make: easifier usage of module subdirectories

Many modules have subdirectories. Often these subdirectories should only
be included under certain circumstances. Modules that use submodules
currently need to use this pattern:

```make
DIRS = …

all: $(BINDIR)$(MODULE).a
   @for i in $(DIRS) ; do $(MAKE) -C $$i ; done ;

include $(RIOTBASE)/Makefile.base

clean::
   @for i in $(DIRS) ; do $(MAKE) -C $$i clean ; done ;
```

This PR moves the `all:` and `clean::` boilerplate into `Makefile.base`.

Makefile.base

@@ -4,6 +4,12 @@ endif
 
 MODULE ?= $(shell basename $(CURDIR))
 
+all: $(BINDIR)$(MODULE).a
+	@for i in $(DIRS); do $(MAKE) -C $$i || exit 1; done;
+
+clean::
+	@for i in $(DIRS); do $(MAKE) -C $$i clean; done;
+
 ASMSRC = $(wildcard *.s)
 ASSMSRC = $(wildcard *.S)
 ASMOBJ = $(ASMSRC:%.s=$(BINDIR)$(MODULE)/%.o)

boards/arduino-due/Makefile

@@ -5,12 +5,4 @@ MODULE = $(BOARD)_base
 # add a list of board specific subdirectories that should also be build
 DIRS =
 
-.PHONY: all clean
-
-all: $(BINDIR)$(MODULE).a
-	@for i in $(DIRS) ; do $(MAKE) -C $$i ; done ;
-
 include $(RIOTBASE)/Makefile.base
-
-clean::
-	@for i in $(DIRS) ; do $(MAKE) -C $$i clean ; done ;

boards/avsextrem/Makefile

@@ -2,7 +2,4 @@ MODULE =$(BOARD)_base
 
 DIRS = drivers $(RIOTBOARD)/msba2-common
 
-all: $(BINDIR)$(MODULE).a
-	@for i in $(DIRS) ; do "$(MAKE)" -C $$i || exit 1; done ;
-
 include $(RIOTBASE)/Makefile.base

boards/chronos/Makefile

@@ -3,7 +3,4 @@ MODULE =$(BOARD)_base
 INCLUDES += -I$(RIOTBOARD)/$(BOARD)/drivers/include
 DIRS = drivers
 
-all: $(BINDIR)$(MODULE).a
-	@for i in $(DIRS) ; do "$(MAKE)" -C $$i || exit 1; done ;
-
 include $(RIOTBASE)/Makefile.base

boards/msb-430-common/Makefile

@@ -2,7 +2,4 @@ MODULE =$(BOARD)_base
 
 DIRS = drivers
 
-all: $(BINDIR)$(MODULE).a
-	@for i in $(DIRS) ; do "$(MAKE)" -C $$i || exit 1; done ;
-
 include $(RIOTBASE)/Makefile.base

boards/msb-430/Makefile

@@ -2,7 +2,4 @@ MODULE =$(BOARD)_base
 
 DIRS = $(RIOTBOARD)/msb-430-common
 
-all: $(BINDIR)$(MODULE).a
-	@for i in $(DIRS) ; do "$(MAKE)" -C $$i || exit 1; done ;
-
 include $(RIOTBASE)/Makefile.base

boards/msb-430h/Makefile

@@ -2,7 +2,4 @@ MODULE =$(BOARD)_base
 
 DIRS = $(RIOTBOARD)/msb-430-common
 
-all: $(BINDIR)$(MODULE).a
-	@for i in $(DIRS) ; do "$(MAKE)" -C $$i || exit 1; done ;
-
 include $(RIOTBASE)/Makefile.base

boards/msba2-common/Makefile

@@ -2,7 +2,4 @@ MODULE =$(BOARD)_base
 
 DIRS = drivers
 
-all: $(BINDIR)$(MODULE).a
-	@for i in $(DIRS) ; do "$(MAKE)" -C $$i || exit 1; done ;
-
 include $(RIOTBASE)/Makefile.base

boards/msba2/Makefile

@@ -3,7 +3,4 @@ INCLUDES += -I$(RIOTBASE)/drivers/cc110x
 
 DIRS = $(RIOTBOARD)/msba2-common
 
-all: $(BINDIR)$(MODULE).a
-	@for i in $(DIRS) ; do "$(MAKE)" -C $$i || exit 1; done ;
-
 include $(RIOTBASE)/Makefile.base

boards/native/Makefile

@@ -2,9 +2,6 @@ MODULE =$(BOARD)_base
 
 DIRS = drivers
 
-all: $(BINDIR)$(MODULE).a
-	@for i in $(DIRS) ; do "$(MAKE)" -C $$i || exit 1; done ;
-
 include $(RIOTBASE)/Makefile.base
 
