[CMake] What is the purpose of INSTALL_DIR in ExternalProject_Add command?

[David Cole]

You need to tell eigen where to install, probably as an argument to its
configure step. If it builds with CMake, you can use:

    -DCMAKE_INSTALL_PREFIX=<INSTALL_DIR>

as one of the CMake args. If it has a non-CMake configure step, you'll have
to call that and pass in <INSTALL_DIR> as an argument.


HTH,
David C.


On Thursday, April 9, 2015, Cedric Doucet <cedric.doucet at inria.fr> wrote:

>
> Hello!
>
> I try to download, extract, configure, build and install a library with
> CMake.
> My CMakeLists.txt contains the following lines:
>
> cmake_minimum_required (VERSION 2.6)
> project (example CXX)
> set(CMAKE_VERBOSE_MAKEFILE ON)
> include(ExternalProject)
> include(ProcessorCount)
> ProcessorCount(N)
> if(NOT N EQUAL 0)
>   set(CMAKE_BUILD_FLAGS -j${N})
> endif()
> ExternalProject_Add(eigen
>                     PREFIX third_party
>                     DOWNLOAD_DIR third_party/eigen/download
>                     SOURCE_DIR third_party/eigen/src
>                     BINARY_DIR third_party/eigen/build
>                     INSTALL_DIR third_party/eigen/install
>                     DOWNLOAD_COMMAND wget
> http://bitbucket.org/eigen/eigen/get/3.2.4.tar.gz && tar xvzf
> 3.2.4.tar.gz -C ../src --strip-components=1
>                    )
>
> In this example, the installation step fails with the following error
> message:
>
> CMake Error at cmake_install.cmake:38 (FILE):
>   file cannot create directory: /usr/local/include/eigen3.  Maybe need
>   administrative privileges.
>
> It means that the value of INSTALL_DIR is not taken into account during
> the configuration process.
>
> Why? What am I do wrong?
>
> Thank you very much for your help.
>
> Best regards,
>
> Cédric Doucet
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