[CMake] ExternalProject and hardwired "src" directory

[Theodore Papadopoulo]

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On 03/11/2013 01:06 PM, Luc J. Bourhis wrote:
> Ansis Māliņš wrote
> 
> The problem is that I have more than a dozen targets added with 
> ExternalProject_Add. How would I factor out such a change in one
> place and one place only?


Use a function like:

function(SetExternalProjectsDirs prefix varname)

    set(DIR_VAR_NAMES DOWNLOAD BINARY STAMP INSTALL TMP)
    set(DIR_NAMES     ""       build  stamp install tmp)

    set(dirs PREFIX ${prefix})
    foreach(i RANGE 4)
        list(GET DIR_VAR_NAMES ${i} var)
        list(GET DIR_NAMES     ${i} dir)

        set(dirs ${dirs} ${var}_DIR ${prefix}/${dir})
    endforeach()

    if (NOT ${USE_LOCAL_SOURCES})
        set(dirs ${dirs} SOURCE_DIR ${prefix}/src)
    endif()

    set(${varname} ${dirs} PARENT_SCOPE)
endfunction()


SetExternalProjectsDirs(MyProject dirs)
ExternalProject_Add(MyProject
                    ${dirs}
		    ....)


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