[avr-libc-dev] [bug #33716] pgmspace typedefs not legal

[Georg-Johann Lay]

Follow-up Comment #1, bug #33716 (project avr-libc):

As Bill already wrote, attribute progmem just works by accident in avr-gcc (
and not at all in avr-g++).

It appears that
   const prog_char c = 'a';
works for C and not for C++.  However, there is *no* support for progmem in
types it in avr-gcc and there is no guarantee that it will work for any code
imagineable.

I highly recommend to deprecate types like prog_char:

typedef char __attribute__((progmem,deprecated)) prog_char;

or 

typedef char __attribute__((progmem,deprecated("message"))) prog_char;

Notice that despite "progmem", "deprecated" *is* documented for types.

As the next release of avr-libc will come with bulk of poison, anyway, this
bit of deprecation won't hurt and will help users to write more robust code.

Johann


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