[CMake] ExternalProject_add and add_subdirectory in one step

[Petr Kmoch]

Hi Franz.

The "canonical" approach to ExternalProject is to use a "superbuild" setup.
Design your top-level CMakeList so that it *only* contains
ExternalProject_add() calls, treating your "original" project as just
another external project. Build the superbuild once, getting all the
dependencies downloaded, built, installed etc. as necessary. Then, switch
to working with only your "original" project subcomponent of the superbuild.

Petr

On Thu, Feb 5, 2015 at 5:32 PM, Franz Engel <franz.engel at apworks.de> wrote:

>  Hi,
>
>
>
> I try to clone an repository from my bare-repository and to build my
> project tree. Therefore I use the following commands:
>
>
>
> ExternalProject_Add ( demoA
>
>        PREFIX ${MAIN_PATH}/demoA
>
>        GIT_REPOSITORY ${REPOSITORY_PATH}/demoA
>
>        GIT_TAG origin/master
>
>        UPDATE_COMMAND ""
>
>        INSTALL_COMMAND "" )
>
>
>
> add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/../demoA/src/DemoA
> ${CMAKE_CURRENT_SOURCE_DIR}/demoA)
>
>
>
> Know I have the following problem. I load the Cmake-file with QtCreator.
> If I run CMake I get the error message “does not contain a CMakeLists.txt
> file”. That message is clear for me, because the repository only get loaded
> when I compile the code. The question is, if it is possible to clone the
> repo in the step of CMake. Does somebody has an idea? Or is there another
> method to build the project tree?
>
>
>
> Br,
>
>     Franz
>
> ------------------------------
>
>
> Franz Engel
>
> AIRBUS APWORKS GmbH
> 81663 Munich - Germany
> T: +49 (0) 89 607 29103
> M: +49 (0) 170 44 59 006
> franz.engel at apworks.de
>
> AIRBUS APWORKS GmbH
> Registered Office: Ottobrunn
> District Court of Munich: HRB 141734
> Managing Director: Joachim Zettler
> Internet: www.apworks.de
>
> ------------------------------
>
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