add depedencies to cxx/CMakeLists.txt (ASIO and spdlog)

cmake/FindASIO.cmake

@@ -0,0 +1,27 @@
+#
+# ASIO
+#
+
+set(ASIO_FOUND FALSE)
+
+find_package(Threads REQUIRED)
+
+find_path(ASIO_DIR asio.hpp HINTS ${ASIO_INSTALL_DIR} PATH_SUFFIXES include)
+
+if (NOT ASIO_DIR)
+    message(WARNING "Cannot find ASIO library headers!")
+    set(ASIO_FOUND FALSE)
+else()
+    message(STATUS "Found ASIO: TRUE (${ASIO_DIR})")
+
+    # ASIO is header-only library so it is IMPORTED target
+    add_library(ASIO::ASIO INTERFACE IMPORTED GLOBAL)
+
+    # set standalone version (do not use Boost)
+    set_target_properties(ASIO::ASIO PROPERTIES INTERFACE_COMPILE_DEFINITIONS "ASIO_STANDALONE" INTERFACE_INCLUDE_DIRECTORIES "${ASIO_DIR}")
+
+    target_link_libraries(ASIO::ASIO INTERFACE Threads::Threads)
+    set(ASIO_FOUND TRUE)
+
+endif()
+