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What is the meaning of $(Q)@: in Makefile
What does @: (at symbol colon) mean in a Makefile?What is the difference between the GNU Makefile variable assignments =, ?=, := and +=?How do I write the 'cd' command in a makefile?What is the purpose of .PHONY in a makefile?What do the makefile symbols $@ and $< mean?Sources from subdirectories in MakefileWhat does @: (at symbol colon) mean in a Makefile?What are the major differences between makefile and CMakeListHow to print out a variable in makefileAssignment of variable in GNU MakefileIncluding sub makefiles in a master makefile: variables changed in sub makefile do not reflect in master makefile
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty height:90px;width:728px;box-sizing:border-box;
I've read in linux Makefile:
$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
$(Q)@:
What is the meaning of "$(Q)@:"?
I'm trying to google it, but google always crappy if the search using some weird character. So in the end i can't found any Manual about it.
makefile gnu-make
asked Apr 9 '16 at 18:55
nafsakanafsaka
509717
add a comment |
I've read in linux Makefile:
$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
$(Q)@:
What is the meaning of "$(Q)@:"?
I'm trying to google it, but google always crappy if the search using some weird character. So in the end i can't found any Manual about it.
makefile gnu-make
asked Apr 9 '16 at 18:55
nafsakanafsaka
509717
add a comment |
I've read in linux Makefile:
$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
$(Q)@:
What is the meaning of "$(Q)@:"?
I'm trying to google it, but google always crappy if the search using some weird character. So in the end i can't found any Manual about it.
makefile gnu-make
asked Apr 9 '16 at 18:55
nafsakanafsaka
509717
I've read in linux Makefile:
$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
$(Q)@:
What is the meaning of "$(Q)@:"?
I'm trying to google it, but google always crappy if the search using some weird character. So in the end i can't found any Manual about it.
makefile gnu-make
makefile gnu-make
asked Apr 9 '16 at 18:55
nafsakanafsaka
509717
asked Apr 9 '16 at 18:55
nafsakanafsaka
509717
asked Apr 9 '16 at 18:55
nafsakanafsaka
509717
asked Apr 9 '16 at 18:55
nafsakanafsaka
509717
asked Apr 9 '16 at 18:55
nafsakanafsaka
509717
509717
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
After looking in the code. Q is defined somewhere after those line. Since makefile have peculiar concept of variable (which is expandable), it can be implement in anywhere. Q is used to whether show message or not (Q maybe for Quiet).
ifeq ($(KBUILD_VERBOSE),1)
quiet =
Q =
else
quiet=quiet_
Q = @
endif
And for the last @: this means do-nothing-output-nothing.
So the conclusion $(Q)@: simply do-nothing-output-nothing.
edited May 23 '17 at 10:29
Community♦
11
answered Apr 9 '16 at 20:03
nafsakanafsaka
509717
add a comment |
To reinforce and expand on what nafsaka found:
Sometimes Makefiles are written like this:
target:
rm -rf $(DIRECTORY)
$(Q)$(MAKE) all
And Q will be defined as @ or nothing for example:
V ?= 0
ifeq ($(V), 0)
Q = @
else
Q =
endif
If a target action is preceded by @ then make won't display it when run. Here's the GNU make documentation on that subject: Recipe Echoing
In this case you need to define V=1 before running make to see commands as they're run (This is very common).
Another wrinkle: Look for "include file.mk" statements in your Makefile, which is where V and Q were defined in my case. Here's the GNU make documentation on include: Including Other Makefiles
answered Mar 22 at 23:20
Brad DreBrad Dre
1,3721016
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
After looking in the code. Q is defined somewhere after those line. Since makefile have peculiar concept of variable (which is expandable), it can be implement in anywhere. Q is used to whether show message or not (Q maybe for Quiet).
ifeq ($(KBUILD_VERBOSE),1)
quiet =
Q =
else
quiet=quiet_
Q = @
endif
And for the last @: this means do-nothing-output-nothing.
So the conclusion $(Q)@: simply do-nothing-output-nothing.
edited May 23 '17 at 10:29
Community♦
11
answered Apr 9 '16 at 20:03
nafsakanafsaka
509717
add a comment |
After looking in the code. Q is defined somewhere after those line. Since makefile have peculiar concept of variable (which is expandable), it can be implement in anywhere. Q is used to whether show message or not (Q maybe for Quiet).
ifeq ($(KBUILD_VERBOSE),1)
quiet =
Q =
else
quiet=quiet_
Q = @
endif
And for the last @: this means do-nothing-output-nothing.
