Suddenly, while rewriting libraries for my project, all of the static variables declared for all libraries in the project gave a warning about being defined but not used. I also get errors for multiple definition of variables inside a header, even though it has guards. Are there any general approaches to solving these issues? I've been trying for a while now, but it doesn't help.
I have tried to trace the issue by excluding libraries/parts of code, but the issue persists.
Header for multiple-definitions part of the code:
/*
* fonts.h
*
* Library of fonts
* Large: 8x8, normal: 5x7 and small: 4x7
*/
#ifndef FONTS_H_
#define FONTS_H_
#include <avr/pgmspace.h>
// Font 8x8 - Large
const unsigned char PROGMEM font8[95][8] = {
{0b00000000,0b00000000,0b00000000,0b00000000,0b00000000,0b00000000,0b00000000,0b00000000}, //
{0b00000000,0b00000110,0b01011111,0b01011111,0b00000110,0b00000000,0b00000000,0b00000000}, // !
{0b00000000,0b00000111,0b00000111,0b00000000,0b00000111,0b00000111,0b00000000,0b00000000}, // "
{0b00010100,0b01111111,0b01111111,0b00010100,0b01111111,0b01111111,0b00010100,0b00000000}, // #
{0b00100100,0b00101110,0b01101011,0b01101011,0b00111010,0b00010010,0b00000000,0b00000000}, // $
{0b01000110,0b01100110,0b00110000,0b00011000,0b00001100,0b01100110,0b01100010,0b00000000}, // %
{0b00110000,0b01111010,0b01001111,0b01011101,0b00110111,0b01111010,0b01001000,0b00000000}, // &
{0b00000100,0b00000111,0b00000011,0b00000000,0b00000000,0b00000000,0b00000000,0b00000000}, // '
{0b00000000,0b00011100,0b00111110,0b01100011,0b01000001,0b00000000,0b00000000,0b00000000}, // (
{0b00000000,0b01000001,0b01100011,0b00111110,0b00011100,0b00000000,0b00000000,0b00000000}, // )
{0b00001000,0b00101010,0b00111110,0b00011100,0b00011100,0b00111110,0b00101010,0b00001000}, // *
{0b00001000,0b00001000,0b00111110,0b00111110,0b00001000,0b00001000,0b00000000,0b00000000}, // +
{0b00000000,0b10100000,0b11100000,0b01100000,0b00000000,0b00000000,0b00000000,0b00000000}, // ,
{0b00001000,0b00001000,0b00001000,0b00001000,0b00001000,0b00001000,0b00000000,0b00000000}, // -
{0b00000000,0b00000000,0b01100000,0b01100000,0b00000000,0b00000000,0b00000000,0b00000000}, // .
{0b01100000,0b00110000,0b00011000,0b00001100,0b00000110,0b00000011,0b00000001,0b00000000}, // /
{0b00111110,0b01111111,0b01011001,0b01001101,0b01111111,0b00111110,0b00000000,0b00000000}, // 0
{0b01000010,0b01000010,0b01111111,0b01111111,0b01000000,0b01000000,0b00000000,0b00000000}, // 1
{0b01100010,0b01110011,0b01011001,0b01001001,0b01101111,0b01100110,0b00000000,0b00000000}, // 2
{0b00100010,0b01100011,0b01001001,0b01001001,0b01111111,0b00110110,0b00000000,0b00000000}, // 3
{0b00011000,0b00011100,0b00010110,0b00010011,0b01111111,0b01111111,0b00010000,0b00000000}, // 4
{0b00100111,0b01100111,0b01000101,0b01000101,0b01111101,0b00111001,0b00000000,0b00000000}, // 5
{0b00111100,0b01111110,0b01001011,0b01001001,0b01111001,0b00110000,0b00000000,0b00000000}, // 6
{0b00000011,0b01100011,0b01110001,0b00011001,0b00001111,0b00000111,0b00000000,0b00000000}, // 7
{0b00110110,0b01111111,0b01001001,0b01001001,0b01111111,0b00110110,0b00000000,0b00000000}, // 8
{0b00000110,0b01001111,0b01001001,0b01101001,0b00111111,0b00011110,0b00000000,0b00000000}, // 9
{0b00000000,0b00000000,0b01101100,0b01101100,0b00000000,0b00000000,0b00000000,0b00000000}, // :
{0b00000000,0b10100000,0b11101100,0b01101100,0b00000000,0b00000000,0b00000000,0b00000000}, // ;
{0b00001000,0b00011100,0b00110110,0b01100011,0b01000001,0b00000000,0b00000000,0b00000000}, // <
{0b00010100,0b00010100,0b00010100,0b00010100,0b00010100,0b00010100,0b00000000,0b00000000}, // =
{0b00000000,0b01000001,0b01100011,0b00110110,0b00011100,0b00001000,0b00000000,0b00000000}, // >
{0b00000010,0b00000011,0b01010001,0b01011001,0b00001111,0b00000110,0b00000000,0b00000000}, // ?
