[CMake] the list parameter passed to function

[Marmot Ken]

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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