On Fri, Mar 31, 2023 at 15:25:02 +0000, RVP wrote: > You have to create an empty file for `-E -dM' to work correctly:
Not necessary, -x c++ is enough, but that's a very common pitfall indeed. # c, despite being called as c++ $ g++ -dM -E - < /dev/null | egrep -i 'stdc|plus' #define __STDC_HOSTED__ 1 #define __STDC_UTF_16__ 1 #define __STDC_VERSION__ 201112L #define __GNUC_STDC_INLINE__ 1 #define __STDC_UTF_32__ 1 #define __STDC__ 1 # needs explicit language selection with -x or an an input file suffix $ gcc -x c++ -dM -E - < /dev/null | egrep -i 'stdc|plus' #define __STDC_HOSTED__ 1 #define __cplusplus 199711L #define __STDC__ 1 -uwe
