[CMake] CMake is Converting lists to strings

[Marc CHEVRIER]

You are wrongly using the STRING(REPLACE …) command.

The right way to use it to avoid list conversion is to expand the list inside quotes (to preserve list items separators):

STRING (REPLACE "../" "" SIMPLE_LIST "${SIMPLE_LIST}")

Without the quotes, all list elements are concatenated in the result string (see documentation).

Another possibility is using LIST(TRANSFORM …):

LIST(TRANSFORM SIMPLE_LIST REPLACE « ^\\.\\./"  "")
Le 12 juin 2019 à 12:22 +0200, J Decker <d3ck0r at gmail.com>, a écrit :
> I know... just need to rebuild a new list... something like....
>
>  set( _ALL_INCLUDES )
> foreach( INC ${ALL_INCLUDES})
>     string(REPLACE "../" "" INC ${INC})
>     LIST( APPEND _ALL_INCLUDES ${INC} )
> endforeach( INC )
> set( ALL_INCLUDES ${_ALL_INCLUDES})
>
> > On Wed, Jun 12, 2019 at 3:10 AM J Decker <d3ck0r at gmail.com> wrote:
> > > I'm collecting sources and includes into a parent scope variable, and then attempting to use that variable to reference the right sources.
> > > Sources get added to the list as ../(theirpath)/(source) so in the parent level I can simply replace "../" with "" and then they are relative in the right place.
> > > This works; as far as, the includes, sources and defines get all collected into the top level, but when i try to remove the ../ the list gets converted into a string.
> > >
> > > # Create a list of things
> > > set( SIMPLE_LIST -I../lib1/include -I../lib2/include -I../lib3/include )
> > > # set a variable using that list...
> > >   set( AMALG_COMMAND echo ${SIMPLE_LIST}  )
> > > # this outputs COMMAND:echo;-I../lib1/include;-I../lib2/include;-I../lib3/include
> > >   message( "COMMAND:${AMALG_COMMAND}")
> > >
> > > # replace ../ with nothing
> > > STRING( REPLACE "../" "" SIMPLE_LIST ${SIMPLE_LIST} )
> > > # re-set a variable with the eventual command to run
> > >   set( AMALG_COMMAND echo ${SIMPLE_LIST}  )
> > > # this outputs COMMAND:echo;-Ilib1/include -Ilib2/include -Ilib3/include
> > >   message( "COMMAND:${AMALG_COMMAND}")
> > >
> > > When that final command actually gets run in a
> > >   add_custom_command( OUTPUT ${CMAKE_CURRENT_SOURCE_DIR}/out.c   COMMAND ${AMALG_COMMAND}  )
> > >
> > > Then the command is 'echo "-Ilib1/include -Ilib2/include -Ilib3/include"' which is incorrect.
> > >
> > >
> > > I tried first LIST(JOIN) but that defiantly makes a string and doesn't help.
> > > string(REPLACE " " ";" SIMPLE_LIST ${SIMPLE_LIST})  to try and reverse it back to a list doesn't seem to help...
> --
>
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