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Niels LohmannandClaude
e2f1b04084
JSON_USE_SIMDUTF was documented and shipped but never compiled by anything in the repository, so nothing held the backend to the behavior the docs promise. Add JSON_TestSimdutf (OFF by default), which fetches simdutf and defines JSON_USE_SIMDUTF for every test target, and a ci_test_simdutf target that runs the whole suite in that configuration. Because simdutf needs C++17, the suite is built at C++11 as well, so one job covers both the scalar fallback with the macro defined and simdutf itself. The dependency hangs off test_main, whose usage requirements every test target inherits. The library target and the installed CMake package are deliberately untouched: making nlohmann_json link simdutf would put a find_dependency() in the exported package, which is a separate decision. Co-Authored-By: Claude <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01MXDi7NTMKAmoArUZSKMc4T Signed-off-by: Niels Lohmann <mail@nlohmann.me>