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>> I'm reading top-level makefile of kernel version of 2.6.25, and being confused about >> "$(Q)@" in following lines: >> >> 124 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make >> 125 $(Q)@: >> >> I know what's meaning for line 124, but what about line 125? Is it a command? > > Are u notice the comment in the Makefile ? > u need more carefully to read the Makefile ^_^....... En, it's true, "more carefully" is always what I need.... thanks for your remind, see bellow please. > > # Beautify output > # --------------------------------------------------------------------------- > # > # Normally, we echo the whole command before executing it. By making > # that echo $($(quiet)$(cmd)), we now have the possibility to set > # $(quiet) to choose other forms of output instead, e.g. > # > # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ > # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< > # > # If $(quiet) is empty, the whole command will be printed. > # If it is set to "quiet_", only the short version will be printed. > # If it is set to "silent_", nothing will be printed at all, since > # the variable $(silent_cmd_cc_o_c) doesn't exist. > # > # A simple variant is to prefix commands with $(Q) - that's useful > # for commands that shall be hidden in non-verbose mode. > # > # $(Q)ln $@ :< > # > # If KBUILD_VERBOSE equals 0 then the above command will be hidden. > # If KBUILD_VERBOSE equals 1 then the above command is displayed. > > ifeq ($(KBUILD_VERBOSE),1) > quiet = > Q = > else > quiet=quiet_ > Q = @ > endif > > >> I know the "$(Q)@" indicates nothing if KBUILD_VERBOSE==1,and @ if KBUILD_VERBOSE gave other >> values. Oh, here are some words typed incorrectly. The "$(Q)" will expand to "@" when KBUILD_VERBOSE doesn't equal to 1, is this right? If it's true, than what's meaning "@@:" at line 125 ????? How about "@:" again if KBUID_VERBOS==1 ???? >> >> Thanks.. >> > |
