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Test the simdutf backend in CI

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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>
This commit is contained in:
Niels Lohmann
2026-08-28 14:59:30 +00:00
committed by Claude
co-authored by Claude
parent feed1a48a4
commit e2f1b04084
4 changed files with 65 additions and 1 deletions
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docs/mkdocs/docs/api/macros/json_use_simdutf.md
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@@ -60,6 +60,12 @@ By default, `#!cpp JSON_USE_SIMDUTF` is not defined and the portable C++11 scala
target_link_libraries(your_target PRIVATE simdutf::simdutf)
```
!!! hint "Testing this configuration"
The unit tests can be built against the simdutf backend with the CMake option `JSON_TestSimdutf` (`OFF` by
default), which fetches simdutf and defines `JSON_USE_SIMDUTF` for every test target. The `ci_test_simdutf` target
runs the whole test suite in that configuration.
## Version history
- Added in version 3.13.0.