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Niels Lohmann
6a406ee141
Closes #3106. set(JSON_Diagnostics ON) before find_package() has no effect on a package built and installed elsewhere (Homebrew, vcpkg, a system package, etc.) -- the compile definition is baked into the exported nlohmann_jsonTargets.cmake at install time and the generated config script never re-reads that variable. Verified empirically against the real Homebrew-installed 3.12.0 package: the exported target carries a fixed $<$<BOOL:OFF>:JSON_DIAGNOSTICS=1>, and the suggested set(JSON_Diagnostics ON) snippet produces no change in exception output. Documents the actual working fix (overriding the imported target's INTERFACE_COMPILE_DEFINITIONS property after find_package()) and the multi-target "JSON_DIAGNOSTICS redefined" pitfall reported earlier in the issue thread. Signed-off-by: Niels Lohmann <mail@nlohmann.me> Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>
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