[CMake] ARGC != list(LENGTH ARGV) and ARGV0 != list(GET ARGV 0)

[Clark WANG]

On Fri, Oct 11, 2013 at 2:20 PM, Rolf Eike Beer <eike at sf-mail.de> wrote:

> Am Freitag, 11. Oktober 2013, 12:07:58 schrieb Clark WANG:
> > See following example:
> >
> >     $ cmake --version
> >     cmake version 2.8.11.2
> >     $ cat CMakeLists.txt
> >     cmake_minimum_required(VERSION 2.8)
> >
> >     FUNCTION(foo)
> >         list(LENGTH ARGV argc)
> >         message("ARGC=${ARGC} list(LENGTH ARGV)=${argc}")
> >
> >         list(GET ARGV 0 argv0)
> >         message("ARGV0=${ARGV0} list(GET ARGV 0)=${argv0}")
> >     ENDFUNCTION()
> >
> >     foo("a;b;c")
> >     $ cmake .
> >     ARGC=1 list(LENGTH ARGV)=3
> >     ARGV0=a;b;c list(GET ARGV 0)=a
> >     -- Configuring done
> >     -- Generating done
> >     -- Build files have been written to: /root/tmp
> >     $
> >
> > I know ';' is special in cmake but it's counter-intuitive that ARGC !=
> > list(LENGTH ARGV). Is this a bug?
>
> CMake will not expand a string into a list when passed as arguments.


Yes I know this. But after the literal string is passed to the function, it
is broken into a list (ARGV). And the ARGC value is not consistent with the
length of of ARGV which I've never seen in other languages. And this
behavior makes it difficult to pass parameters around between cmake
functions.


> It would
> do when using a variable:
>
>     set(foovar "a;b;c")
>     foo(${foovar})
>
> ARGC=3 list(LENGTH ARGV)=3
> ARGV0=a list(GET ARGV 0)=a
>
> Eike
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