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Makefile: compile and link each module just once

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Several source files need to be compiled and linked when one or more
config options are selected. To allow for easy selection in the
Makefiles yet to avoild multiple compilation (which costs build time)
and especially multiple linking (which causes errors), we use
"COBJS = $(sort COBJS-y)" which eliminates duplicates.

By courtesy of Detlev Zundel who suggested this approach.

Signed-off-by: Wolfgang Denk <wd@denx.de>
This commit is contained in:
Wolfgang Denk 2008-09-09 15:45:18 +02:00
parent 48d0192fe8
commit 47ffd6c2fc
3 changed files with 9 additions and 8 deletions
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9
common/Makefile
View file

@ -56,7 +56,8 @@ COBJS-y += env_nowhere.o
# command
COBJS-$(CONFIG_CMD_AMBAPP) += cmd_ambapp.o
COBJS-$(CONFIG_AUTOSCRIPT)$(CONFIG_CMD_AUTOSCRIPT) += cmd_autoscript.o
COBJS-$(CONFIG_AUTOSCRIPT) += cmd_autoscript.o
COBJS-$(CONFIG_CMD_AUTOSCRIPT) += cmd_autoscript.o
COBJS-$(CONFIG_CMD_BDI) += cmd_bdinfo.o
COBJS-$(CONFIG_CMD_BEDBUG) += bedbug.o cmd_bedbug.o
COBJS-$(CONFIG_CMD_BMP) += cmd_bmp.o
@ -110,7 +111,8 @@ COBJS-$(CONFIG_LOGBUFFER) += cmd_log.o
COBJS-y += cmd_mac.o
COBJS-y += cmd_mem.o
COBJS-$(CONFIG_CMD_MFSL) += cmd_mfsl.o
COBJS-$(CONFIG_MII)$(CONFIG_CMD_MII) += miiphyutil.o
COBJS-$(CONFIG_MII) += miiphyutil.o
COBJS-$(CONFIG_CMD_MII) += miiphyutil.o
COBJS-$(CONFIG_CMD_MII) += cmd_mii.o
COBJS-$(CONFIG_CMD_MISC) += cmd_misc.o
COBJS-$(CONFIG_CMD_MMC) += cmd_mmc.o
@ -151,8 +153,7 @@ COBJS-$(CONFIG_LYNXKDI) += lynxkdi.o
COBJS-$(CONFIG_USB_KEYBOARD) += usb_kbd.o
COBJS-$(CONFIG_DDR_SPD) += ddr_spd.o
COBJS-y += $(COBJS-yy)
COBJS := $(COBJS-y)
COBJS := $(sort COBJS-y)
SRCS := $(AOBJS:.o=.S) $(COBJS:.o=.c)
OBJS := $(addprefix $(obj),$(AOBJS) $(COBJS))

6
drivers/rtc/Makefile
View file

@ -32,8 +32,8 @@ COBJS-y += date.o
COBJS-$(CONFIG_RTC_DS12887) += ds12887.o
COBJS-$(CONFIG_RTC_DS1302) += ds1302.o
COBJS-$(CONFIG_RTC_DS1306) += ds1306.o
COBJS-$(CONFIG_RTC_DS1307)$(CONFIG_RTC_DS1338) += ds1307.o
COBJS-y += $(COBJS-yy)
COBJS-$(CONFIG_RTC_DS1307) += ds1307.o
COBJS-$(CONFIG_RTC_DS1338) += ds1307.o
COBJS-$(CONFIG_RTC_DS1337) += ds1337.o
COBJS-$(CONFIG_RTC_DS1374) += ds1374.o
COBJS-$(CONFIG_RTC_DS1556) += ds1556.o
@ -59,7 +59,7 @@ COBJS-$(CONFIG_RTC_RX8025) += rx8025.o
COBJS-$(CONFIG_RTC_S3C24X0) += s3c24x0_rtc.o
COBJS-$(CONFIG_RTC_X1205) += x1205.o
COBJS := $(COBJS-y)
COBJS := $(sort COBJS-y)
SRCS := $(COBJS:.o=.c)
OBJS := $(addprefix $(obj),$(COBJS))

2
drivers/serial/Makefile
View file

@ -39,7 +39,7 @@ COBJS-$(CONFIG_XILINX_UARTLITE) += serial_xuartlite.o
COBJS-$(CONFIG_SCIF_CONSOLE) += serial_sh.o
COBJS-$(CONFIG_USB_TTY) += usbtty.o
COBJS := $(COBJS-y)
COBJS := $(sort COBJS-y)
SRCS := $(COBJS:.o=.c)
OBJS := $(addprefix $(obj),$(COBJS))