[CMake] Question about dependencies for install (FILES...)

[Christoph Cullmann]

Hi,

I try to install a flex generated file: (lex.loopmap_.cpp)

CMakeLists.txt excerpt:

set (cfg_cfiles_install
        files
        conmap.cpp
        loopmap.cpp
        regmap.cpp
        mapping.cpp
        lex.loopmap_.cpp
        paggdl.cpp
        scc.cpp
        sort.cpp
        sort_exp.cpp
)

# install some source files
install(FILES ${cfg_cfiles_install} DESTINATION ${CFGDIR_C})

# targets to refresh the scanner
ADD_CUSTOM_COMMAND(
    OUTPUT "lex.loopmap_.cpp"
    COMMAND flex ARGS -8 -Ploopmap_ -olex.loopmap_.cpp map.lex
    DEPENDS "map.lex"
    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})


But CMake doesn't call flex and fails at install.
How do I tell it the dependency to generate the file on demand if not there or 
the .lex was changed?

Greetings
Christoph

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