[CMake] RPATH for pkg-config

Thu Jan 4 10:52:53 EST 2018

On Thu, Jan 4, 2018 at 3:57 AM Franck Houssen <franck.houssen at inria.fr>
wrote:

> ------------------------------
>
> *De: *"Don Hinton" <hintonda at gmail.com>
> *À: *"Franck Houssen" <franck.houssen at inria.fr>
> *Cc: *"Andreas Naumann" <Andreas-Naumann at gmx.net>, cmake at cmake.org
> *Envoyé: *Jeudi 4 Janvier 2018 10:43:28
>
>
> *Objet: *Re: [CMake] RPATH for pkg-config
>
> The cmake rpath settings handle build/install directories more or less
> automatically, but you need to add a completely different path.
>
>
> Yes. That's the problem: I need to add a completely different path.
>
>
> Try adding the additional path (pretty much every -L you added) to
> CMAKE_INSTALL_RPATH, and set CMAKE_BUILD_WITH_INSTALL_RPATH=TRUE.
>
>
> See does not work
>
> >> more ../CMakeLists.txt
> ...
>
> foreach(dir ${PETSc_LIBRARY_DIRS})
>   link_directories(main PUBLIC ${dir})
>   message("link_directories - dir is ${dir}")
>   set(CMAKE_INSTALL_RPATH "${dir}:${CMAKE_INSTALL_RPATH}")
> endforeach(dir)
>

s/:/;/

You need to use a semicolon instead is a colon as a cmake list separator.

