Improve buildsystem by making build directory

We now create build directory for kernel and libc so that source
directories are kept more clean.

.gitignore

@@ -2,3 +2,4 @@
 isodir
 sysroot
 .vscode/
+.idea/

kernel/Makefile

@@ -13,8 +13,8 @@ EXEC_PREFIX?=$(PREFIX)
 BOOTDIR?=$(EXEC_PREFIX)/boot
 INCLUDEDIR?=$(PREFIX)/include
  
-CFLAGS:=$(CFLAGS) -fstack-protector -ffreestanding -Wall -Wextra -Wno-unused-function
+CFLAGS:=$(CFLAGS) -D__is_kernel -Iinclude -fstack-protector -ffreestanding -Wall -Wextra -Wno-unused-function
-CPPFLAGS:=$(CPPFLAGS) -D__is_kernel -Iinclude
+CPPFLAGS:=$(CPPFLAGS)
 LDFLAGS:=$(LDFLAGS)
 LIBS:=$(LIBS) -nostdlib -lk -lgcc
  
@@ -27,6 +27,8 @@ CPPFLAGS:=$(CPPFLAGS) $(KERNEL_ARCH_CPPFLAGS)
 LDFLAGS:=$(LDFLAGS) $(KERNEL_ARCH_LDFLAGS)
 LIBS:=$(LIBS) $(KERNEL_ARCH_LIBS)
 
+BUILDDIR=$(abspath build)
+ 
 KERNEL_OBJS=\
 $(KERNEL_ARCH_OBJS) \
 kernel/GDT.o \
@@ -51,28 +53,30 @@ $(LIBS) \
 $(ARCHDIR)/crtend.o \
 $(ARCHDIR)/crtn.o \
  
-.PHONY: all clean install install-headers install-kernel
+.PHONY: all always clean install install-headers install-kernel
 .SUFFIXES: .o .cpp .S
  
 all: banan-os.kernel
  
-banan-os.kernel: $(OBJS) $(ARCHDIR)/linker.ld
+banan-os.kernel: always $(OBJS) $(ARCHDIR)/linker.ld
-	$(CXX) -T $(ARCHDIR)/linker.ld -o $@ $(CFLAGS) $(CPPFLAGS) $(LINK_LIST)
+	cd $(BUILDDIR) && $(CC) -T ../$(ARCHDIR)/linker.ld -o banan-os.kernel $(CFLAGS) $(LINK_LIST)
-	grub-file --is-x86-multiboot banan-os.kernel
+	cd $(BUILDDIR) && grub-file --is-x86-multiboot banan-os.kernel
  
 $(ARCHDIR)/crtbegin.o $(ARCHDIR)/crtend.o:
-	OBJ=`$(CXX) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) -print-file-name=$(@F)` && cp "$$OBJ" $@
+	OBJ=`$(CC) $(CFLAGS) $(LDFLAGS) -print-file-name=$(@F)` && cp "$$OBJ" $(BUILDDIR)/$@
 
 .cpp.o:
-	$(CXX) -MD -c $< -o $@ $(CFLAGS) $(CPPFLAGS)
+	$(CXX) -MD -c $< -o $(BUILDDIR)/$@ $(CFLAGS) $(CPPFLAGS)
  
 .S.o:
-	$(CXX) -MD -c $< -o $@ $(CFLAGS) $(CPPFLAGS)
+	$(CC) -MD -c $< -o $(BUILDDIR)/$@ $(CFLAGS)
+ 
+always:
+	mkdir -p $(BUILDDIR)/arch/i386
+	mkdir -p $(BUILDDIR)/kernel
 
 clean:
-	rm -f banan-os.kernel
+	rm -rf $(BUILDDIR)
-	rm -f $(OBJS) *.o */*.o */*/*.o
-	rm -f $(OBJS:.o=.d) *.d */*.d */*/*.d
 
 install: install-headers install-kernel
  
@@ -82,6 +86,6 @@ install-headers:
  
 install-kernel: banan-os.kernel
 	mkdir -p $(DESTDIR)$(BOOTDIR)
-	cp banan-os.kernel $(DESTDIR)$(BOOTDIR)
+	cp $(BUILDDIR)/banan-os.kernel $(DESTDIR)$(BOOTDIR)
  
