From 2c590068544d8c2e02a27a8c5a81c12c0dab0dff Mon Sep 17 00:00:00 2001
From: ice-bit <ceticamarco@gmail.com>
Date: Mon, 6 Jul 2020 12:34:55 +0200
Subject: [PATCH] Fixed linkage bug

With the new version of GCC(10.1.0) there was a problem about a
variable definition.
---
 kernel/drivers/timer.c | 3 +--
 kernel/drivers/timer.h | 4 ++--
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/kernel/drivers/timer.c b/kernel/drivers/timer.c
index f6756e3..553e45b 100644
--- a/kernel/drivers/timer.c
+++ b/kernel/drivers/timer.c
@@ -6,7 +6,6 @@
 
 // Start tick at zero
 uint32_t tick = 0;
-
 static void timer_callback(registers_t regs) {
     tick++;
     /* uint8_t buf[8];
@@ -37,4 +36,4 @@ void init_timer(uint32_t frequency) {
     // Send the frequency divisor
     outb(0x40, low);
     outb(0x40, high);
-}
\ No newline at end of file
+}
diff --git a/kernel/drivers/timer.h b/kernel/drivers/timer.h
index 9c1c056..79c9c57 100644
--- a/kernel/drivers/timer.h
+++ b/kernel/drivers/timer.h
@@ -31,11 +31,11 @@
  */
 
 void init_timer(uint32_t frequency);
-uint32_t tick;
+extern uint32_t tick;
 /* Since regs parameter(from timer_callback) will be unused
  * GCC(with -Werror flag) will throw an error, so we can avoid this
  * using the following macro
  */
 #define UNUSED_PAR(x) (void)(x)
 
-#endif
\ No newline at end of file
+#endif