{0b00111110,0b01111111,0b01000001,0b01011101,0b01011101,0b00011111,0b00011110,0b00000000}, // @
{0b01111100,0b01111110,0b00010011,0b00010011,0b01111110,0b01111100,0b00000000,0b00000000}, // A
{0b01000001,0b01111111,0b01111111,0b01001001,0b01001001,0b01111111,0b00110110,0b00000000}, // B
{0b00011100,0b00111110,0b01100011,0b01000001,0b01000001,0b01100011,0b00100010,0b00000000}, // C
{0b01000001,0b01111111,0b01111111,0b01000001,0b01100011,0b01111111,0b00011100,0b00000000}, // D
{0b01000001,0b01111111,0b01111111,0b01001001,0b01011101,0b01000001,0b01100011,0b00000000}, // E
{0b01000001,0b01111111,0b01111111,0b01001001,0b00011101,0b00000001,0b00000011,0b00000000}, // F
{0b00011100,0b00111110,0b01100011,0b01000001,0b01010001,0b01110011,0b01110010,0b00000000}, // G
{0b01111111,0b01111111,0b00001000,0b00001000,0b01111111,0b01111111,0b00000000,0b00000000}, // H
{0b00000000,0b01000001,0b01111111,0b01111111,0b01000001,0b00000000,0b00000000,0b00000000}, // I
{0b00110000,0b01110000,0b01000000,0b01000001,0b01111111,0b00111111,0b00000001,0b00000000}, // J
{0b01000001,0b01111111,0b01111111,0b00001000,0b00011100,0b01110111,0b01100011,0b00000000}, // K
{0b01000001,0b01111111,0b01111111,0b01000001,0b01000000,0b01100000,0b01110000,0b00000000}, // L
{0b01111111,0b01111111,0b00000110,0b00001100,0b00000110,0b01111111,0b01111111,0b00000000}, // M
{0b01111111,0b01111111,0b00000110,0b00001100,0b00011000,0b01111111,0b01111111,0b00000000}, // N
{0b00011100,0b00111110,0b01100011,0b01000001,0b01100011,0b00111110,0b00011100,0b00000000}, // O
{0b01000001,0b01111111,0b01111111,0b01001001,0b00001001,0b00001111,0b00000110,0b00000000}, // P
{0b00011110,0b00111111,0b00100001,0b01110001,0b01111111,0b01011110,0b00000000,0b00000000}, // Q
{0b01000001,0b01111111,0b01111111,0b00011001,0b00111001,0b01101111,0b01000110,0b00000000}, // R
{0b00100110,0b01100111,0b01001101,0b01011001,0b01111011,0b00110010,0b00000000,0b00000000}, // S
{0b00000011,0b01000001,0b01111111,0b01111111,0b01000001,0b00000011,0b00000000,0b00000000}, // T
{0b01111111,0b01111111,0b01000000,0b01000000,0b01111111,0b01111111,0b00000000,0b00000000}, // U
{0b00011111,0b00111111,0b01100000,0b01100000,0b00111111,0b00011111,0b00000000,0b00000000}, // V
{0b01111111,0b01111111,0b00110000,0b00011000,0b00110000,0b01111111,0b01111111,0b00000000}, // W
{0b01100011,0b01110111,0b00011100,0b00001000,0b00011100,0b01110111,0b01100011,0b00000000}, // X
{0b00000111,0b01001111,0b01111000,0b01111000,0b01001111,0b00000111,0b00000000,0b00000000}, // Y
{0b01100111,0b01110011,0b01011001,0b01001101,0b01000111,0b01100011,0b01110001,0b00000000}, // Z
{0b00000000,0b01111111,0b01111111,0b01000001,0b01000001,0b00000000,0b00000000,0b00000000}, // [
{0b00000001,0b00000011,0b00000110,0b00001100,0b00011000,0b00110000,0b01100000,0b00000000}, // "\"
{0b00000000,0b01000001,0b01000001,0b01111111,0b01111111,0b00000000,0b00000000,0b00000000}, // ]
{0b00001000,0b00001100,0b00000110,0b00000011,0b00000110,0b00001100,0b00001000,0b00000000}, // ^
{0b10000000,0b10000000,0b10000000,0b10000000,0b10000000,0b10000000,0b10000000,0b10000000}, // _
