Hi Steven, I recommend you to read the GNU make manual. See http://www.gnu.org/software/make/manual/
On Tue, Feb 17, 2009 at 2:43 PM, Steven Zedeck <[email protected]> wrote: > > Hi all, > I am new to u-boot. But I am ramping up pretty fast. My primary issue is > understanding the Makefile syntax. Is there a good tutorial somewhere that > explains how u-boot uses the Makefiles and their syntax? > > For example, I'm having problems understanding what this means in a > Makefile: > > COBJS-$(CONFIG_HAS_DATAFLASH) += at45.o > COBJS-$(CONFIG_FLASH_CFI_DRIVER) += cfi_flash.o > COBJS-$(CONFIG_HAS_DATAFLASH) += dataflash.o > COBJS-$(CONFIG_FLASH_CFI_LEGACY) += jedec_flash.o > COBJS-$(CONFIG_MW_EEPROM) += mw_eeprom.o > > COBJS := $(COBJS-y) > SRCS := $(COBJS:.o=.c) > OBJS := $(addprefix $(obj),$(COBJS)) > > This is from drivers/mtd/Makefile. > > How does COBJS get initially defined upon entry into the Makefile? > > Does at45.o get added to the list of objects to be built only if the > CONFIG_HAS_DATAFLASH flag is set? > > What does the "-" sign mean before the "$" ? > > What does this mean? COBJS := $(COBJS-y) > > I'm sorry for the "dumb" questions. Any help with the understanding of > Makefiles would be greatly appreciated. > > Thanks in advance, > Steve > -- > View this message in context: > http://www.nabble.com/U-Boot-Makefile-question-tp22057574p22057574.html > Sent from the Uboot - Users mailing list archive at Nabble.com. > > _______________________________________________ > U-Boot mailing list > [email protected] > http://lists.denx.de/mailman/listinfo/u-boot > _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
