[bug #60735] bad declaration example in pgmspace.html

[anonymous]

URL:
  <https://savannah.nongnu.org/bugs/?60735>

                 Summary: bad declaration example in pgmspace.html
                 Project: AVR C Runtime Library
            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: britton.kerin@gmail.com
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 2.0.0
           Fixed Release: None

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Details:

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.





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