{0b00000000,0b00000000,0b00000011,0b00000111,0b00000100,0b00000000,0b00000000,0b00000000}, // `
{0b00100000,0b01110100,0b01010100,0b01010100,0b00111100,0b01111000,0b01000000,0b00000000}, // a
{0b01000001,0b00111111,0b01111111,0b01000100,0b01000100,0b01111100,0b00111000,0b00000000}, // b
{0b00111000,0b01111100,0b01000100,0b01000100,0b01101100,0b00101000,0b00000000,0b00000000}, // c
{0b00110000,0b01111000,0b01001000,0b01001001,0b00111111,0b01111111,0b01000000,0b00000000}, // d
{0b00111000,0b01111100,0b01010100,0b01010100,0b01011100,0b00011000,0b00000000,0b00000000}, // e
{0b01001000,0b01111110,0b01111111,0b01001001,0b00000011,0b00000010,0b00000000,0b00000000}, // f
{0b10011000,0b10111100,0b10100100,0b10100100,0b11111000,0b01111100,0b00000100,0b00000000}, // g
{0b01000001,0b01111111,0b01111111,0b00001000,0b00000100,0b01111100,0b01111000,0b00000000}, // h
{0b00000000,0b01000100,0b01111101,0b01111101,0b01000000,0b00000000,0b00000000,0b00000000}, // i
{0b01000000,0b11000100,0b10000100,0b11111101,0b01111101,0b00000000,0b00000000,0b00000000}, // j
{0b01000001,0b01111111,0b01111111,0b00010000,0b00111000,0b01101100,0b01000100,0b00000000}, // k
{0b00000000,0b01000001,0b01111111,0b01111111,0b01000000,0b00000000,0b00000000,0b00000000}, // l
{0b01111100,0b01111100,0b00001100,0b00011000,0b00001100,0b01111100,0b01111000,0b00000000}, // m
{0b01111100,0b01111100,0b00000100,0b00000100,0b01111100,0b01111000,0b00000000,0b00000000}, // n
{0b00111000,0b01111100,0b01000100,0b01000100,0b01111100,0b00111000,0b00000000,0b00000000}, // o
{0b10000100,0b11111100,0b11111000,0b10100100,0b00100100,0b00111100,0b00011000,0b00000000}, // p
{0b00011000,0b00111100,0b00100100,0b10100100,0b11111000,0b11111100,0b10000100,0b00000000}, // q
{0b01000100,0b01111100,0b01111000,0b01000100,0b00011100,0b00011000,0b00000000,0b00000000}, // r
{0b01001000,0b01011100,0b01010100,0b01010100,0b01110100,0b00100100,0b00000000,0b00000000}, // s
{0b00000000,0b00000100,0b00111110,0b01111111,0b01000100,0b00100100,0b00000000,0b00000000}, // t
{0b00111100,0b01111100,0b01000000,0b01000000,0b00111100,0b01111100,0b01000000,0b00000000}, // u
{0b00011100,0b00111100,0b01100000,0b01100000,0b00111100,0b00011100,0b00000000,0b00000000}, // v
{0b00111100,0b01111100,0b01100000,0b00110000,0b01100000,0b01111100,0b00111100,0b00000000}, // w
{0b01000100,0b01101100,0b00111000,0b00010000,0b00111000,0b01101100,0b01000100,0b00000000}, // x
{0b10011100,0b10111100,0b10100000,0b10100000,0b11111100,0b01111100,0b00000000,0b00000000}, // y
{0b01001100,0b01100100,0b01110100,0b01011100,0b01001100,0b01100100,0b00000000,0b00000000}, // z
{0b00001000,0b00001000,0b00111110,0b01110111,0b01000001,0b01000001,0b00000000,0b00000000}, // {
{0b00000000,0b00000000,0b00000000,0b01110111,0b01110111,0b00000000,0b00000000,0b00000000}, // |
{0b01000001,0b01000001,0b01110111,0b00111110,0b00001000,0b00001000,0b00000000,0b00000000}, // }
{0b00000010,0b00000011,0b00000001,0b00000011,0b00000010,0b00000011,0b00000001,0b00000000}, // ~
};
// Font 5x7 - normal
const unsigned char PROGMEM font5[95][5] = {
{0b00000000,0b00000000,0b00000000,0b00000000,0b00000000}, //
{0b00000000,0b00000000,0b01011111,0b00000000,0b00000000}, // !
