Testing.

.gitmodules

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+[submodule "dependencies/simdjson"]
+	path = dependencies/simdjson
+	url = https://github.com/simdjson/simdjson.git

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.9) # CMP0069 NEW
+
+project(simdjson
+  DESCRIPTION "simdjson demo"
+  LANGUAGES CXX 
+)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
+set(CMAKE_MACOSX_RPATH OFF)
+set(CMAKE_THREAD_PREFER_PTHREAD ON)
+set(THREADS_PREFER_PTHREAD_FLAG ON) 
+
+set(PROJECT_VERSION_MAJOR 0)
+set(PROJECT_VERSION_MINOR 0)
+set(PROJECT_VERSION_PATCH 1)
+add_subdirectory(dependencies)
+add_subdirectory(src)
+

README.md

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+Simple demo to show that we can use simdjson as a CMake dependency.
+
+```
+mkdir build && cd build && cmake .. && cmake --build . && ./src/test
+```

dependencies/CMakeLists.txt

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+function(initialize_submodule DIRECTORY)
+  if(NOT EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${DIRECTORY}/.git)
+    find_package(Git QUIET REQUIRED)
+    message(STATUS "${CMAKE_CURRENT_SOURCE_DIR}/${DIRECTORY}/.git does not exist. Initializing ${DIRECTORY} submodule ...")
+    execute_process(COMMAND ${GIT_EXECUTABLE} submodule update --init ${DIRECTORY}
+                    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+                    RESULT_VARIABLE GIT_EXIT_CODE)
+    if(NOT GIT_EXIT_CODE EQUAL "0")
+      message(FATAL_ERROR "${GIT_EXECUTABLE} submodule update --init dependencies/${DIRECTORY} failed with exit code ${GIT_EXIT_CODE}, please checkout submodules")
+    endif()
+  endif()
+endfunction(initialize_submodule)
+
+  initialize_submodule(simdjson)
+  add_library(simdjsondep INTERFACE)
+  target_include_directories(simdjsondep INTERFACE simdjson/include)
+  add_subdirectory(simdjson EXCLUDE_FROM_ALL)

src/CMakeLists.txt

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+add_executable(test test.cpp) 
+
+target_link_libraries(test simdjson) 
+target_link_libraries(test simdjsondep) 
+

src/test.cpp

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+#include "simdjson.h"
+int main(int argc, char* argv[]) {
+  if(argc < 2) {
+      std::cout << "provide the filename of a JSON file" << std::endl;
+      return EXIT_FAILURE;
+  }
+  try {
+    simdjson::dom::parser parser;
+    simdjson::dom::element doc = parser.load(argv[1]);
+    std::cout << "found valid JSON" << std::endl;
+    return EXIT_SUCCESS;
+  } catch (simdjson::simdjson_error &e) {
+    std::cout << "Exception! Bad JSON?" << std::endl;
+    std::cout << e.what() << std::endl;
+    return EXIT_FAILURE;
+  }
+}