optimized

library/libcares/CMakeLists.txt

@@ -0,0 +1,29 @@
+cmake_minimum_required(VERSION 3.0.0)
+
+project(dns C)
+
+set(PROJECT_VERSION       1.0.0)
+set(PROJECT_VERSION_MAJOR 1)
+set(PROJECT_VERSION_MINOR 0)
+set(PROJECT_VERSION_PATCH 0)
+
+set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_MODULE_PATH})
+
+find_package(PkgConfig REQUIRED)
+
+find_package(CARES REQUIRED)
+
+if (NOT CMAKE_BUILD_TYPE)
+    set(CMAKE_BUILD_TYPE Release)
+endif()
+
+##########################################
+
+add_executable(dns src/dns.c)
+target_link_libraries(dns CARES::libcares)
+
+##########################################
+
+include(GNUInstallDirs)
+
+install(TARGETS dns RUNTIME  DESTINATION ${CMAKE_INSTALL_BINDIR})

library/libcares/FindCARES.cmake

@@ -0,0 +1,43 @@
+if (CARES_INCLUDE_DIRS AND CARES_LIBRARIES)
+    set(CARES_FOUND TRUE)
+else()
+    pkg_check_modules(PKG_CONFIG_CARES QUIET libcares)
+
+    message("PKG_CONFIG_CARES_FOUND=${PKG_CONFIG_CARES_FOUND}")
+    message("PKG_CONFIG_CARES_INCLUDE_DIRS=${PKG_CONFIG_CARES_INCLUDE_DIRS}")
+    message("PKG_CONFIG_CARES_LIBRARY_DIRS=${PKG_CONFIG_CARES_LIBRARY_DIRS}")
+    message("PKG_CONFIG_CARES_INCLUDEDIR=${PKG_CONFIG_CARES_INCLUDEDIR}")
+    message("PKG_CONFIG_CARES_LIBDIR=${PKG_CONFIG_CARES_LIBDIR}")
+    message("PKG_CONFIG_CARES_VERSION=${PKG_CONFIG_CARES_VERSION}")
+    message("PKG_CONFIG_CARES_LIBRARIES=${PKG_CONFIG_CARES_LIBRARIES}")
+    message("PKG_CONFIG_CARES_LINK_LIBRARIES=${PKG_CONFIG_CARES_LINK_LIBRARIES}")
+
+    if (PKG_CONFIG_CARES_FOUND)
+        if (PKG_CONFIG_CARES_INCLUDE_DIRS)
+        	set(CARES_INCLUDE_DIRS "${PKG_CONFIG_CARES_INCLUDE_DIRS}")
+	    elseif (PKG_CONFIG_CARES_INCLUDEDIR)
+        	set(CARES_INCLUDE_DIRS "${PKG_CONFIG_CARES_INCLUDEDIR}")
+	    else()
+		    find_path(CARES_INCLUDE_DIRS cares.h)
+	    endif()
+
+        set(CARES_LIBRARIES ${PKG_CONFIG_CARES_LINK_LIBRARIES})
+
+        if (NOT TARGET  CARES::libcares)
+            add_library(CARES::libcares INTERFACE IMPORTED)
+            set_target_properties(CARES::libcares PROPERTIES
+                INTERFACE_INCLUDE_DIRECTORIES "${CARES_INCLUDE_DIRS}"
+                INTERFACE_LINK_LIBRARIES      "${CARES_LIBRARIES}"
+            )
+        endif()
+
+        if (PKG_CONFIG_CARES_VERSION)
+            set(CARES_VERSION_STRING ${PKG_CONFIG_CARES_VERSION})
+        endif()
+    endif()
+endif()
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(CARES REQUIRED_VARS CARES_LIBRARIES CARES_INCLUDE_DIRS VERSION_VAR CARES_VERSION)
+
+mark_as_advanced(CARES_INCLUDE_DIRS CARES_LIBRARIES)