Handout

kernel/Makefile

@@ -0,0 +1,36 @@
+# Kernel Makefile
+# try `make help` for more information
+echo=$(shell which echo) -e
+
+# Default target
+.DEFAULT_GOAL = all
+
+# Kernel source files
+LINKER_SCRIPT = compiler/sections.ld
+CC_SOURCES = $(shell find * -name "*.cc" -a ! -name '.*' -a ! -path 'test*' -a ! -path 'fs/tool/*' -a ! -path 'assets/*' -a ! -path 'tools/*')
+ASM_SOURCES = $(shell find * -name "*.asm"  -a ! -name '.*')
+
+# Target files
+KERNEL = $(BUILDDIR)/system
+KERNEL64 = $(KERNEL)64
+ISOFILE = $(BUILDDIR)/stubs.iso
+KERNEL_LINK = $(ROOTBUILDDIR)/system.img
+
+# Include global variables and standard recipes
+include ../tools/common.mk
+
+all: $(KERNEL)
+
+
+# Linking the system image
+# We use the C++ compiler (which calls the actual linker)
+$(KERNEL64): $(ASM_OBJECTS) $(CC_OBJECTS) $(LINKER_SCRIPT) $(MAKEFILE_LIST)
+	@echo "LD		$@"
+	@mkdir -p $(@D)
+	$(VERBOSE) $(CXX) $(CXXFLAGS) -Wl,-T $(LINKER_SCRIPT) -o $@ $(LDFLAGS) $(ASM_OBJECTS) $(CC_OBJECTS)
+	@echo "LN		$(KERNEL_LINK)"
+	$(VERBOSE) ln -sf $(@:$(ROOTBUILDDIR)/%=%) "$(KERNEL_LINK)"
+
+# The kernel must be a 32bit elf for multiboot compliance
+$(KERNEL): $(KERNEL64)
+	$(VERBOSE) $(OBJCOPY) -I elf64-x86-64 -O elf32-i386 $< $@