build: do not depend on nasm anymore

Makefile

@@ -306,7 +306,7 @@ $(kernel): $(linker_ld) $(libk_asm_objects) $(libk_c_objects) $(libk_extra_objec
 $(libk_asm_objects): $(libk_objs_dir)/%.o: %.asm
 	$(progress) "CC" $<
 	$(MKDIR) -p $(dir $@)
-	$(ASM) $(KERNEL_ASM_FLAGS) $< -o $@
+	$(CC) $(KERNEL_ASM_FLAGS) $< -o $@
 
 $(libk_c_objects): $(libk_objs_dir)/%.o: %.c
 	$(progress) "CC" $<
@@ -321,7 +321,7 @@ $(libc_c_objects): $(lib_objs_dir)/%.o: %.c
 $(libc_asm_objects): $(lib_objs_dir)/%.o: %.asm
 	$(progress) "CC" $<
 	$(MKDIR) -p $(dir $@)
-	$(ASM) $(LIBC_ASM_FLAGS) $< -o $@
+	$(CC) $(LIBC_ASM_FLAGS) $< -o $@
 
 $(libc): $(libc_asm_objects) $(libc_c_objects) | $(dist_dir)
 	$(progress) "AR" $@
@@ -409,7 +409,6 @@ fmt: ## automatically format the code with clang-format
 
 version: ## print tool versions
 	$(CC) --version
-	$(ASM) --version
 	$(LD) --version
 	$(AR) --version
 	$(QEMU) --version

README.md

@@ -65,7 +65,6 @@ The following dependencies are required to build this project:
 If you want to work on the `x86_64` architecture, you'll need the following
 extra dependencies:
 
-- `nasm`
 - `grub-mkrescue`
 - `xorriso`
 
@@ -134,7 +133,7 @@ depending on the architecture and board configured.
 Install [Homebrew](https://brew.sh/), then run the following commands:
 
 ```
-$ brew install nasm xorriso qemu llvm u-boot-tools
+$ brew install xorriso qemu llvm u-boot-tools
 ```
 
 #### Linux

src/kernel/arch/aarch32/Makefile.include

@@ -14,7 +14,6 @@ log_file         = $(log_dir)/$(ARCH)-$(BOARD)-$(BUILD_MODE).log
 
 QEMU    = qemu-system-arm
 ARM_GCC = arm-none-eabi-gcc
-ASM     = $(CC)
 
 ###############################################################################
 # Options for the different tools

src/kernel/arch/aarch64/Makefile.include

@@ -13,7 +13,6 @@ log_file         = $(log_dir)/$(ARCH)-$(BOARD)-$(BUILD_MODE).log
 ###############################################################################
 
 QEMU = qemu-system-aarch64
-ASM  = $(CC)
 
 ###############################################################################
 # Options for the different tools

src/kernel/arch/x86_64/Makefile.include

@@ -20,7 +20,6 @@ vbe_bpp                = 32
 # Tools
 ###############################################################################
 
-ASM  = nasm
 QEMU = qemu-system-x86_64
 
 ###############################################################################
@@ -60,14 +59,15 @@ libk_extra_objects += $(kernel_console_font)
 # Flags
 ###############################################################################
 
-LD_TARGET        = elf_x86_64
-LIBC_ASM_FLAGS   += -f elf64
-LIBC_CFLAGS      += --target=x86_64 -fstack-protector-strong
+X86_64_CFLAGS    += --target=x86_64
+LIBC_ASM_FLAGS   += -c $(X86_64_CFLAGS)
+LIBC_CFLAGS      += $(X86_64_CFLAGS) -fstack-protector-strong
 LIBC_CFLAGS      += -mno-mmx -mno-sse -mno-sse2 -mno-avx -mno-avx2
-KERNEL_ASM_FLAGS += -f elf64
+KERNEL_ASM_FLAGS += -c $(X86_64_CFLAGS)
 KERNEL_ASM_FLAGS += -dVBE_WIDTH=$(vbe_width) -dVBE_HEIGHT=$(vbe_height) -dVBE_BPP=$(vbe_bpp)
 KERNEL_CFLAGS    += -mno-red-zone
 KERNEL_INCLUDES  += -I$(external_dir)/scalable-font2/
+LD_TARGET        = elf_x86_64
 
 ###############################################################################
 # Arch-specific targets