{0b00000000,0b00000111,0b00000000,0b00000111,0b00000000}, // "
{0b00010100,0b01111111,0b00010100,0b01111111,0b00010100}, // #
{0b00100100,0b00101010,0b01111111,0b00101010,0b00010010}, // $
{0b00100011,0b00010011,0b00001000,0b01100100,0b01100010}, // %
{0b00110110,0b01001001,0b01010101,0b00100010,0b01010000}, // &
{0b00000000,0b00000101,0b00000011,0b00000000,0b00000000}, // '
{0b00000000,0b00011100,0b00100010,0b01000001,0b00000000}, // (
{0b00000000,0b01000001,0b00100010,0b00011100,0b00000000}, // )
{0b00001000,0b00101010,0b00011100,0b00101010,0b00001000}, // *
{0b00001000,0b00001000,0b00111110,0b00001000,0b00001000}, // +
{0b00000000,0b01010000,0b00110000,0b00000000,0b00000000}, // ,
{0b00001000,0b00001000,0b00001000,0b00001000,0b00001000}, // -
{0b00000000,0b01100000,0b01100000,0b00000000,0b00000000}, // .
{0b00100000,0b00010000,0b00001000,0b00000100,0b00000010}, // /
{0b00111110,0b01010001,0b01001001,0b01000101,0b00111110}, // 0
{0b00000000,0b01000010,0b01111111,0b01000000,0b00000000}, // 1
{0b01000010,0b01100001,0b01010001,0b01001001,0b01000110}, // 2
{0b00100001,0b01000001,0b01000101,0b01001011,0b00110001}, // 3
{0b00011000,0b00010100,0b00010010,0b01111111,0b00010000}, // 4
{0b00100111,0b01000101,0b01000101,0b01000101,0b00111001}, // 5
{0b00111100,0b01001010,0b01001001,0b01001001,0b00110000}, // 6
{0b00000001,0b01110001,0b00001001,0b00000101,0b00000011}, // 7
{0b00110110,0b01001001,0b01001001,0b01001001,0b00110110}, // 8
{0b00000110,0b01001001,0b01001001,0b00101001,0b00011110}, // 9
{0b00000000,0b00110110,0b00110110,0b00000000,0b00000000}, // :
{0b00000000,0b01010110,0b00110110,0b00000000,0b00000000}, // ;
{0b00000000,0b00001000,0b00010100,0b00100010,0b01000001}, // <
{0b00010100,0b00010100,0b00010100,0b00010100,0b00010100}, // =
{0b01000001,0b00100010,0b00010100,0b00001000,0b00000000}, // >
{0b00000010,0b00000001,0b01010001,0b00001001,0b00000110}, // ?
