Add hardcoded version support

If can not determine version, this is still better than UNKNOWN

Author: baranyaib90

CMakeLists.txt

@@ -60,11 +60,9 @@ else()
 endif()
 
 if(NOT SW_VERSION)
-  set(SW_VERSION "UNKNOWN")
+  message(WARNING "Version unset, using hardcoded!")
 endif()
 
-message(STATUS "Version is set to: ${SW_VERSION}")
-
 # LIBRARY DEPENDENCIES
 
 find_path(LIBCARES_INCLUDE_DIR ares.h)
@@ -110,9 +108,12 @@ set_property(TARGET ${TARGET_NAME} PROPERTY C_STANDARD 11)
 
 define_file_basename_for_sources("https_dns_proxy")
 
-set_source_files_properties(
-  src/options.c
-  PROPERTIES COMPILE_FLAGS "-DSW_VERSION='\"${SW_VERSION}\"'")
+
+if(SW_VERSION)
+  set_source_files_properties(
+    src/options.c
+    PROPERTIES COMPILE_FLAGS "-DSW_VERSION='\"${SW_VERSION}\"'")
+endif()
 
 if(CLANG_TIDY_EXE)
   set_target_properties(

src/options.c

@@ -22,7 +22,7 @@ const char * options_sw_version() {
 #ifdef SW_VERSION
   return SW_VERSION;
 #else
-  return "UNKNOWN";
+  return "2023.01.01-atLeast";  // update date sometimes, like 1-2 times a year
 #endif
 }