URL:
<http://savannah.gnu.org/bugs/?17448>
Summary: Function argument parsing inconsistent in treatment
of whitespace
Project: make
Submitted by: bobbogo
Submitted on: Wednesday 08/16/2006 at 16:49
Severity: 3 - Normal
Item Group: Bug
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Component Version: 3.80
Operating System: Any
Fixed Release: None
_______________________________________________________
Details:
What does this makefile produce?
$ cat Makefile
e :=
s := $e hello there $e
$(warning if: [$(if $e , some , <none> )])
$(warning and: [$(and a$e , $s )])
$(warning or: [$(or $e ,$s)])
$(warning patsubst:[$(patsubst aa,a,$s)])
$(warning patsubst:[$(patsubst aa%,a, $s )])
$(warning patsubst:[$(patsubst aa%%,a, $s )])
$(warning patsubst:[$(patsubst hello,,$s)])
$(warning patsubst:[$(patsubst hello ,,$s)])
args = $(warning args: [$1][$2][$3])
$(call args ,$s, $s, $s )
$(error bye)
$ make380 2>&1 | tr ' ' ,
Makefile:3:,if:,[,some,]
Makefile:4:,and:,[]
Makefile:5:,or:,[]
Makefile:6:,patsubst:[,hello,,,there,]
Makefile:7:,patsubst:[hello,there]
Makefile:8:,patsubst:[hello,there]
Makefile:9:,patsubst:[,,,,there,]
Makefile:10:,patsubst:[,,,there,]
Makefile:12:,args:,[,hello,,,there,][,,hello,,,there,][,,hello,,,there,,]
Makefile:13:,***,bye.,,Stop.
$ make381 2>&1 | tr ' ' ,
Makefile:3:,if:,[,<none>,]
Makefile:4:,and:,[,hello,,,there,]
Makefile:5:,or:,[,hello,,,there,]
Makefile:6:,patsubst:[,hello,,,there,]
Makefile:7:,patsubst:[hello,there]
Makefile:8:,patsubst:[hello,there]
Makefile:9:,patsubst:[,,,,there,]
Makefile:10:,patsubst:[,,,there,]
Makefile:12:,args:,[,hello,,,there,][,,hello,,,there,][,,hello,,,there,,]
Makefile:13:,***,bye.,,Stop.
Dunno how to rationalise this. Some functions strip w.s. from around all the
arguments (and, or); some from just the first argument (call); and patsubst
will $(strip) its last argument only when its first contains a % (even if
it's doubled as in %%).
Oh, and there's a regression in the 1st argument of $(if) from 3.80 to 3.81.
This is a documentation error if nothing else. The manual says "The arguments
are the arguments of the function. They are separated from the function name
by one or more spaces or tabs, and if there is more than one argument, then
they are separated by commas. Such whitespace and commas are not part of an
argument's value." Does the "such whitespace" in this snippet mean just the
w.s. between the function name and the first argument? It seems that only
$(patsubst) does it right in this regard.
_______________________________________________________
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<http://savannah.gnu.org/bugs/?17448>
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