[avr-libc-dev] [patch #7909] Adding __volatile__ to __asm__ within pgmspace header

[Alex Crawford]

URL:
  <http://savannah.nongnu.org/patch/?7909>

                 Summary: Adding __volatile__ to __asm__ within pgmspace
header
                 Project: AVR C Runtime Library
            Submitted by: crawford
            Submitted on: Mon 31 Dec 2012 05:54:17 AM GMT
                Category: None
                Priority: 5 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any

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Details:

I noticed that gcc was optimizing out calls to pgm_read_word_far() that were
within a while loop. Adding the volatile directive fixes the underlying
problem. I've added the directive to each of the LPM and ELPM calls (20 in
all).

The patch was generated from avr-libc-1.8.0.

-Alex



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File Attachments:


-------------------------------------------------------
Date: Mon 31 Dec 2012 05:54:17 AM GMT  Name: volatile.patch  Size: 13kB   By:
crawford
Patch for avr/pgmspace.h
<http://savannah.nongnu.org/patch/download.php?file_id=27168>

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