[CMake] Separating spaces are escaped by JOIN generator expression

[Marc CHEVRIER]

This is the way to proceed...
Le 6 août 2019 à 17:23 +0200, Unknown Unknown <mrdakeryas at gmail.com>, a écrit :
> I am getting a further by combining your idea with a "add_custom_command" and using the "COMMAND_EXPAND_LISTS" trick I have just discovered. Essentially I have something like the following to get the desired results:
>
> list(APPEND DICTIONARY_INCLUDES "-I$<JOIN:$<TARGET_PROPERTY:MyLibrary,INTERFACE_INCLUDE_DIRECTORIES>,$<SEMICOLON>-I>")
>
> add_custom_command(
>     OUTPUT ${DICTIONARY_SOURCE}
>     COMMAND rootcling -f ${DICTIONARY_SOURCE}
>                       -rml lib${PROJECT_NAME}.so
>                       -rmf lib${PROJECT_NAME}.rootmap
>                       -s lib${PROJECT_NAME}.so
>                       -inlineInputHeader
>                       "${DICTIONARY_INCLUDES}"
>                       -I${CMAKE_CURRENT_SOURCE_DIR} ${DICTIONARY_HEADERS}
>                       ${CMAKE_CURRENT_SOURCE_DIR}/${DICTIONARY_LINKDEF}
>     DEPENDS  MyLibrary ${DICTIONARY_HEADERS} ${DICTIONARY_LINKDEF}
>     COMMAND_EXPAND_LISTS
> )
>
> > Le mar. 6 août 2019 à 02:56, Marc CHEVRIER <marc.chevrier at gmail.com> a écrit :
> > > Oops, I mean: $<SEMICOLON> To generate a semi-colon character (I.e.  ‘;’)
> > > Le 6 août 2019 à 00:08 +0200, Unknown Unknown <mrdakeryas at gmail.com>, a écrit :
> > > > Bonjour Marc,
> > > >
> > > > Thanks for the reply! Now I get:
> > > > (add_custom_command):
> > > >   Error evaluating generator expression:
> > > >
> > > >     $<SEMILOCON>
> > > >
> > > >   Expression did not evaluate to a known generator expression
> > > >
> > > > I am really just trying to join the INTERFACE_INCLUDE_DIRECTORIES of my target with the "- I" compiler include flags... I have since noticed that I don't get a list indeed, and that:
> > > > set(DICTIONARY_INCLUDES  " -I$<JOIN:$<TARGET_PROPERTY:MyLibrary,INTERFACE_INCLUDE_DIRECTORIES>, -I>")
> > > > does the exact same thing, i.e. the Make/Ninja command is almost perfect if it were not for those backslashes coming out of nowhere at the end of each include path!
> > > >
> > > > > Le lun. 5 août 2019 à 17:26, Marc CHEVRIER <marc.chevrier at gmail.com> a écrit :
> > > > > > If you want to define a list, try to use $<SEMICOLON> rather than a space to separate the items. This way, you will get a CMake list rather than a string: list(APPEND DICTIONARY_INCLUDES "-I$<JOIN:$<TARGET_PROPERTY:MyLIBRARY,INTERFACE_INCLUDE_DIRECTORIES>,$<SEMICOLON>-I>")
> > > > > > Le 5 août 2019 à 22:56 +0200, Dakeryas <mrdakeryas at gmail.com>, a écrit :
> > > > > > > I am facing the exact same issue when when joining libraries from a target for some CMake function defined by the Cern ROOT library (ROOT_GENERATE_DICTIONARY in that case). I am defining a list: list(APPEND DICTIONARY_INCLUDES " -I$<JOIN:$<TARGET_PROPERTY:MyLIBRARY,INTERFACE_INCLUDE_DIRECTORIES>, -I>") which is then passed to the ROOT function. I can see from the build error that all the includes have a backslash appended, i.e.: ... -I/home/user/lib1/include/\ -I/home/user/lib2/include/\ -I... The BUILD_INTERFACE vs INSTALL_INTERFACE is respected, everything seems to work aside from these nasty backlashes... If I save the command manually after seeing the error and perform a string replacement to remove the backlashes, I get the desired result. Is there any fix five years later?
> > > > > > > Sent from the CMake mailing list archive at Nabble.com.
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