make em make less make, cuz makin' make ain't make no fun

.clang-tidy

@@ -23,4 +23,4 @@ Checks: >
   -cppcoreguidelines-pro-*,
 CheckOptions:
   readability-simplify-boolean-expr.IgnoreMacros: 'true'
-  readability-identifier-length.IgnoreNames: 'me'
+  readability-identifier-length.IgnoreNames: 'g,me'

.gitignore

@@ -1,2 +1 @@
-.build*
+build/
-/build*

user/Makefile

@@ -13,8 +13,31 @@ INITRD = $(BUILDDIR)/initrd.img
 
 all: $(INITRD)
 
+# Rezepte fuer Apps (Unterverzeichnisse)
+$(APPS): $(BUILDDIR)/init.o
+	$(VERBOSE) $(MAKE) -C $@ -f ../Makefile.app
+
+# recipe for compiling imgbuilder
+$(IMGBUILDER): imgbuilder.cc $(MAKEFILE_LIST)
+	@echo "CC		$@"
+	@if test \( ! \( -d $(@D) \) \) ;then mkdir -p $(@D);fi
+	$(VERBOSE) $(CXX) -std=c++23 -o $@ $<
+
 # recipe for building the final oostubs image
-$(INITRD):
+$(INITRD): $(APPS) $(IMGBUILDER)
 	@echo "IMGBUILD	$@"
-	@mkdir -p $(@D)
+	@if test \( ! \( -d $(@D) \) \) ;then mkdir -p $(@D);fi
-	@touch $@
+	$(VERBOSE) $(IMGBUILDER) $(addsuffix $(BUILDDIR)/app.img, $(APPS)) > $@
+
+lint::
+	$(VERBOSE) $(foreach APP,$(APPS),$(MAKE) -C $(APP) -f ../Makefile.app lint && ) true
+
+tidy::
+	$(VERBOSE) $(foreach APP,$(APPS),$(MAKE) -C $(APP) -f ../Makefile.app tidy && ) true
+
+# clean all apps additionally to default clean recipe from common.mk
+clean::
+	$(VERBOSE) $(foreach APP,$(APPS),$(MAKE) -C $(APP) -f ../Makefile.app clean && ) true
+
+.PHONY: all clean $(APPS)
+

user/Makefile.app

@@ -0,0 +1,53 @@
+# --------------------------------------------------------------------------
+# Linker Script
+LINKER_SCRIPT = ../sections.ld
+# Files to be compiled (important: defined prior to importing common.mk!)
+CC_SOURCES = $(shell find * -name "*.cc" -a ! -name '.*' )
+ASM_SOURCES = $(shell find * -name "*.asm"  -a ! -name '.*' )
+
+CXXFLAGS_INCLUDE =  -I../../libsys -I../../kernel
+CXXFLAGS_DEFAULT += $(CXXFLAGS_INCLUDE)
+
+# -----------------------------------------------------------------------------
+# Globale Variablen und Standard-Rezepte einbinden
+include ../../tools/common.mk
+
+# --------------------------------------------------------------------------
+# Default target
+
+.DEFAULT_GOAL = all
+all: $(BUILDDIR)/app.img
+
+# -----------------------------------------------------------------------------
+# Parameters & flags:
+
+CXXFLAGS += $(CXXFLAGS_INCLUDE)
+# Enable 16-byte compare-and-exchange instruction for debugging purposes (stack alignment)
+CXXFLAGS += -mcx16
+
+LDLIBS += -L../../libsys/$(BUILDDIR) -lsys
+INITOBJ = ../$(BUILDDIR)/init.o
+
+# --------------------------------------------------------------------------
+# Linked applications
+$(BUILDDIR)/app: $(INITOBJ)  $(ASM_OBJECTS) $(CC_OBJECTS) $(LINKER_SCRIPT) $(MAKEFILE_LIST)
+	@echo "LD		$@"
+	@mkdir -p $(@D)
+	$(VERBOSE) $(CXX) $(CXXFLAGS) -Wl,-T $(LINKER_SCRIPT) -o $@ $(LDFLAGS) $(INITOBJ) $(ASM_OBJECTS) $(CC_OBJECTS) $(LDLIBS)
+
+# --------------------------------------------------------------------------
+# 'app.img' contains all section required for loading an application (flat binary)
+
+$(BUILDDIR)/app.img: $(BUILDDIR)/app
+	@echo "OBJCOPY		$@"
+	@if ! nm $< | grep "4000000 T start" >/dev/null 2>&1 ; then echo "Symbol 'start' is not first address" ; exit 1 ; fi
+	@if test \( ! \( -d $(@D) \) \) ;then mkdir -p $(@D);fi
+	$(VERBOSE) objcopy -O binary --set-section-flags .bss=alloc,load,contents $< $@
+
+# --------------------------------------------------------------------------
+# Include dependency files (generated gcc -MM)
+
+ifneq ($(MAKECMDGOALS),clean)
+-include $(DEP_FILES)
+endif
+