From d50bdd0051f938febd2c6e0bb9d3aa895e9153dc Mon Sep 17 00:00:00 2001
From: kamkow1 <kamkow256@gmail.com>
Date: Sat, 20 Sep 2025 20:07:39 +0200
Subject: [PATCH] Use custom GCC toolchain

---
 Makefile                      | 12 ++++++++++++
 mk/arch/toolchain-x86_64.mk   |  8 +++++---
 mk/user/x86_64.mk             |  1 +
 scripts/build-binutils-gdb.sh | 12 ++++++++++++
 scripts/build-gcc.sh          | 25 +++++++++++++++++++++++++
 5 files changed, 55 insertions(+), 3 deletions(-)
 create mode 100755 scripts/build-binutils-gdb.sh
 create mode 100755 scripts/build-gcc.sh

diff --git a/Makefile b/Makefile
index e2e315c..8c071da 100644
--- a/Makefile
+++ b/Makefile
@@ -17,6 +17,18 @@ prepare:
 		cd limine; \
 		make; \
 	fi
+	if [ ! -d toolchain/binutils-gdb ]; then \
+		cd toolchain; \
+		git clone git://sourceware.org/git/binutils-gdb.git --depth=1; \
+		$(PWD)/scripts/build-binutils-gdb.sh; \
+		cd ..; \
+	fi
+	if [ ! -d toolchain/gcc ]; then \
+		cd toolchain; \
+		git clone https://gcc.gnu.org/git/gcc.git --depth=1; \
+		$(PWD)/scripts/build-gcc.sh; \
+		cd ..; \
+	fi
 
 cleanall:
 	make clean
diff --git a/mk/arch/toolchain-x86_64.mk b/mk/arch/toolchain-x86_64.mk
index 91e60ca..4f4ab31 100644
--- a/mk/arch/toolchain-x86_64.mk
+++ b/mk/arch/toolchain-x86_64.mk
@@ -1,3 +1,5 @@
-CC := x86_64-elf-gcc
-LD := x86_64-elf-ld
-AR := x86_64-elf-ar
+PREFIX := $(ROOT)/toolchain/root/bin
+
+CC := $(PREFIX)/x86_64-elf-gcc
+LD := $(PREFIX)/x86_64-elf-ld
+AR := $(PREFIX)/x86_64-elf-ar
diff --git a/mk/user/x86_64.mk b/mk/user/x86_64.mk
index 79d58fb..9f65ffb 100644
--- a/mk/user/x86_64.mk
+++ b/mk/user/x86_64.mk
@@ -9,4 +9,5 @@ CFLAGS += -m64 \
 					-fno-stack-protector \
 					-fno-stack-check \
 					-fno-builtin \
+					-fno-omit-frame-pointer \
 					-O0 \
diff --git a/scripts/build-binutils-gdb.sh b/scripts/build-binutils-gdb.sh
new file mode 100755
index 0000000..c1fc3b0
--- /dev/null
+++ b/scripts/build-binutils-gdb.sh
@@ -0,0 +1,12 @@
+#!/bin/sh
+
+PREFIX=$(pwd)/root
+
+mkdir build-bintuils-gdb
+cd build-bintuils-gdb
+../binutils-gdb/configure --prefix="$PREFIX" \
+                          --disable-nls \
+                          --disable-werror \
+                          --target=x86_64-elf
+make -j$(nproc)
+make install
diff --git a/scripts/build-gcc.sh b/scripts/build-gcc.sh
new file mode 100755
index 0000000..1e28a7c
--- /dev/null
+++ b/scripts/build-gcc.sh
@@ -0,0 +1,25 @@
+#!/bin/sh
+
+PREFIX=$(pwd)/root
+
+cd gcc
+./contrib/download_prerequisites
+cd ..
+mkdir build-gcc
+cd build-gcc
+../gcc/configure --prefix="$PREFIX" \
+                 --disable-nls \
+                 --enable-languages=c \
+                 --target=x86_64-elf \
+                 --disable-bootstrap \
+                 --without-headers \
+                 --disable-shared \
+                 --disable-threads \
+                 --disable-libssp \
+                 --disable-libquadmath \
+                 --disable-libgomp \
+                 --disable-libatomic \
+                 --disable-libmudflap \
+                 --disable-multilib
+make -j$(nproc)
+make install