 -include $(OBJS:.o=.d)

libc/Makefile

@@ -13,8 +13,8 @@ EXEC_PREFIX?=$(PREFIX)
 INCLUDEDIR?=$(PREFIX)/include
 LIBDIR?=$(EXEC_PREFIX)/lib
  
-CFLAGS:=$(CFLAGS) -ffreestanding -Wall -Wextra
+CFLAGS:=$(CFLAGS) -D__is_libc -Iinclude -ffreestanding -Wall -Wextra
-CPPFLAGS:=$(CPPFLAGS) -D__is_libc -Iinclude
+CPPFLAGS:=$(CPPFLAGS)
 LIBK_CFLAGS:=$(CFLAGS)
 LIBK_CPPFLAGS:=$(CPPFLAGS) -D__is_libk
  
@@ -27,6 +27,8 @@ CPPFLAGS:=$(CPPFLAGS) $(ARCH_CPPFLAGS)
 LIBK_CFLAGS:=$(LIBK_CFLAGS) $(KERNEL_ARCH_CFLAGS)
 LIBK_CPPFLAGS:=$(LIBK_CPPFLAGS) $(KERNEL_ARCH_CPPFLAGS)
  
+BUILDDIR=$(abspath build)
+ 
 FREEOBJS=\
 $(ARCH_FREEOBJS) \
 stdio/printf.o \
@@ -54,33 +56,36 @@ LIBK_OBJS=$(FREEOBJS:.o=.libk.o)
 #BINARIES=libc.a libk.a # Not ready for libc yet.
 BINARIES=libk.a
  
-.PHONY: all clean install install-headers install-libs
+.PHONY: all always clean install install-headers install-libs
 .SUFFIXES: .o .libk.o .cpp .S
  
 all: $(BINARIES)
  
-libc.a: $(OBJS)
+libc.a: always $(OBJS)
-	$(AR) rcs $@ $(OBJS)
+	cd $(BUILDDIR) && $(AR) rcs $@ $(OBJS)
  
-libk.a: $(LIBK_OBJS)
+libk.a: always $(LIBK_OBJS)
-	$(AR) rcs $@ $(LIBK_OBJS)
+	cd $(BUILDDIR) && $(AR) rcs $@ $(LIBK_OBJS)
  
 .cpp.o:
-	$(CXX) -MD -c $< -o $@ $(CFLAGS) $(CPPFLAGS)
+	$(CXX) -MD -c $< -o $(BUILDDIR)/$@ $(CFLAGS) $(CPPFLAGS)
  
 .S.o:
-	$(CXX) -MD -c $< -o $@ $(CFLAGS) $(CPPFLAGS)
+	$(CXX) -MD -c $< -o $(BUILDDIR)/$@ $(CFLAGS) $(CPPFLAGS)
  
 .cpp.libk.o:
-	$(CXX) -MD -c $< -o $@ $(LIBK_CFLAGS) $(LIBK_CPPFLAGS)
+	$(CXX) -MD -c $< -o $(BUILDDIR)/$@ $(LIBK_CFLAGS) $(LIBK_CPPFLAGS)
  
 .S.libk.o:
-	$(CXX) -MD -c $< -o $@ $(LIBK_CFLAGS) $(LIBK_CPPFLAGS)
+	$(CXX) -MD -c $< -o $(BUILDDIR)/$@ $(LIBK_CFLAGS) $(LIBK_CPPFLAGS)
  
 clean:
-	rm -f $(BINARIES) *.a
+	rm -rf $(BUILDDIR)
-	rm -f $(OBJS) $(LIBK_OBJS) *.o */*.o */*/*.o
+ 
-	rm -f $(OBJS:.o=.d) $(LIBK_OBJS:.o=.d) *.d */*.d */*/*.d
+always:
+	mkdir -p $(BUILDDIR)/stdio
+	mkdir -p $(BUILDDIR)/stdlib
+	mkdir -p $(BUILDDIR)/string
  
 install: install-headers install-libs
  
@@ -90,7 +95,7 @@ install-headers:
  
 install-libs: $(BINARIES)
 	mkdir -p $(DESTDIR)$(LIBDIR)
-	cp $(BINARIES) $(DESTDIR)$(LIBDIR)
+	cp $(BUILDDIR)/$(BINARIES) $(DESTDIR)$(LIBDIR)
  
 -include $(OBJS:.o=.d)
 -include $(LIBK_OBJS:.o=.d)