[Bug c++/81073] [5/6/7/8 Regression] link failure as C++ misses to instanciate some objects

[gjl at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81073

--- Comment #11 from Georg-Johann Lay <gjl at gcc dot gnu.org> ---
...oops, I missed the PROGMEM in PSTR definition.  Should read:

// A string in flash
#define PSTR(str)                                       \
  (__extension__({                                      \
      static const char __c[] PROGMEM  = (str);         \
      &__c[0];                                          \
    }))


but still no error.