Hi Pai,
I think that there is an easier way to do this. More exactly: armadillo
should not be a target since we don't have to compile anything: we should
just be able to specify the library we need to link against and (possibly)
a path to the headers and be done.
Have you installed armadillo in a standard location? If so then you should
be able to just append
TARGET_LINK_LIBRARIES(${TARGET} armadillo)
to the end of CMakeLists.txt (after the call to PROJECT and
DEAL_II_INVOKE_AUTOPILOT)
and things should work correctly.
Thanks,
David Wells
P.S. the CMake module for setting up armadillo looks for a lot of things
that don't exist on my computer; I recommend avoiding using FIND_PACKAGE.
On Wednesday, May 16, 2018 at 2:54:39 AM UTC-4, Pai Liu wrote:
>
> Hi all,
>
> I am learning Step-8 in the tutorial. I want to use the library
> "Armadillo" (which is a library for scientific computing and linear
> algebra) together with dealii in step-8.cc.
> To compile a cpp file that only depends on the Armadillo library, one
> needs to excute the following commends at the commend line : "g++
> example.cpp -o example -O2 -larmadillo"
> So I replace "mylib" in dealii documentation about modifying
> cmakelist.txt with "armadillo", and modify the CMakeList.txt file as the
> following
>
> _____________________________________________________________________
> CMAKE_MINIMUM_REQUIRED(VERSION 2.8.12)
>
> FIND_PACKAGE(deal.II 8.5.0 REQUIRED
> HINTS ${DEAL_II_DIR} ../ ../../ $ENV{DEAL_II_DIR}
> )
> DEAL_II_INITIALIZE_CACHED_VARIABLES()
>
> PROJECT(myproject)
>
> ADD_LIBRARY(armadillo)
> DEAL_II_SETUP_TARGET(armadillo)
>
> ADD_EXECUTABLE(mycode step-8.cc)
> DEAL_II_SETUP_TARGET(mycode)
>
> TARGET_LINK_LIBRARIES(mycode armadillo)
> _____________________________________________________________________
>
> And I got the the following error:
>
> -- Using the deal.II-8.5.1 installation found at
> /home/liu/deal.ii-candi/deal.II-v8.5.1
> -- Include macro
> /home/liu/deal.ii-candi/deal.II-v8.5.1/share/deal.II/macros/macro_deal_ii_initialize_cached_variables.cmake
> -- Include macro
> /home/liu/deal.ii-candi/deal.II-v8.5.1/share/deal.II/macros/macro_deal_ii_setup_target.cmake
> -- Include macro
> /home/liu/deal.ii-candi/deal.II-v8.5.1/share/deal.II/macros/macro_deal_ii_query_git_information.cmake
> -- Include macro
> /home/liu/deal.ii-candi/deal.II-v8.5.1/share/deal.II/macros/macro_deal_ii_pickup_tests.cmake
> -- Include macro
> /home/liu/deal.ii-candi/deal.II-v8.5.1/share/deal.II/macros/macro_deal_ii_add_test.cmake
> -- Include macro
> /home/liu/deal.ii-candi/deal.II-v8.5.1/share/deal.II/macros/macro_deal_ii_invoke_autopilot.cmake
> You have called ADD_LIBRARY for library armadillo without any source
> files. This typically indicates a problem with your CMakeLists.txt file
> -- Configuring done
> CMake Error: Cannot determine link language for target "armadillo".
> CMake Error: CMake can not determine linker language for target: armadillo
> -- Generating done
> -- Build files have been written to: /home/liu/P/homogenization
>
>
>
>
>
> Can anyone help me about this issue about add library?
> Many thanks in advance!
>
>
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