feat: add nlohmann/json library

Author: wgtmac

cmake_modules/IcebergThirdpartyToolchain.cmake

@@ -226,3 +226,31 @@ function(resolve_nanoarrow_dependency)
 endfunction()
 
 resolve_nanoarrow_dependency()
+
+# ----------------------------------------------------------------------
+# nlohmann-json
+
+function(resolve_nlohmann_json_dependency)
+  prepare_fetchcontent()
+
+  set(JSON_BuildTests
+      OFF
+      CACHE BOOL "" FORCE)
+
+  fetchcontent_declare(nlohmann_json
+                       ${FC_DECLARE_COMMON_OPTIONS}
+                       URL "https://github.com/nlohmann/json/releases/download/v3.11.3/json.tar.xz"
+  )
+  fetchcontent_makeavailable(nlohmann_json)
+
+  set_target_properties(nlohmann_json
+                        PROPERTIES OUTPUT_NAME "iceberg_vendored_nlohmann_json"
+                                   POSITION_INDEPENDENT_CODE ON)
+  install(TARGETS nlohmann_json
+          EXPORT iceberg_targets
+          RUNTIME DESTINATION "${ICEBERG_INSTALL_BINDIR}"
+          ARCHIVE DESTINATION "${ICEBERG_INSTALL_LIBDIR}"
+          LIBRARY DESTINATION "${ICEBERG_INSTALL_LIBDIR}")
+endfunction()
+
+resolve_nlohmann_json_dependency()

src/iceberg/CMakeLists.txt

@@ -33,10 +33,10 @@ set(ICEBERG_SHARED_BUILD_INTERFACE_LIBS)
 set(ICEBERG_STATIC_INSTALL_INTERFACE_LIBS)
 set(ICEBERG_SHARED_INSTALL_INTERFACE_LIBS)
 
-list(APPEND ICEBERG_STATIC_BUILD_INTERFACE_LIBS nanoarrow::nanoarrow)
-list(APPEND ICEBERG_SHARED_BUILD_INTERFACE_LIBS nanoarrow::nanoarrow)
-list(APPEND ICEBERG_STATIC_INSTALL_INTERFACE_LIBS "Iceberg::nanoarrow")
-list(APPEND ICEBERG_SHARED_INSTALL_INTERFACE_LIBS "Iceberg::nanoarrow")
+list(APPEND ICEBERG_STATIC_BUILD_INTERFACE_LIBS nanoarrow::nanoarrow nlohmann_json::nlohmann_json)
+list(APPEND ICEBERG_SHARED_BUILD_INTERFACE_LIBS nanoarrow::nanoarrow nlohmann_json::nlohmann_json)
+list(APPEND ICEBERG_STATIC_INSTALL_INTERFACE_LIBS "Iceberg::nanoarrow" "Iceberg::nlohmann_json")
+list(APPEND ICEBERG_SHARED_INSTALL_INTERFACE_LIBS "Iceberg::nanoarrow" "Iceberg::nlohmann_json")
 
 add_iceberg_lib(iceberg
                 SOURCES

src/iceberg/arrow_c_data_internal.cc

@@ -23,6 +23,8 @@
 #include <string>
 #include <utility>
 
+#include <nlohmann/json.hpp>
+
 namespace iceberg::internal {
 
 std::pair<ArrowSchema, ArrowArray> CreateExampleArrowSchemaAndArrayByNanoarrow() {
@@ -73,4 +75,11 @@ std::pair<ArrowSchema, ArrowArray> CreateExampleArrowSchemaAndArrayByNanoarrow()
   return {out_schema, out_array};
 }
 
+void TestNlohmannJsonCompile() {
+  nlohmann::json j;
+  j["name"] = "foo";
+  j["age"] = 30;
+  j["city"] = "New York";
+}
+
 }  // namespace iceberg::internal