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

Thu Apr 9 07:26:01 EDT 2015

It's for if your use case requires the project to be installed in a
specific location that's not the automatically generated one. For instance,
if you're building multiple external projects you might have them all
install to the same subdirectory of the binary directory for convenience.

Ryan

On Thu, Apr 9, 2015, 6:07 AM Cedric Doucet <cedric.doucet at inria.fr> wrote:

>
> Hello Iosif and David,
>
> thank you for your answer.
> I now understand how it works.
> But I still don't understand the purpose of INSTALL_DIR.
> Do you know an example when this variable is useful?
>
> Cédric
>
>
>
>
> ----- Mail original -----
> > De: "Iosif Neitzke" <iosif.neitzke+cmake at gmail.com>
> > À: cmake at cmake.org
> > Envoyé: Jeudi 9 Avril 2015 12:54:28
> > Objet: Re: [CMake] What is the purpose of INSTALL_DIR in
> ExternalProject_Add command?
> >
> > Install Step
> > The INSTALL_DIR is underneath the calling project’s binary directory.
> > Use INSTALL_DIR to specify a different location. Note that in addition
> > to setting INSTALL_DIR, you also have to pass -DCMAKE_INSTALL_PREFIX
> > or --prefix to the CMake or configure command. It is not used
> > automatically in the configure step since not all projects follow this
> > convention.
> >
> > From
> > http://www.kitware.com/media/html/BuildingExternalProjectsWithCM
> ake2.8.html
> >
> > On Thu, Apr 9, 2015 at 5:44 AM, David Cole via CMake <cmake at cmake.org>
> wrote:
> > > 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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> > >>
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>
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>
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> information on each offering, please visit:
>
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