4 100644
> --- a/meta-oe/recipes-devtools/jsoncpp/jsoncpp_1.9.7.bb
> +++ b/meta-oe/recipes-devtools/jsoncpp/jsoncpp_1.9.7.bb
> @@ -16,6 +16,7 @@ PE = "1"
>  SRCREV = "3455302847cf1e4671f1d8f5fa953fd46a7b1404"
>  SRC_URI = "git://
> github.com/open-source-parsers/jsoncpp;branch=master;protocol=https;tag=${PV}
> <http://github.com/open-source-parsers/jsoncpp;branch=master;protocol=https;tag=$%7BPV%7D>
> \
>
> file://0001-Fix-C-11-ABI-breakage-when-compiled-with-C-17-1668-1.patch \
> +           file://71d46ca38e90dc902e8178ba484af4f27fa11947.patch \
>             file://run-ptest \
>             "
>
> --
> 2.54.0
>
>
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