Re: [CMake] list( LENGTH ) problem

[Eric NOULARD]

Le Wed, 3 Dec 2008 10:09:56 -0600,
"Robert Dailey" <[EMAIL PROTECTED]> a écrit :

> On Tue, Dec 2, 2008 at 3:00 PM, Alexander Neundorf
> <[EMAIL PROTECTED]>wrote:
> 
> > It expects a variable which holds a list:
> >
> > set(myList foo bar)
> > list( LENGTH myList listlen )
> > message( ${listlen} )
> >
> > (didn't test or check docs, but I think that should be it)
> 
> 
> Why did you do:
> 
> list( LENGTH myList listlen )
> 
> instead of:
> 
> list( LENGTH ${myList} listlen ) 
> 
> This seems pretty inconsistent with how I pass variables into
> functions in other places, like message() for example.

Nope it is consistent.
"list" command is working on the "object" list whereas
message is generally interested in the "value" of your "object".

There is the same idea/issue/feature with "if" command which can
work either on content (i.e. value) or on the variable itself (object).

if(variable STRLESS string)
if(string STRLESS string)

I do attach a file for playing with value and object try
to execute it with cmake -P  playing_with_value_and_object.cmake.

You may eventually find it interesting.


-- 
Erk

# classic VAR
SET(VALUE "Value")
SET(NAME  "Name")
# use value for VAR name
SET(Toto.${VALUE} "another value")
SET(Toto.${NAME}  "nice name")

# use those in message
MESSAGE(VALUE=${VALUE})
MESSAGE(NAME=${NAME})
MESSAGE(Toto.${VALUE}=${Toto.${VALUE}})
MESSAGE(Toto.${NAME}=${Toto.${NAME}})

# Now with list
SET(MyList1 a b c)
SET(MyList2 a d)

IF(UNIX) 
  SET(C MyList1)
ELSE(UNIX)
  SET(C MyList2)
ENDIF(UNIX)

LIST(LENGTH ${C} len)
MESSAGE(len = ${len})
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Re: [CMake] list( LENGTH ) problem

[Robert Dailey]

On Tue, Dec 2, 2008 at 3:00 PM, Alexander Neundorf
<[EMAIL PROTECTED]>wrote:

> It expects a variable which holds a list:
>
> set(myList foo bar)
> list( LENGTH myList listlen )
> message( ${listlen} )
>
> (didn't test or check docs, but I think that should be it)


Why did you do:

list( LENGTH myList listlen )

instead of:

list( LENGTH ${myList} listlen )


This seems pretty inconsistent with how I pass variables into functions in
other places, like message() for example.
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Re: [CMake] list( LENGTH ) problem

[Alexander Neundorf]

On Tuesday 02 December 2008, Robert Dailey wrote:
> Hi,
>
> I execute the following CMake code:
>
> list( LENGTH "foo;bar" listlen )
> message( ${listlen} )
>
> However, this results in the value "0" to be printed. I expect this to
> print "2". What am I doing wrong?

It expects a variable which holds a list:

set(myList foo bar)
list( LENGTH myList listlen )
message( ${listlen} )

(didn't test or check docs, but I think that should be it)

Alex
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Re: [CMake] list( LENGTH ) problem

[Maik Beckmann]

Am Dienstag, 2. Dezember 2008 schrieb Robert Dailey:
> Hi,
>
> I execute the following CMake code:
>
> list( LENGTH "foo;bar" listlen )
> message( ${listlen} )
>
> However, this results in the value "0" to be printed. I expect this to
> print "2". What am I doing wrong?

list takes a list-name, so 
  list( LENGTH "foo;bar" listlen )
looks for a list named "foo;bar", doesn't find it and sets listlen to 0.
Try 
  set(mylist "foo;bar")
  list(LENGTH mylist listlen)
  message(${listlen})
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[CMake] list( LENGTH ) problem

[Robert Dailey]

Hi,

I execute the following CMake code:

list( LENGTH "foo;bar" listlen )
message( ${listlen} )

However, this results in the value "0" to be printed. I expect this to print
"2". What am I doing wrong?
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