How to resolve warning: multi-character character constant in Linux C++

Question

#ifdef WIN32
#   define TARGET_OS \'W_NT\'

I am getting C++ warning in Linux multi-character character constant. at the below line. How to resolve this

Answer 1

String constants use double quotes, single quotes are for character constants.

To suppress the warning if this is what you mean you can use -Wno-multichar gcc option.

Answer 2

Don't define preprocessor constants as strings or chars when testing them in #if. Perhaps coding

#if TARGET_OS_IS_WIN_NT
   /* do something for Windows NT */
#endif

#if TARGET_OS_IS_LINUX
   /* do something for Linux */
#endif

Better yet, consider using multi-system libraries like e.g. Qt -they did all the boring job of handling system specific things and provide you with a nice common API.