externals: allow users to use system JSON headers (nlohmann-json3) (#7042)
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@ -96,6 +96,7 @@ option(USE_SYSTEM_LIBUSB "Use the system libusb (instead of the bundled libusb)"
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option(USE_SYSTEM_CPP_JWT "Use the system cpp-jwt (instead of the bundled one)" OFF)
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option(USE_SYSTEM_SOUNDTOUCH "Use the system SoundTouch (instead of the bundled one)" OFF)
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option(USE_SYSTEM_CPP_HTTPLIB "Use the system cpp-httplib (instead of the bundled one)" OFF)
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option(USE_SYSTEM_JSON "Use the system JSON (nlohmann-json3) package (instead of the bundled one)" OFF)
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if (CITRA_USE_PRECOMPILED_HEADERS)
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message(STATUS "Using Precompiled Headers.")
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@ -175,7 +175,16 @@ endif()
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# JSON
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add_library(json-headers INTERFACE)
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target_include_directories(json-headers INTERFACE ./json)
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if (USE_SYSTEM_JSON)
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find_package(nlohmann_json REQUIRED)
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target_link_libraries(json-headers INTERFACE nlohmann_json::nlohmann_json)
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get_target_property(NLOHMANN_PREFIX nlohmann_json::nlohmann_json INTERFACE_INCLUDE_DIRECTORIES)
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# The nlohmann-json3 package expects "#include <nlohmann/json.hpp>"
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# Citra uses "#include <json.hpp>" so we have to add this manually
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target_include_directories(json-headers SYSTEM INTERFACE "${NLOHMANN_PREFIX}/nlohmann")
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else()
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target_include_directories(json-headers SYSTEM INTERFACE ./json)
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endif()
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# OpenSSL
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if (USE_SYSTEM_OPENSSL)
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