initial commit

cmake/libraries/json.cmake

@@ -0,0 +1,29 @@
+if(PROJECT_ENABLE_JSON)
+  if(PROJECT_BUILD)
+    add_definitions(-DPROJECT_ENABLE_JSON)
+
+    find_package(nlohmann_json ${JSON_VERSION} REQUIRED)
+
+    if(PROJECT_IS_MINGW AND PROJECT_IS_MINGW_UNIX)
+      include_directories(BEFORE SYSTEM /mingw64/include/nlohmann)
+    else()
+      include_directories(BEFORE SYSTEM ${PROJECT_EXTERNAL_BUILD_ROOT}/include/nlohmann)
+    endif()
+  elseif(NOT PROJECT_IS_MINGW OR CMAKE_HOST_WIN32)
+    ExternalProject_Add(json_project
+      PREFIX external
+      URL ${PROJECT_3RD_PARTY_DIR}/json-${JSON_VERSION}.tar.gz
+      URL_HASH SHA256=${JSON_HASH}
+      LIST_SEPARATOR |
+      CMAKE_ARGS ${PROJECT_EXTERNAL_CMAKE_FLAGS}
+        -DBUILD_SHARED_LIBS=${PROJECT_BUILD_SHARED_LIBS}
+        -DBUILD_STATIC_LIBS=ON
+        -DCMAKE_OSX_ARCHITECTURES=${CMAKE_OSX_ARCHITECTURES}
+        -DJSON_BuildTests=OFF
+        -DJSON_Install=ON
+        -DJSON_MultipleHeaders=OFF
+    )
+
+    list(APPEND PROJECT_DEPENDENCIES json_project)
+  endif()
+endif()