 $(BINDIR)$(MODULE)/%.o: %.c

boards/native/drivers/Makefile

@@ -1,8 +1,5 @@
 MODULE =$(BOARD)_base
 
-all: $(BINDIR)$(MODULE).a
-	@for i in $(DIRS) ; do "$(MAKE)" -C $$i || exit 1; done ;
-
 include $(RIOTBASE)/Makefile.base
 
 $(BINDIR)$(MODULE)/%.o: %.c

boards/pttu/Makefile

@@ -3,7 +3,4 @@ INCLUDES += -I$(RIOTBASE)/drivers/cc110x
 
 DIRS = $(RIOTBOARD)/msba2-common
 
-all: $(BINDIR)$(MODULE).a
-	@for i in $(DIRS) ; do "$(MAKE)" -C $$i || exit 1; done ;
-
 include $(RIOTBASE)/Makefile.base

boards/qemu-i386/Makefile

@@ -2,10 +2,4 @@ MODULE = qemu-i386_base
 
 DIRS = $(RIOTBOARD)/x86-multiboot-common
 
-all: $(BINDIR)$(MODULE).a
-	@for i in $(DIRS) ; do "$(MAKE)" -C $$i ; done ;
-
 include $(RIOTBASE)/Makefile.base
-
-clean::
-	@for i in $(DIRS) ; do "$(MAKE)" -C $$i clean ; done ;

boards/redbee-econotag/Makefile

@@ -2,7 +2,4 @@ MODULE =$(BOARD)_base
 
 DIRS = drivers
 
-all: $(BINDIR)$(MODULE).a
-	@for i in $(DIRS) ; do "$(MAKE)" -C $$i || exit 1; done ;
-
 include $(RIOTBASE)/Makefile.base

boards/udoo/Makefile

@@ -1,16 +1,7 @@
-
 # tell the Makefile.base which module to build
 MODULE = $(BOARD)_base
 
 # add a list of board specific subdirectories that should also be build
 DIRS =
 
-.PHONY: all clean
-
-all: $(BINDIR)$(MODULE).a
-	@for i in $(DIRS) ; do $(MAKE) -C $$i ; done ;
-
 include $(RIOTBASE)/Makefile.base
-
-clean::
-	@for i in $(DIRS) ; do $(MAKE) -C $$i clean ; done ;

boards/wsn430-common/Makefile

@@ -2,7 +2,4 @@ MODULE =$(BOARD)_base
 
 DIRS = drivers
 
-all: $(BINDIR)$(MODULE).a
-	@for i in $(DIRS) ; do "$(MAKE)" -C $$i || exit 1; done ;
-
 include $(RIOTBASE)/Makefile.base

boards/wsn430-v1_3b/Makefile

@@ -2,7 +2,4 @@ MODULE =$(BOARD)_base
 
 DIRS = $(RIOTBOARD)/wsn430-common
 
-all: $(BINDIR)$(MODULE).a
-	@for i in $(DIRS) ; do "$(MAKE)" -C $$i || exit 1; done ;
-
 include $(RIOTBASE)/Makefile.base

boards/wsn430-v1_4/Makefile

@@ -5,7 +5,4 @@ DIRS = $(RIOTBOARD)/wsn430-common
 INCLUDES += -I$(RIOTBASE)/drivers/cc2420/include \
 			-I$(RIOTBASE)/sys/net/include
 
-all: $(BINDIR)$(MODULE).a
-	@for i in $(DIRS) ; do "$(MAKE)" -C $$i || exit 1; done ;
-
 include $(RIOTBASE)/Makefile.base

cpu/cc430/Makefile

@@ -2,7 +2,4 @@ MODULE = cpu
 
 DIRS = $(RIOTCPU)/msp430-common
 
-all: $(BINDIR)$(MODULE).a
-	@for i in $(DIRS) ; do "$(MAKE)" -C $$i || exit 1; done ;
-
 include $(RIOTBASE)/Makefile.base

cpu/lpc1768/Makefile

@@ -7,8 +7,6 @@ CC_SYMBOLS = -DTARGET_LPC1769 -DTOOLCHAIN_GCC_ARM -DNDEBUG -D__CORTEX_M3
 LD_FLAGS = -mcpu=cortex-m3 -mthumb -Wl,--gc-sections,-Map=$(APPLICATION).map,--cref --specs=nano.specs
 LD_SYS_LIBS = -lc -lgcc -lnosys
 
