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Fix ci_cuda_example CUDA 11.8 build after C++17 fallback (#3907)

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The 11.8.0 leg's graceful C++17 fallback (added in the previous commit)
worked correctly, but the broadened smoke test used the <=> operator
unconditionally, which isn't valid syntax pre-C++20 — nvcc rejected it
with "expected an expression" once the CMake logic picked cuda_std_17
for the older toolkit. Gate those two lines behind
JSON_HAS_THREE_WAY_COMPARISON like the library itself does internally.

Sanity-compiled the file as plain C++ at both -std=c++17 (skips the
guarded block) and -std=c++20 (includes it) locally; the actual nvcc
build is verified via CI on PR #5248.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann
2026-07-09 09:34:36 +02:00
parent 8917c42bbc
commit 5d534dbd8e
1 changed files with 2 additions and 0 deletions
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tests/cuda_example/json_cuda.cu
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@@ -24,8 +24,10 @@ int main()
nlohmann::json a = {1, 2, 3};
nlohmann::json b = {1, 2, 3};
static_cast<void>(a == b);
#if JSON_HAS_THREE_WAY_COMPARISON
static_cast<void>(a <=> b); // *NOPAD*
static_cast<void>(a <=> 1); // *NOPAD*
#endif
for (const auto& element : a)
{
static_cast<void>(element);