> ...
> SET(CMAKE_BUILD_WITH_INSTALL_RPATH TRUE)
> ...
>
> >> cmake ..; make VERBOSE=1
> ...
> target_link_libraries - lib is
> -L/home/fghoussen/Documents/INRIA/petsc/local/lib
> target_link_libraries - lib is -lpetsc
> link_directories - dir is /home/fghoussen/Documents/INRIA/petsc/local/lib
> ...
> [ 50%] Building CXX object CMakeFiles/main.dir/main.cpp.o
> /usr/bin/c++   -I/usr/lib/x86_64-linux-gnu/openmpi/include/openmpi
> -I/usr/lib/x86_64-linux-gnu/openmpi/include/openmpi/opal/mca/event/libevent2022/libevent
> -I/usr/lib/x86_64-linux-gnu/openmpi/include/openmpi/opal/mca/event/libevent2022/libevent/include
> -I/usr/lib/x86_64-linux-gnu/openmpi/include
> -I/home/fghoussen/Documents/INRIA/petsc/local/include   -o
> CMakeFiles/main.dir/main.cpp.o -c
> /home/fghoussen/Downloads/cmake/rpath-pkgconfig/main.cpp
> [100%] Linking CXX executable main
> /usr/bin/cmake -E cmake_link_script CMakeFiles/main.dir/link.txt
> --verbose=1
> /usr/bin/c++     CMakeFiles/main.dir/main.cpp.o  -o main
> -Wl,-rpath,/usr/lib/x86_64-linux-gnu/openmpi/lib
> /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi_cxx.so
> /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so
> -L/home/fghoussen/Documents/INRIA/petsc/local/lib -lpetsc
> make[2]: Leaving directory
> '/home/fghoussen/Downloads/cmake/rpath-pkgconfig/BUILD'
> [100%] Built target main
> make[1]: Leaving directory
> '/home/fghoussen/Downloads/cmake/rpath-pkgconfig/BUILD'
> /usr/bin/cmake -E cmake_progress_start
> /home/fghoussen/Downloads/cmake/rpath-pkgconfig/BUILD/CMakeFiles 0
>
> >> ldd main
>     linux-vdso.so.1 (0x00007ffcd876b000)
>     libmpi_cxx.so.20 => /usr/lib/x86_64-linux-gnu/libmpi_cxx.so.20
> (0x00007f9eaba1f000)
>     libmpi.so.20 => /usr/lib/x86_64-linux-gnu/libmpi.so.20
> (0x00007f9eab729000)
>     libpetsc.so.3.8 => not found
>
>
> Then run cmake with the ‘-v’ option and look at the link command to verify
> rpath was passed correctly.
>
> You can also examine it in a library or executable with ‘objdump-x’.
>
> You may want to customize this for your project, but this should get you
> started.
>
> hth...
> don
>
> On Thu, Jan 4, 2018 at 1:25 AM Franck Houssen <franck.houssen at inria.fr>
> wrote:
>
>> My understanding is that you need a local copy of FindPETSc.cmake: if
>> this changes, you don't know it.
>> That's why I tried to go with the pc file.
>>
>> ----- Mail original -----
>> > De: "Andreas Naumann" <Andreas-Naumann at gmx.net>
>> > À: cmake at cmake.org
>> > Envoyé: Mercredi 3 Janvier 2018 21:41:51
>> > Objet: Re: [CMake] RPATH for pkg-config
>> >
>> > What about using a FindPETSC-Module? Some hints are
>> >      *http://jacobmerson.com/2016/01/17/cmake-petsc2.html
>> >      *http://www.mcs.anl.gov/petsc/documentation/faq.html#cmake
>> >
>> > Regards,
>> > Andreas
>> >
>> > Am 03.01.2018 um 21:35 schrieb Alexander Neundorf:
>> > > On 2018 M01 3, Wed 10:08:09 CET Franck Houssen wrote:
>> > >> Hello,
>> > >>
>> > >> How to ask cmake to add a library path (coming from pc file) to
>> rpath ?
>> > >>
>> > >> I checked this https://cmake.org/Wiki/CMake_RPATH_handling, but
>> still not
>> > >> working. Can somebody help ?
>> > >>>> more main.cpp
>> > >> #include <petsc.h>
>> > >>
>> > >> int main(int argc, char ** argv) {
>> > >> PetscInitialize(&argc, &argv, NULL, "");
>> > >> PetscFinalize();
>> > >> return 0;
>> > >> }
>> > >>
>> > >>>> more CMakeLists.txt
>> > >> cmake_minimum_required(VERSION 3.7)
>> > >> enable_language(CXX)
>> > >>
>> > >> find_package(MPI REQUIRED)
>> > >> find_package(PkgConfig REQUIRED) # Get pkg_check_modules.
>> > >> pkg_check_modules(PETSc REQUIRED PETSc)
>> > >>
>> > >> project(main)
>> > >> add_executable(main main.cpp)
>> > >>
>> > >> target_include_directories(main PUBLIC ${MPI_CXX_INCLUDE_PATH})
>> > >> target_link_libraries(main PUBLIC ${MPI_CXX_LIBRARIES})
>> > >>
>> > >> target_include_directories(main PUBLIC ${PETSc_INCLUDE_DIRS})
>> > >> foreach(lib ${PETSc_LDFLAGS})
>> > >> target_link_libraries(main PUBLIC ${lib})
>> > >> endforeach(lib)
>> > > How does each ${lib} look like ?
>> > > Is it "-lpetsc" or does it have the full path to the libraries ?
>> > > You should use the full path to the libraries, otherwise cmake
>> doesn't know
>> > > where they are and the RPATH computation will not work.
>> > >
>> > >> foreach(dir ${PETSc_LIBRARY_DIRS})
>> > >> link_directories(main PUBLIC ${dir}) # Not sure: is this needed ?
>> > >> endforeach(dir)
>> > > no, link_directories() in general should not be used.
>> > >
>> > >> # use, i.e. don't skip the full RPATH for the build tree
>> > >> SET(CMAKE_SKIP_BUILD_RPATH FALSE)
>> > >> # when building, don't use the install RPATH already
>> > >> # (but later on when installing)
>> > >> SET(CMAKE_BUILD_WITH_INSTALL_RPATH FALSE)
>> > >> SET(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/lib")
>> > > If the automatic computation fails, you could add the petsc lib dir
>> here as
>> > > INSTALL_RPATH
>> > >
>> > > Alex
>> > >
>> >
>> > --
>> >
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>> >
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