-all: $(BINDIR)$(MODULE).a
-
 include $(RIOTBASE)/Makefile.base
 
 # This is needed for NXP Cortex M devices

cpu/lpc2387/Makefile

@@ -16,7 +16,4 @@ ifneq (,$(filter i2c,$(USEMODULE)))
 	DIRS += i2c
 endif
 
-all: $(BINDIR)$(MODULE).a
-	@for i in $(DIRS) ; do "$(MAKE)" -C $$i || exit 1; done ;
-
 include $(RIOTBASE)/Makefile.base

cpu/mc1322x/Makefile

@@ -11,7 +11,4 @@ ifneq (,$(filter mc1322x,$(USEMODULE)))
 	DIRS += maca
 endif
 
-all: $(BINDIR)$(MODULE).a
-	@for i in $(DIRS) ; do "$(MAKE)" -C $$i || exit 1; done ;
-
 include $(RIOTBASE)/Makefile.base

cpu/msp430x16x/Makefile

@@ -4,7 +4,4 @@ include $(RIOTCPU)/$(CPU)/Makefile.include
 
 DIRS = $(RIOTCPU)/msp430-common/
 
-all: $(BINDIR)$(MODULE).a
-	@for i in $(DIRS) ; do "$(MAKE)" -C $$i || exit 1; done ;
-
 include $(RIOTBASE)/Makefile.base

cpu/native/Makefile

@@ -1,6 +1,5 @@
 MODULE = cpu
 
-DIRS =
 ifneq (,$(filter rtc,$(USEMODULE)))
 	DIRS += rtc
 endif
@@ -8,9 +7,6 @@ ifneq (,$(filter nativenet,$(USEMODULE)))
 	DIRS += net
 endif
 
-all: $(BINDIR)$(MODULE).a
-	@for i in $(DIRS) ; do "$(MAKE)" -C $$i || exit 1; done ;
-
 include $(RIOTBASE)/Makefile.base
 
 $(BINDIR)$(MODULE)/%.o: %.c

cpu/sam3x8e/Makefile

@@ -1,21 +1,7 @@
-
 # define the module that is build
 MODULE = cpu
 
 # add a list of subdirectories, that should also be build
-DIRS = periph
-
-.PHONY: all $(CORTEX_COMMON)
-
-# when building the CPU module make sure, the STM std peripheral lib will also be build
-all: $(CORTEX_COMMON) $(BINDIR)$(MODULE).a
-	@for i in $(DIRS) ; do $(MAKE) -C $$i ; done ;
-
-$(CORTEX_COMMON):
-	@$(MAKE) -C $(CORTEX_COMMON)
+DIRS = periph $(CORTEX_COMMON)
 
 include $(RIOTBASE)/Makefile.base
-
-clean::
-	@for i in $(DIRS) ; do $(MAKE) -C $$i clean ; done ;
-	@$(MAKE) -C $(CORTEX_COMMON) clean

drivers/Makefile

@@ -1,4 +1,3 @@
-DIRS=
 ifneq (,$(filter powermon,$(USEMODULE)))
     DIRS += powermon
 endif
@@ -33,7 +32,4 @@ ifneq (,$(filter lm75a,$(USEMODULE)))
     DIRS += lm75a
 endif
 
-all:
-	@for i in $(DIRS) ; do "$(MAKE)" -C $$i || exit 1; done ;
-
 include $(RIOTBASE)/Makefile.base

drivers/cc110x_ng/Makefile

@@ -1,4 +1,3 @@
-DIRS =
 ifneq (,$(filter msb-430h,$(BOARD)))
 	DIRS += spi
 endif
@@ -9,7 +8,4 @@ ifneq (,$(filter wsn430-v1_3b,$(BOARD)))
 	DIRS += spi
 endif
 
-all: $(BINDIR)$(MODULE).a
-	@for i in $(DIRS) ; do "$(MAKE)" -C $$i || exit 1; done ;
-
 include $(RIOTBASE)/Makefile.base

sys/Makefile

@@ -1,4 +1,3 @@
-MODULE = sys
 ifneq (,$(filter auto_init,$(USEMODULE)))
     DIRS += auto_init
 endif
@@ -93,7 +92,4 @@ ifneq (,$(filter oneway_malloc,$(USEMODULE)))
     DIRS += oneway-malloc
 endif
 
-all: $(BINDIR)$(MODULE).a
-	@for i in $(DIRS) ; do "$(MAKE)" -C $$i || exit 1; done ;
-
 include $(RIOTBASE)/Makefile.base