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+cm...@gmail.com> > À: cmake@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/BuildingExternalProjectsWithCMake2.8.html > > On Thu, Apr 9, 2015 at 5:44 AM, David Cole via CMake <cmake@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.dou...@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 > >> -- > >> > >> Powered by www.kitware.com > >> > >> Please keep messages on-topic and check the CMake FAQ at: > >> http://www.cmake.org/Wiki/CMake_FAQ > >> > >> Kitware offers various services to support the CMake community. For more > >> information on each offering, please visit: > >> > >> CMake Support: http://cmake.org/cmake/help/support.html > >> CMake Consulting: http://cmake.org/cmake/help/consulting.html > >> CMake Training Courses: http://cmake.org/cmake/help/training.html > >> > >> Visit other Kitware open-source projects at > >> http://www.kitware.com/opensource/opensource.html > >> > >> Follow this link to subscribe/unsubscribe: > >> http://public.kitware.com/mailman/listinfo/cmake > > > > > > -- > > > > Powered by www.kitware.com > > > > Please keep messages on-topic and check the CMake FAQ at: > > http://www.cmake.org/Wiki/CMake_FAQ > > > > Kitware offers various services to support the CMake community. For more > > information on each offering, please visit: > > > > CMake Support: http://cmake.org/cmake/help/support.html > > CMake Consulting: http://cmake.org/cmake/help/consulting.html > > CMake Training Courses: http://cmake.org/cmake/help/training.html > > > > Visit other Kitware open-source projects at > > http://www.kitware.com/opensource/opensource.html > > > > Follow this link to subscribe/unsubscribe: > > http://public.kitware.com/mailman/listinfo/cmake > -- > > Powered by www.kitware.com > > Please keep messages on-topic and check the CMake FAQ at: > http://www.cmake.org/Wiki/CMake_FAQ > > Kitware offers various services to support the CMake community. For more > information on each offering, please visit: > > CMake Support: http://cmake.org/cmake/help/support.html > CMake Consulting: http://cmake.org/cmake/help/consulting.html > CMake Training Courses: http://cmake.org/cmake/help/training.html > > Visit other Kitware open-source projects at > http://www.kitware.com/opensource/opensource.html > > Follow this link to subscribe/unsubscribe: > http://public.kitware.com/mailman/listinfo/cmake -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: http://public.kitware.com/mailman/listinfo/cmake