So the conclusion $(Q)@: simply do-nothing-output-nothing.
edited May 23 '17 at 10:29
Community♦
11
answered Apr 9 '16 at 20:03
nafsakanafsaka
509717
add a comment |
After looking in the code. Q is defined somewhere after those line. Since makefile have peculiar concept of variable (which is expandable), it can be implement in anywhere. Q is used to whether show message or not (Q maybe for Quiet).
ifeq ($(KBUILD_VERBOSE),1)
quiet =
Q =
else
quiet=quiet_
Q = @
endif
And for the last @: this means do-nothing-output-nothing.
So the conclusion $(Q)@: simply do-nothing-output-nothing.
edited May 23 '17 at 10:29
Community♦
11
answered Apr 9 '16 at 20:03
nafsakanafsaka
509717
After looking in the code. Q is defined somewhere after those line. Since makefile have peculiar concept of variable (which is expandable), it can be implement in anywhere. Q is used to whether show message or not (Q maybe for Quiet).
ifeq ($(KBUILD_VERBOSE),1)
quiet =
Q =
else
quiet=quiet_
Q = @
endif
And for the last @: this means do-nothing-output-nothing.
So the conclusion $(Q)@: simply do-nothing-output-nothing.
edited May 23 '17 at 10:29
Community♦
11
answered Apr 9 '16 at 20:03
nafsakanafsaka
509717
edited May 23 '17 at 10:29
Community♦
11
edited May 23 '17 at 10:29
Community♦
11
edited May 23 '17 at 10:29
Community♦
11
11
answered Apr 9 '16 at 20:03
nafsakanafsaka
509717
answered Apr 9 '16 at 20:03
nafsakanafsaka
509717
answered Apr 9 '16 at 20:03
nafsakanafsaka
509717
509717
add a comment |
add a comment |
To reinforce and expand on what nafsaka found:
Sometimes Makefiles are written like this:
target:
rm -rf $(DIRECTORY)
$(Q)$(MAKE) all
And Q will be defined as @ or nothing for example:
V ?= 0
ifeq ($(V), 0)
Q = @
else
Q =
endif
If a target action is preceded by @ then make won't display it when run. Here's the GNU make documentation on that subject: Recipe Echoing
In this case you need to define V=1 before running make to see commands as they're run (This is very common).
Another wrinkle: Look for "include file.mk" statements in your Makefile, which is where V and Q were defined in my case. Here's the GNU make documentation on include: Including Other Makefiles
answered Mar 22 at 23:20
Brad DreBrad Dre
1,3721016
add a comment |
To reinforce and expand on what nafsaka found:
Sometimes Makefiles are written like this:
target:
rm -rf $(DIRECTORY)
$(Q)$(MAKE) all
And Q will be defined as @ or nothing for example:
V ?= 0
ifeq ($(V), 0)
Q = @
else
Q =
endif
If a target action is preceded by @ then make won't display it when run. Here's the GNU make documentation on that subject: Recipe Echoing
In this case you need to define V=1 before running make to see commands as they're run (This is very common).
Another wrinkle: Look for "include file.mk" statements in your Makefile, which is where V and Q were defined in my case. Here's the GNU make documentation on include: Including Other Makefiles
answered Mar 22 at 23:20
Brad DreBrad Dre
1,3721016
add a comment |
To reinforce and expand on what nafsaka found:
Sometimes Makefiles are written like this:
target:
rm -rf $(DIRECTORY)
$(Q)$(MAKE) all
And Q will be defined as @ or nothing for example:
V ?= 0
ifeq ($(V), 0)
Q = @
else
Q =
endif
If a target action is preceded by @ then make won't display it when run. Here's the GNU make documentation on that subject: Recipe Echoing
In this case you need to define V=1 before running make to see commands as they're run (This is very common).
Another wrinkle: Look for "include file.mk" statements in your Makefile, which is where V and Q were defined in my case. Here's the GNU make documentation on include: Including Other Makefiles
answered Mar 22 at 23:20
Brad DreBrad Dre
1,3721016
To reinforce and expand on what nafsaka found:
Sometimes Makefiles are written like this:
target:
rm -rf $(DIRECTORY)
$(Q)$(MAKE) all
And Q will be defined as @ or nothing for example:
V ?= 0
ifeq ($(V), 0)
Q = @
else
Q =
endif
If a target action is preceded by @ then make won't display it when run. Here's the GNU make documentation on that subject: Recipe Echoing
In this case you need to define V=1 before running make to see commands as they're run (This is very common).
Another wrinkle: Look for "include file.mk" statements in your Makefile, which is where V and Q were defined in my case. Here's the GNU make documentation on include: Including Other Makefiles
answered Mar 22 at 23:20
Brad DreBrad Dre
1,3721016
answered Mar 22 at 23:20
Brad DreBrad Dre
1,3721016
answered Mar 22 at 23:20
Brad DreBrad Dre
1,3721016
answered Mar 22 at 23:20
Brad DreBrad Dre
1,3721016
1,3721016
add a comment |
add a comment |
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