{0b00110010,0b01001001,0b01111001,0b01000001,0b00111110}, // @
{0b01111110,0b00010001,0b00010001,0b00010001,0b01111110}, // A
{0b01111111,0b01001001,0b01001001,0b01001001,0b00110110}, // B
{0b00111110,0b01000001,0b01000001,0b01000001,0b00100010}, // C
{0b01111111,0b01000001,0b01000001,0b00100010,0b00011100}, // D
{0b01111111,0b01001001,0b01001001,0b01001001,0b01000001}, // E
{0b01111111,0b00001001,0b00001001,0b00000001,0b00000001}, // F
{0b00111110,0b01000001,0b01000001,0b01010001,0b00110010}, // G
{0b01111111,0b00001000,0b00001000,0b00001000,0b01111111}, // H
{0b00000000,0b01000001,0b01111111,0b01000001,0b00000000}, // I
{0b00100000,0b01000000,0b01000001,0b00111111,0b00000001}, // J
{0b01111111,0b00001000,0b00010100,0b00100010,0b01000001}, // K
{0b01111111,0b01000000,0b01000000,0b01000000,0b01000000}, // L
{0b01111111,0b00000010,0b00000100,0b00000010,0b01111111}, // M
{0b01111111,0b00000100,0b00001000,0b00010000,0b01111111}, // N
{0b00111110,0b01000001,0b01000001,0b01000001,0b00111110}, // O
{0b01111111,0b00001001,0b00001001,0b00001001,0b00000110}, // P
{0b00111110,0b01000001,0b01010001,0b00100001,0b01011110}, // Q
{0b01111111,0b00001001,0b00011001,0b00101001,0b01000110}, // R
{0b01000110,0b01001001,0b01001001,0b01001001,0b00110001}, // S
{0b00000001,0b00000001,0b01111111,0b00000001,0b00000001}, // T
{0b00111111,0b01000000,0b01000000,0b01000000,0b00111111}, // U
{0b00011111,0b00100000,0b01000000,0b00100000,0b00011111}, // V
{0b01111111,0b00100000,0b00011000,0b00100000,0b01111111}, // W
{0b01100011,0b00010100,0b00001000,0b00010100,0b01100011}, // X
{0b00000011,0b00000100,0b01111000,0b00000100,0b00000011}, // Y
{0b01100001,0b01010001,0b01001001,0b01000101,0b01000011}, // Z
{0b00000000,0b00000000,0b01111111,0b01000001,0b01000001}, // [
{0b00000010,0b00000100,0b00001000,0b00010000,0b00100000}, // "\"
{0b01000001,0b01000001,0b01111111,0b00000000,0b00000000}, // ]
{0b00000100,0b00000010,0b00000001,0b00000010,0b00000100}, // ^
{0b01000000,0b01000000,0b01000000,0b01000000,0b01000000}, // _
{0b00000000,0b00000001,0b00000010,0b00000100,0b00000000}, // `
{0b00100000,0b01010100,0b01010100,0b01010100,0b01111000}, // a
{0b01111111,0b01001000,0b01000100,0b01000100,0b00111000}, // b
{0b00111000,0b01000100,0b01000100,0b01000100,0b00100000}, // c
{0b00111000,0b01000100,0b01000100,0b01001000,0b01111111}, // d
{0b00111000,0b01010100,0b01010100,0b01010100,0b00011000}, // e
{0b00001000,0b01111110,0b00001001,0b00000001,0b00000010}, // f
{0b00001000,0b00010100,0b01010100,0b01010100,0b00111100}, // g
{0b01111111,0b00001000,0b00000100,0b00000100,0b01111000}, // h
{0b00000000,0b01000100,0b01111101,0b01000000,0b00000000}, // i
{0b00100000,0b01000000,0b01000100,0b00111101,0b00000000}, // j
{0b00000000,0b01111111,0b00010000,0b00101000,0b01000100}, // k
{0b00000000,0b01000001,0b01111111,0b01000000,0b00000000}, // l
{0b01111100,0b00000100,0b00011000,0b00000100,0b01111000}, // m
{0b01111100,0b00001000,0b00000100,0b00000100,0b01111000}, // n
{0b00111000,0b01000100,0b01000100,0b01000100,0b00111000}, // o
{0b01111100,0b00010100,0b00010100,0b00010100,0b00001000}, // p
{0b00001000,0b00010100,0b00010100,0b00011000,0b01111100}, // q
{0b01111100,0b00001000,0b00000100,0b00000100,0b00001000}, // r
{0b01001000,0b01010100,0b01010100,0b01010100,0b00100000}, // s
{0b00000100,0b00111111,0b01000100,0b01000000,0b00100000}, // t
{0b00111100,0b01000000,0b01000000,0b00100000,0b01111100}, // u
{0b00011100,0b00100000,0b01000000,0b00100000,0b00011100}, // v
{0b00111100,0b01000000,0b00110000,0b01000000,0b00111100}, // w
{0b01000100,0b00101000,0b00010000,0b00101000,0b01000100}, // x
{0b00001100,0b01010000,0b01010000,0b01010000,0b00111100}, // y
{0b01000100,0b01100100,0b01010100,0b01001100,0b01000100}, // z
{0b00000000,0b00001000,0b00110110,0b01000001,0b00000000}, // {
{0b00000000,0b00000000,0b01111111,0b00000000,0b00000000}, // |
{0b00000000,0b01000001,0b00110110,0b00001000,0b00000000}, // }
{0b00000010,0b00000001,0b00000011,0b00000010,0b00000001}, // ~
};
// Font 4x6 - Small
const unsigned char PROGMEM font4[95][4] = {
{0b00000000,0b00000000,0b00000000,0b00000000}, //
{0b00000000,0b01011100,0b00000000,0b00000000}, // !
