Kbuild idiom using colon (:) and percent (%) in variable expansion

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What does the KBuild expression:

FOO := $(BAR:"%"=%)

do as part of a Linux kernel Makefile?

Never mind: I found the answer elsewhere.

edited Jul 12 at 14:02

Kusalananda

101k13199312

asked Jul 12 at 13:50

JohnRWicks

I already answered your question here as well: Make idiom using colon (:) and percent (%) in variable expansion
â€“Â steeldriver
Jul 12 at 14:12

1

But the method you discovered is non-portable as it only works with gmake. The method from your question however works in all recent make implementations.
â€“Â schily
Jul 12 at 14:14

add a commentÂ |Â

up vote
0
down vote

favorite

What does the KBuild expression:

FOO := $(BAR:"%"=%)

do as part of a Linux kernel Makefile?

Never mind: I found the answer elsewhere.

edited Jul 12 at 14:02

Kusalananda

101k13199312

asked Jul 12 at 13:50

JohnRWicks

I already answered your question here as well: Make idiom using colon (:) and percent (%) in variable expansion
â€“Â steeldriver
Jul 12 at 14:12

1

But the method you discovered is non-portable as it only works with gmake. The method from your question however works in all recent make implementations.
â€“Â schily
Jul 12 at 14:14

add a commentÂ |Â

up vote
0
down vote

favorite

What does the KBuild expression:

FOO := $(BAR:"%"=%)

do as part of a Linux kernel Makefile?

Never mind: I found the answer elsewhere.

edited Jul 12 at 14:02

Kusalananda

101k13199312

asked Jul 12 at 13:50

JohnRWicks

What does the KBuild expression:

FOO := $(BAR:"%"=%)

do as part of a Linux kernel Makefile?

Never mind: I found the answer elsewhere.

edited Jul 12 at 14:02

Kusalananda

101k13199312

asked Jul 12 at 13:50

JohnRWicks

edited Jul 12 at 14:02

Kusalananda

101k13199312

edited Jul 12 at 14:02

Kusalananda

101k13199312

edited Jul 12 at 14:02

Kusalananda

101k13199312

asked Jul 12 at 13:50

JohnRWicks

asked Jul 12 at 13:50

JohnRWicks

asked Jul 12 at 13:50

JohnRWicks

I already answered your question here as well: Make idiom using colon (:) and percent (%) in variable expansion
â€“Â steeldriver
Jul 12 at 14:12

1

But the method you discovered is non-portable as it only works with gmake. The method from your question however works in all recent make implementations.
â€“Â schily
Jul 12 at 14:14

add a commentÂ |Â

I already answered your question here as well: Make idiom using colon (:) and percent (%) in variable expansion
â€“Â steeldriver
Jul 12 at 14:12

1

But the method you discovered is non-portable as it only works with gmake. The method from your question however works in all recent make implementations.
â€“Â schily
Jul 12 at 14:14

I already answered your question here as well: Make idiom using colon (:) and percent (%) in variable expansion
â€“Â steeldriver
Jul 12 at 14:12

But the method you discovered is non-portable as it only works with gmake. The method from your question however works in all recent make implementations.
â€“Â schily
Jul 12 at 14:14

add a commentÂ |Â

2 Answers
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0
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It assigns the value of the Makefile variable BAR to FOO, but removes all double quotes around words.

Example:

BAR:= "hello" "world"
FOO:= $(BAR:"%"=%)

all:
 @echo 'BAR = $(BAR)'
 @echo 'FOO = $(FOO)'

Testing:

$ make
BAR = "hello" "world"
FOO = hello world

answered Jul 12 at 14:01

Kusalananda

101k13199312

add a commentÂ |Â

up vote
-1
down vote

This is a so called pattern macro replacement.

The feature was first introduced in 1986 in SunPro Make and is also part of gmake.

The construct

$(VAR:op%os=np%ns)

uses % as a match all case and allows to replace the old prefix and suffix by a new prefix and suffix.

