From 878ca00f188a9929df6bd3d34224d654bbca092a Mon Sep 17 00:00:00 2001
From: mintsuki <mintsuki@protonmail.com>
Date: Sun, 17 Sep 2023 23:16:50 -0500
Subject: [PATCH] Update

---
 GNUmakefile     | 17 +++++++++++++++--
 kernel/kernel.c |  2 +-
 2 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/GNUmakefile b/GNUmakefile
index bfed9bf..8020942 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -13,9 +13,17 @@ define DEFAULT_VAR =
     endif
 endef
 
-# Compiler for building the 'limine' executable for the host.
+# Toolchain for building the 'limine' executable for the host.
 override DEFAULT_HOST_CC := cc
 $(eval $(call DEFAULT_VAR,HOST_CC,$(DEFAULT_HOST_CC)))
+override DEFAULT_HOST_CFLAGS := -g -O2 -pipe
+$(eval $(call DEFAULT_VAR,HOST_CFLAGS,$(DEFAULT_HOST_CFLAGS)))
+override DEFAULT_HOST_CPPFLAGS :=
+$(eval $(call DEFAULT_VAR,HOST_CPPFLAGS,$(DEFAULT_HOST_CPPFLAGS)))
+override DEFAULT_HOST_LDFLAGS :=
+$(eval $(call DEFAULT_VAR,HOST_LDFLAGS,$(DEFAULT_HOST_LDFLAGS)))
+override DEFAULT_HOST_LIBS :=
+$(eval $(call DEFAULT_VAR,HOST_LIBS,$(DEFAULT_HOST_LIBS)))
 
 .PHONY: all
 all: $(IMAGE_NAME).iso
@@ -45,7 +53,12 @@ ovmf:
 
 limine:
 	git clone https://github.com/limine-bootloader/limine.git --branch=v5.x-branch-binary --depth=1
-	unset CC; unset CFLAGS; unset CPPFLAGS; unset LDFLAGS; unset LIBS; $(MAKE) -C limine CC="$(HOST_CC)"
+	$(MAKE) -C limine \
+		CC="$(HOST_CC)" \
+		CFLAGS="$(HOST_CFLAGS)" \
+		CPPFLAGS="$(HOST_CPPFLAGS)" \
+		LDFLAGS="$(HOST_LDFLAGS)" \
+		LIBS="$(HOST_LIBS)"
 
 .PHONY: kernel
 kernel:
diff --git a/kernel/kernel.c b/kernel/kernel.c
index 3ae1576..4d5fc7c 100644
--- a/kernel/kernel.c
+++ b/kernel/kernel.c
@@ -91,7 +91,7 @@ void _start(void) {
 
     // Note: we assume the framebuffer model is RGB with 32-bit pixels.
     for (size_t i = 0; i < 100; i++) {
-        uint32_t *fb_ptr = framebuffer->address;
+        volatile uint32_t *fb_ptr = framebuffer->address;
         fb_ptr[i * (framebuffer->pitch / 4) + i] = 0xffffff;
     }