Makefile: some simplification

Makefile

@@ -2,11 +2,11 @@
 CPPFLAGS = -MMD
 AS=nasm
 ASFLAGS += -f elf32
-#LDFLAGS += -m32 -nostdlib -mkernel -fno-stack-protector
-LDFLAGS += -m32 -nostdlib -static -fno-common -fno-use-cxa-atexit -fno-exceptions -fno-non-call-exceptions -fno-weak -fno-rtti -fno-stack-protector
+LDFLAGS += -m elf_i386
 CFLAGS += -m32 -Wall -Wextra -Werror -ffreestanding -fno-exceptions -fno-pie -fno-stack-protector -fno-tree-vectorize
 CXXFLAGS += -m32 -Wall -Wextra -Werror -ffreestanding -fno-exceptions -fno-rtti -fno-pie
 DEBUG_FLAGS += -g -Og -DDEBUG -fno-omit-frame-pointer -fno-inline
+LIBGCC = $(shell $(CC) -print-libgcc-file-name $(CFLAGS))
 
 QEMU_OPT += -hda disk.img
 ARCH?=x86
@@ -24,7 +24,7 @@ cobj=$(csrc:%.c=%.o)
 deps=$(csrc:%.c=%.d) $(gasmsrc:%.S=%.d)
 
 kernel kernel.sym &: $(asmobj) $(gasmobj) $(cobj) linker.ld
-	$(CC) -m32  -ffreestanding -nostdlib $(cobj) $(gasmobj) $(asmobj) -o kernel -T linker.ld -lgcc
+	$(LD) $(LDFLAGS) $(asmobj) $(gasmobj) $(cobj) -o kernel -T linker.ld $(LIBGCC)
 	objcopy --only-keep-debug kernel kernel.sym
 	objcopy --strip-debug  kernel
 
@@ -38,9 +38,11 @@ disk.img: disk.sfdisk
 	qemu-img create -f raw $@ 32M
 	sfdisk $@ < disk.sfdisk
 
+# NASM without preprocessing
 %.o:%.asm
 	$(AS) $(ASFLAGS) -o $@ $<
 
+#GNU GAS ASM with C Preprocessing
 %.o: %.S
 	$(CC) $(CFLAGS) $(CPPFLAGS) -c "$<" -o "$@"
 
@@ -55,9 +57,6 @@ run:kernel disk.img
 debug: CFLAGS += $(DEBUG_FLAGS) -DRUN_TEST
 debug: CXXFLAGS += $(DEBUG_FLAGS)
 debug:kernel kernel.sym
-	#qemu-system-x86_64 -s -S -kernel kernel&
-	#qemu-system-i386 -s -S -kernel kernel&
-	#gdb -s kernel.sym -ex "target remote localhost:1234" -ex "dir core:driver:arch/$(ARCH))'"
 	gdb -q -x debug.gdb
 
 debug_test: CFLAGS += $(DEBUG_FLAGS) -DRUN_TEST

userspace/Makefile

@@ -0,0 +1,2 @@
+# Used to generated .d file that deal with header dependencies
+CPPFLAGS = -MMD