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--- a/CMake/external_json.cmake.orig 2026-04-06 14:26:00.677001990 +0800
+++ b/CMake/external_json.cmake 2026-04-06 14:26:00.677001990 +0800
@@ -1,49 +1,10 @@
cmake_minimum_required(VERSION 3.10)
include(ExternalProject)
-
-
# We use a function to enforce a scoped variables creation only for the build
# (i.e turn off BUILD_SHARED_LIBS which is used on LRS build as well)
function(get_nlohmann_json)
-
- message( STATUS #CHECK_START
- "Fetching nlohmann/json..." )
- #list( APPEND CMAKE_MESSAGE_INDENT " " ) # Indent outputs
-
- # We want to clone the json repo and build it here, during configuration, so we can use it.
- # But ExternalProject_add is limited in that it only does its magic during build.
- # This is possible in CMake 3.12+ with FetchContent and FetchContent_MakeAvailable in 3.14+ (meaning Ubuntu 20)
- # but we need to adhere to CMake 3.10 (Ubuntu 18).
- # So instead, we invoke a new CMake project just to download pybind:
- configure_file( CMake/json-download.cmake.in
- ${CMAKE_BINARY_DIR}/external-projects/json-download/CMakeLists.txt )
- execute_process( COMMAND "${CMAKE_COMMAND}" -G "${CMAKE_GENERATOR}" . "--no-warn-unused-cli"
- -DCMAKE_MAKE_PROGRAM=${CMAKE_MAKE_PROGRAM}
- -DCMAKE_TOOLCHAIN_FILE=${CMAKE_TOOLCHAIN_FILE}
- -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
- WORKING_DIRECTORY "${CMAKE_BINARY_DIR}/external-projects/json-download"
- OUTPUT_QUIET
- RESULT_VARIABLE configure_ret )
- execute_process( COMMAND "${CMAKE_COMMAND}" --build .
- WORKING_DIRECTORY "${CMAKE_BINARY_DIR}/external-projects/json-download"
- OUTPUT_QUIET
- RESULT_VARIABLE build_ret )
-
- if( configure_ret OR build_ret )
- message( FATAL_ERROR "Failed to download nlohmann/json" )
- endif()
-
- add_subdirectory( "${CMAKE_BINARY_DIR}/third-party/json"
- "${CMAKE_BINARY_DIR}/third-party/json/build" )
-
- # We cannot directly interface with nlohmann_json (doesn't work on bionic)
- #install( TARGETS nlohmann_json EXPORT realsense2Targets )
-
- message( STATUS #CHECK_PASS
- "Fetching nlohmann/json - Done" )
- #list( POP_BACK CMAKE_MESSAGE_INDENT ) # Unindent outputs (requires cmake 3.15)
-
+ find_package(nlohmann_json REQUIRED)
endfunction()
# Trigger the build
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