Re: [avr-gcc-list] PSTR macro bug in C++

[Theodore A. Roth]

On Fri, 10 Sep 2004, Iztok Zupet wrote:

> Hello
>
>  Just today I discovered a bug. Using the printf_P function and PSTR
> macro causes:
>
> *App.cpp: In member function `void App::dmxScreen()':
> *App.cpp:47: internal compiler error: in simplify_gen_subreg, at
> simplify-rtx.c:3444
> *Please submit a full bug report,
>
> I use avr-gcc V 3.4.1 and avr-libc V 1.0.4.
>
> However, defining PSTR(s) macro as
> #define PSTR(s) ({static char __c[] PROGMEM = (s); &__c[0];})
> instead of
> #define ({static char __c[] PROGMEM = (s); __c;})
> solves this problem.

This is a known problem. See

  http://savannah.nongnu.org/bugs/?func=detailitem&item_id=8633

So, the proposed solutions now are the following:

  #define PSTR(s) ({static char __c[] PROGMEM = (s); &(*__c);})
  #define PSTR(s) ({static char __c[] PROGMEM = (s); &__c[0];})
  #define PSTR(s) ({static char __c[] PROGMEM = (s); (PGM_P)__c;})

The third one seems the most likely to be committed. Any C/C++ gurus
have anything to say on this before I close out the bug (I've been
sitting on this for way too long).

---
Ted Roth
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