From e9b3a12c6e43444f5f6a6e3f63b5e4ece80740eb Mon Sep 17 00:00:00 2001
From: Joel Challis <git@zvecr.com>
Date: Thu, 17 Sep 2020 01:42:24 +0100
Subject: [PATCH] Fix ssd1306 compilation on avr-gcc 10 (#9267)

---
 drivers/avr/ssd1306.c                   | 2 ++
 drivers/avr/ssd1306.h                   | 2 +-
 keyboards/claw44/ssd1306.c              | 2 ++
 keyboards/claw44/ssd1306.h              | 2 +-
 keyboards/comet46/ssd1306.c             | 2 ++
 keyboards/comet46/ssd1306.h             | 2 +-
 keyboards/crkbd/ssd1306.c               | 2 ++
 keyboards/crkbd/ssd1306.h               | 2 +-
 keyboards/helix/local_drivers/ssd1306.c | 2 ++
 keyboards/helix/local_drivers/ssd1306.h | 2 +-
 keyboards/yosino58/ssd1306.c            | 2 ++
 keyboards/yosino58/ssd1306.h            | 2 +-
 12 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/drivers/avr/ssd1306.c b/drivers/avr/ssd1306.c
index 205f749502b8..1a09a2bcb789 100644
--- a/drivers/avr/ssd1306.c
+++ b/drivers/avr/ssd1306.c
@@ -11,6 +11,8 @@
 #    include "sendchar.h"
 #    include "timer.h"
 
+struct CharacterMatrix display;
+
 // Set this to 1 to help diagnose early startup problems
 // when testing power-on with ble.  Turn it off otherwise,
 // as the latency of printing most of the debug info messes
diff --git a/drivers/avr/ssd1306.h b/drivers/avr/ssd1306.h
index 9669d1b7e77e..9131afcf6122 100644
--- a/drivers/avr/ssd1306.h
+++ b/drivers/avr/ssd1306.h
@@ -66,7 +66,7 @@ struct CharacterMatrix {
     bool     dirty;
 };
 
-struct CharacterMatrix display;
+extern struct CharacterMatrix display;
 
 bool iota_gfx_init(void);
 void iota_gfx_task(void);
diff --git a/keyboards/claw44/ssd1306.c b/keyboards/claw44/ssd1306.c
index e04a431357c3..7dea1cc176f0 100644
--- a/keyboards/claw44/ssd1306.c
+++ b/keyboards/claw44/ssd1306.c
@@ -10,6 +10,8 @@
 #include "sendchar.h"
 #include "timer.h"
 
+struct CharacterMatrix display;
+
 extern const unsigned char font[] PROGMEM;
 
 // Set this to 1 to help diagnose early startup problems
diff --git a/keyboards/claw44/ssd1306.h b/keyboards/claw44/ssd1306.h
index 0ca093093a17..11a3cc67f449 100644
--- a/keyboards/claw44/ssd1306.h
+++ b/keyboards/claw44/ssd1306.h
@@ -65,7 +65,7 @@ struct CharacterMatrix {
   bool dirty;
 };
 
-struct CharacterMatrix display;
+extern struct CharacterMatrix display;
 
 bool iota_gfx_init(bool rotate);
 void iota_gfx_task(void);
diff --git a/keyboards/comet46/ssd1306.c b/keyboards/comet46/ssd1306.c
index abbed4a49fb9..4bd2d80bc4d4 100644
--- a/keyboards/comet46/ssd1306.c
+++ b/keyboards/comet46/ssd1306.c
@@ -10,6 +10,8 @@
 #include "sendchar.h"
 #include "timer.h"
 
+struct CharacterMatrix display;
+
 extern const unsigned char font[] PROGMEM;
 
 // Set this to 1 to help diagnose early startup problems
diff --git a/keyboards/comet46/ssd1306.h b/keyboards/comet46/ssd1306.h
index 0ca093093a17..11a3cc67f449 100644
--- a/keyboards/comet46/ssd1306.h
+++ b/keyboards/comet46/ssd1306.h
@@ -65,7 +65,7 @@ struct CharacterMatrix {
   bool dirty;
 };
 
-struct CharacterMatrix display;
+extern struct CharacterMatrix display;
 
 bool iota_gfx_init(bool rotate);
 void iota_gfx_task(void);
diff --git a/keyboards/crkbd/ssd1306.c b/keyboards/crkbd/ssd1306.c
index b2676f386f24..4ec8a9a00f0a 100644
--- a/keyboards/crkbd/ssd1306.c
+++ b/keyboards/crkbd/ssd1306.c
@@ -10,6 +10,8 @@
 #include "sendchar.h"
 #include "timer.h"
 
+struct CharacterMatrix display;
+
 extern const unsigned char font[] PROGMEM;
 
 #ifndef OLED_BLANK_CHAR
diff --git a/keyboards/crkbd/ssd1306.h b/keyboards/crkbd/ssd1306.h
index 0ca093093a17..11a3cc67f449 100644
--- a/keyboards/crkbd/ssd1306.h
+++ b/keyboards/crkbd/ssd1306.h
@@ -65,7 +65,7 @@ struct CharacterMatrix {
   bool dirty;
 };
 
-struct CharacterMatrix display;
+extern struct CharacterMatrix display;
 
 bool iota_gfx_init(bool rotate);
 void iota_gfx_task(void);
diff --git a/keyboards/helix/local_drivers/ssd1306.c b/keyboards/helix/local_drivers/ssd1306.c
index 00b2fb0eec36..c6fc4b78544f 100644
--- a/keyboards/helix/local_drivers/ssd1306.c
+++ b/keyboards/helix/local_drivers/ssd1306.c
@@ -16,6 +16,8 @@
 #include "sendchar.h"
 #include "timer.h"
 
+struct CharacterMatrix display;
+
 // Set this to 1 to help diagnose early startup problems
 // when testing power-on with ble.  Turn it off otherwise,
 // as the latency of printing most of the debug info messes
diff --git a/keyboards/helix/local_drivers/ssd1306.h b/keyboards/helix/local_drivers/ssd1306.h
index f9f91c6fedf5..bcb30f88595d 100644
--- a/keyboards/helix/local_drivers/ssd1306.h
+++ b/keyboards/helix/local_drivers/ssd1306.h
@@ -66,7 +66,7 @@ struct CharacterMatrix {
   bool dirty;
 };
 
-struct CharacterMatrix display;
+extern struct CharacterMatrix display;
 
 bool iota_gfx_init(bool rotate);
 void iota_gfx_task(void);
diff --git a/keyboards/yosino58/ssd1306.c b/keyboards/yosino58/ssd1306.c
index ff6ba210d1fb..abd9de2f7a08 100644
--- a/keyboards/yosino58/ssd1306.c
+++ b/keyboards/yosino58/ssd1306.c
@@ -10,6 +10,8 @@
 #include "sendchar.h"
 #include "timer.h"
 
+struct CharacterMatrix display;
+
 extern const unsigned char font[] PROGMEM;
 
 // Set this to 1 to help diagnose early startup problems
diff --git a/keyboards/yosino58/ssd1306.h b/keyboards/yosino58/ssd1306.h
index acaf6217ef05..35e4c144cc7b 100644
--- a/keyboards/yosino58/ssd1306.h
+++ b/keyboards/yosino58/ssd1306.h
@@ -70,7 +70,7 @@ struct CharacterMatrix {
   bool dirty;
 };
 
-struct CharacterMatrix display;
+extern struct CharacterMatrix display;
 
 bool iota_gfx_init(bool rotate);
 void iota_gfx_task(void);