In your case, it removes " around words, since old prefix and old suffix are both " and new prefix and new suffix are both empty.

answered Jul 12 at 13:59

schily

8,46521435

add a commentÂ |Â

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2 Answers
2

active

oldest

votes

2 Answers
2

active

oldest

votes

up vote
0
down vote

It assigns the value of the Makefile variable BAR to FOO, but removes all double quotes around words.

Example:

BAR:= "hello" "world"
FOO:= $(BAR:"%"=%)

all:
 @echo 'BAR = $(BAR)'
 @echo 'FOO = $(FOO)'

Testing:

$ make
BAR = "hello" "world"
FOO = hello world

answered Jul 12 at 14:01

Kusalananda

101k13199312

add a commentÂ |Â

up vote
0
down vote

It assigns the value of the Makefile variable BAR to FOO, but removes all double quotes around words.

Example:

BAR:= "hello" "world"
FOO:= $(BAR:"%"=%)

all:
 @echo 'BAR = $(BAR)'
 @echo 'FOO = $(FOO)'

Testing:

$ make
BAR = "hello" "world"
FOO = hello world

answered Jul 12 at 14:01

Kusalananda

101k13199312

add a commentÂ |Â

up vote
0
down vote

It assigns the value of the Makefile variable BAR to FOO, but removes all double quotes around words.

Example:

BAR:= "hello" "world"
FOO:= $(BAR:"%"=%)

all:
 @echo 'BAR = $(BAR)'
 @echo 'FOO = $(FOO)'

Testing:

$ make
BAR = "hello" "world"
FOO = hello world

answered Jul 12 at 14:01

Kusalananda

101k13199312

It assigns the value of the Makefile variable BAR to FOO, but removes all double quotes around words.

Example:

BAR:= "hello" "world"
FOO:= $(BAR:"%"=%)

all:
 @echo 'BAR = $(BAR)'
 @echo 'FOO = $(FOO)'

Testing:

$ make
BAR = "hello" "world"
FOO = hello world

answered Jul 12 at 14:01

Kusalananda

101k13199312

answered Jul 12 at 14:01

Kusalananda

101k13199312

answered Jul 12 at 14:01

Kusalananda

101k13199312

answered Jul 12 at 14:01

Kusalananda

101k13199312

add a commentÂ |Â

up vote
-1
down vote

This is a so called pattern macro replacement.

The feature was first introduced in 1986 in SunPro Make and is also part of gmake.

The construct

$(VAR:op%os=np%ns)

uses % as a match all case and allows to replace the old prefix and suffix by a new prefix and suffix.

In your case, it removes " around words, since old prefix and old suffix are both " and new prefix and new suffix are both empty.

answered Jul 12 at 13:59

schily

8,46521435

add a commentÂ |Â

up vote
-1
down vote

This is a so called pattern macro replacement.

The feature was first introduced in 1986 in SunPro Make and is also part of gmake.

The construct

$(VAR:op%os=np%ns)

uses % as a match all case and allows to replace the old prefix and suffix by a new prefix and suffix.

In your case, it removes " around words, since old prefix and old suffix are both " and new prefix and new suffix are both empty.

answered Jul 12 at 13:59

schily

8,46521435

add a commentÂ |Â

up vote
-1
down vote

This is a so called pattern macro replacement.

The feature was first introduced in 1986 in SunPro Make and is also part of gmake.

The construct

$(VAR:op%os=np%ns)

uses % as a match all case and allows to replace the old prefix and suffix by a new prefix and suffix.

In your case, it removes " around words, since old prefix and old suffix are both " and new prefix and new suffix are both empty.

answered Jul 12 at 13:59

schily

8,46521435

This is a so called pattern macro replacement.

The feature was first introduced in 1986 in SunPro Make and is also part of gmake.

The construct

$(VAR:op%os=np%ns)

uses % as a match all case and allows to replace the old prefix and suffix by a new prefix and suffix.

In your case, it removes " around words, since old prefix and old suffix are both " and new prefix and new suffix are both empty.

answered Jul 12 at 13:59

schily

8,46521435

answered Jul 12 at 13:59

schily

8,46521435

answered Jul 12 at 13:59

schily

8,46521435

answered Jul 12 at 13:59

schily

8,46521435

add a commentÂ |Â

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