{0b00001100,0b00000000,0b00001100,0b00000000}, // "
{0b01111100,0b00101000,0b01111100,0b00101000}, // #
{0b01011000,0b11011100,0b01101000,0b00000000}, // $
{0b00100100,0b00010000,0b01001000,0b00000000}, // %
{0b00101000,0b01010100,0b00101000,0b01000000}, // &
{0b00000000,0b00001100,0b00000000,0b00000000}, // '
{0b00000000,0b01111000,0b10000100,0b00000000}, // (
{0b10000100,0b01111000,0b00000000,0b00000000}, // )
{0b01010100,0b00111000,0b01010100,0b00000000}, // *
{0b00010000,0b01111100,0b00010000,0b00000000}, // +
{0b10000000,0b01000000,0b00000000,0b00000000}, // ,
{0b00010000,0b00010000,0b00010000,0b00000000}, // -
{0b00000000,0b01000000,0b00000000,0b00000000}, // .
{0b01100000,0b00010000,0b00001100,0b00000000}, // /
{0b00111000,0b01010100,0b00111000,0b00000000}, // 0
{0b01001000,0b01111100,0b01000000,0b00000000}, // 1
{0b01001000,0b01100100,0b01011000,0b00000000}, // 2
{0b01000100,0b01010100,0b00101100,0b00000000}, // 3
{0b00011100,0b00010000,0b01111100,0b00000000}, // 4
{0b01011100,0b01010100,0b00100100,0b00000000}, // 5
{0b00111000,0b01010100,0b00100100,0b00000000}, // 6
{0b01100100,0b00010100,0b00001100,0b00000000}, // 7
{0b01101000,0b01010100,0b00101100,0b00000000}, // 8
{0b01001000,0b01010100,0b00111000,0b00000000}, // 9
{0b00000000,0b01001000,0b00000000,0b00000000}, // :
{0b10000000,0b01001000,0b00000000,0b00000000}, // ;
{0b00010000,0b00101000,0b01000100,0b00000000}, // <
{0b00101000,0b00101000,0b00101000,0b00000000}, // =
{0b01000100,0b00101000,0b00010000,0b00000000}, // >
{0b00000100,0b01010100,0b00001000,0b00000000}, // ?
{0b00111000,0b01000100,0b01011100,0b00000000}, // @
{0b01111000,0b00010100,0b01111000,0b00000000}, // A
{0b01111100,0b01010100,0b00101000,0b00000000}, // B
{0b00111000,0b01000100,0b00101000,0b00000000}, // C
{0b01111100,0b01000100,0b00111000,0b00000000}, // D
{0b01111100,0b01010100,0b01000100,0b00000000}, // E
{0b01111100,0b00010100,0b00000100,0b00000000}, // F
{0b00111000,0b01000100,0b01110100,0b00000000}, // G
{0b01111100,0b00010000,0b01111100,0b00000000}, // H
{0b01000100,0b01111100,0b01000100,0b00000000}, // I
{0b00100000,0b01000000,0b00111100,0b00000000}, // J
{0b01111100,0b00010000,0b01101100,0b00000000}, // K
{0b01111100,0b01000000,0b01000000,0b00000000}, // L
{0b01111100,0b00011000,0b01111100,0b00000000}, // M
{0b01111000,0b00010000,0b00111100,0b00000000}, // N
{0b00111000,0b01000100,0b00111000,0b00000000}, // O
{0b01111100,0b00010100,0b00001000,0b00000000}, // P
{0b00111000,0b01000100,0b10111000,0b00000000}, // Q
{0b01111100,0b00010100,0b01101000,0b00000000}, // R
{0b01001000,0b01010100,0b00100100,0b00000000}, // S
{0b00000100,0b01111100,0b00000100,0b00000000}, // T
{0b01111100,0b01000000,0b01111100,0b00000000}, // U
{0b00111100,0b01100000,0b00111100,0b00000000}, // V
{0b01111100,0b00110000,0b01111100,0b00000000}, // W
{0b01101100,0b00010000,0b01101100,0b00000000}, // X
{0b00001100,0b01110000,0b00001100,0b00000000}, // Y
{0b01100100,0b01010100,0b01001100,0b00000000}, // Z
{0b00000000,0b01111100,0b01000100,0b00000000}, // [
{0b00001100,0b00010000,0b01100000,0b00000000}, // "\"
{0b01000100,0b01111100,0b00000000,0b00000000}, // ]
