[CMake] the list parameter passed to function

[Petr Kmoch]

On Sun, May 27, 2012 at 3:23 PM, Marmot Ken <realwangbo at gmail.com> wrote:
> Sorry.  Copy-paste error kicks my ass.
>
>
>  Output expected :
>
>   SRC_LIST : ./a.cpp;./c.cpp;./main.cpp
>   src_list_in : ./a.cpp;./c.cpp;./main.cpp
>
> Now i got the solution.
>
> invoke the function like this :
>
>   AUX_SOURCE_DIRECTORY( . SRC_LIST  )
>   MESSAGE( SRC_LIST  " : ${SRC_LIST} " )
>
>   Append_headers_to_src_list( SRC_LIST  "${SRC_LIST}"
> ${CMAKE_SOURCE_DIR}/include/test  )
>
> Question is :
>    Why?

Because cmake is a text-based scripting language and for backward
compatibility reasons, list elements (including in argument lists) can
be separated either by space or semi-colon. Therefore, the call

Append_headers_to_src_list(SRC_LIST ${SRC_LIST}
${CMAKE_SOURCE_DIR}/include/test)

expands to:

Append_headers_to_src_list(SRC_LIST ./a.cpp;./c.cpp;./main.cpp
the_source_dir/include/test)

(where the_source_dir is your value of CMAKE_SOURCE_DIR), which is
equivalent to:

Append_headers_to_src_list(SRC_LIST ./a.cpp ./c.cpp ./main.cpp
the_source_dir/include/test)

So the function paramteres are assigned as follows:

src_list_out: SRC_LIST
src_list_in: ./a.cpp
header_file_path_in: ./c.cpp
ARGN: ./main.cpp;the_source_dir/include/test

(ARGN is the list of "arguments past last named parameter").

You have two solutions: one is the one you already use (pass the
in-list quoted), the other would be to require the in-list to always
be stored in a variable and pass only the name of the variable.

Hope this helps,

Petr

>
>
> 2012/5/22 Petr Kmoch <petr.kmoch at gmail.com>
>>
>> Hi,
>>
>> try as I might, I can't see a difference between the output and
>> expected output. Perhaps a copy-paste error?
>>
>> Petr
>>
>> On Tue, May 22, 2012 at 3:07 AM, Marmot Ken <realwangbo at gmail.com> wrote:
>> > here is the function :
>> >
>> > FUNCTION( Append_headers_to_src_list  src_list_out src_list_in
>> > header_file_path_in )
>> >     MESSAGE( src_list_in  " : ${src_list_in}" )
>> >     FILE( GLOB_RECURSE TEMP_LIST ${header_file_path_in}/*.h )
>> >     SET( ${src_list_out} ${src_list_in} ${TEMP_LIST} PARENT_SCOPE )
>> > ENDFUNCTION( Append_headers_to_src_list
>> >
>> >
>> > here is the place where the function is invoked:
>> >
>> > AUX_SOURCE_DIRECTORY( . SRC_LIST  )
>> > MESSAGE( SRC_LIST  " : ${SRC_LIST} " )
>> >
>> > Append_headers_to_src_list( SRC_LIST  ${SRC_LIST}
>> > ${CMAKE_SOURCE_DIR}/include/test  )
>> >
>> > here is output　：
>> >
>> > SRC_LIST : ./a.cpp;./c.cpp;./main.cpp
>> > src_list_in : ./a.cpp
>> >
>> > Output expected :
>> >
>> > SRC_LIST : ./a.cpp;./c.cpp;./main.cpp
>> > src_list_in : ./a.cpp
>> >
>> > Ｑｕｅｓｔｉｏｎ：
>> >　      <1>  how to get expected Output ?
>> >         <2>  why ?
>> >
>> > Thanks.
>> >
>> > --
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>