bugAVR C Runtime Library - Bugs: bug #60735, bad declaration example in...

 
 

bug #60735: bad declaration example in pgmspace.html

Submitted by:  None
Submitted on:  Sat 05 Jun 2021 08:51:34 PM UTC  
 
Category:  Documentation Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Documentation
Status:  None Assigned to:  None
Percent Complete:  0% Originator Email:  -email is unavailable-
Open/Closed:  Open Release:  2.0.0
Fixed Release:  None

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Sat 05 Jun 2021 08:51:34 PM UTC, original submission:  

This page:

  https://www.nongnu.org/avr-libc/user-manual/pgmspace.html

contains this:

  #include <avr/pgmspace.h>
.
.
.
unsigned char mydata[11][10] PROGMEM =
{
    {0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09},
    {0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,0x10,0x11,0x12,0x13},
    {0x14,0x15,0x16,0x17,0x18,0x19,0x1A,0x1B,0x1C,0x1D},
    {0x1E,0x1F,0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27},
    {0x28,0x29,0x2A,0x2B,0x2C,0x2D,0x2E,0x2F,0x30,0x31},
    {0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x3A,0x3B},
    {0x3C,0x3D,0x3E,0x3F,0x40,0x41,0x42,0x43,0x44,0x45},
    {0x46,0x47,0x48,0x49,0x4A,0x4B,0x4C,0x4D,0x4E,0x4F},
    {0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59},
    {0x5A,0x5B,0x5C,0x5D,0x5E,0x5F,0x60,0x61,0x62,0x63},
    {0x64,0x65,0x66,0x67,0x68,0x69,0x6A,0x6B,0x6C,0x6D}
};

With warning options, on avr-gcc (version 7.3.0) this results in this compile error:

main_bootloader.c:28:15: error: variable 'mydata' must be const in order to be put into read-only section by means of '__attribute__((progmem))'

Changing the first line to begin 'unsigned char const' makes the build work (as the error suggests it would).  Since the definition is const it would probably be best to include the const keyword.

Anonymous

 

(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)

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