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Date: Thu, 18 Dec 2003 06:47:00 -0000
From: "ken at realtronix dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Message-ID: <20031218064547.13428.ken@realtronix.net>
Reply-To: gcc-bugzilla@gcc.gnu.org
Subject: [Bug c/13428] New: gcc-avr doesn't work properly with PGM string
X-Bugzilla-Reason: CC
X-SW-Source: 2003-12/txt/msg01877.txt.bz2
List-Id: <gcc-bugs.sourceware.org>

gcc version as:
Configured with: ../configure --prefix=/e/avrdev/install --target=avr --enable-
languages=c,c++ --disable-nls --enable-win32-registry=WinAVR
Thread model: single
gcc version 3.3.1

demo program as:

#include <avr/io.h>
#include <avr/pgmspace.h>
#include <string.h>

const char foo[] PROGMEM = "foo";
const char bar[] PROGMEM = "bar";

PGM_P  Langs[2] PROGMEM = {foo, bar};

int main(void)
{
  unsigned char i;
  char buf[2][5];
  
  //strcpy_P works fine with constant index
  strcpy_P(buf[0], Langs[0]);  //correctly copy 'foo'
  strcpy_P(buf[1], Langs[1]);  //correctly copy 'bar'
  
  //but strcpy_P copy char from wrong address if use variable indexing
  for (i=0; i<2; i++)
    strcpy_P(buf[i], Langs[i]);  //copy garbages!!!

  return 1;
}

-- 
           Summary: gcc-avr doesn't work properly with PGM string
           Product: gcc
           Version: 3.3.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ken at realtronix dot net
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13428