{0b00001000,0b00000100,0b00001000,0b00000000}, // ^
{0b10000000,0b10000000,0b10000000,0b00000000}, // _
{0b00000000,0b00000100,0b00001000,0b00000000}, // `
{0b00110000,0b01001000,0b01111000,0b00000000}, // a
{0b01111100,0b01001000,0b00110000,0b00000000}, // b
{0b00110000,0b01001000,0b01001000,0b00000000}, // c
{0b00110000,0b01001000,0b01111100,0b00000000}, // d
{0b00110000,0b01101000,0b01010000,0b00000000}, // e
{0b00010000,0b01111000,0b00010100,0b00000000}, // f
{0b10010000,0b10101000,0b01111000,0b00000000}, // g
{0b01111100,0b00001000,0b01110000,0b00000000}, // h
{0b01010000,0b01110100,0b01000000,0b00000000}, // i
{0b10000000,0b10000000,0b01110100,0b00000000}, // j
{0b01111100,0b00010000,0b01101000,0b00000000}, // k
{0b01000100,0b01111100,0b01000000,0b00000000}, // l
{0b01111000,0b00010000,0b01111000,0b00000000}, // m
{0b01111000,0b00001000,0b01110000,0b00000000}, // n
{0b00110000,0b01001000,0b00110000,0b00000000}, // o
{0b11111000,0b00101000,0b00010000,0b00000000}, // p
{0b00110000,0b01001000,0b11111000,0b00000000}, // q
{0b01111000,0b00010000,0b00001000,0b00000000}, // r
{0b01010000,0b01011000,0b00101000,0b00000000}, // s
{0b00001000,0b00111100,0b01001000,0b00000000}, // t
{0b00111000,0b01000000,0b01111000,0b00000000}, // u
{0b00111000,0b01000000,0b00111000,0b00000000}, // v
{0b01111000,0b00100000,0b01111000,0b00000000}, // w
{0b01001000,0b00110000,0b01001000,0b00000000}, // x
{0b10011000,0b10100000,0b01111000,0b00000000}, // y
{0b01001000,0b01101000,0b01011000,0b00000000}, // z
{0b00010000,0b01111000,0b10000100,0b00000000}, // {
{0b00000000,0b01111100,0b00000000,0b00000000}, // |
{0b10000100,0b01111000,0b00010000,0b00000000}, // }
{0b00001000,0b00000100,0b00001000,0b00000100}, // ~
};
#endif /* FONTS_H_ */
Its hard to narrow down and give relevant project code since I don't know whats causing the issue.
Edit: Declaring the fonts.h variables in the header and initializing them in a fonts.c-file solved the multiple definition issue. The static-variables 'defined but not used'-issue persists
if a global variable declared static that means it can be used only inside this particular .c file. If the variable is declared but never used, it is a sign of semantic errors in code, and it is fairly marked as a warning.
General approach: just remove unused static variables, or remove static keyword from the declaration.
If you have arrays declared in .h file. That means each time the header file is included, new copies of those variables are created. If they are not declared static that will cause a compilation error. If they are static, then each copy will occupy memory.
To solve this issue, you probably want to have those arrays moved into a .c-file without keyword static:
// inside .c file
const unsigned char PROGMEM font8[95][8] = {
{0b00000000,0b00000000,0b00000000,0b00000000,0b00000000,0b00000000,0b00000000,0b00000000},
...
while in .h-file put just a declaration to those arrays:
// inside .h file
extern const unsigned char PROGMEM font8[95][8];
(note the keyword extern)
That allows you to use the same copy of the array in each .c-file, where that .h is included.