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.ke...@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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