[petsc-users] cmake, pkg-config and Libs.private

[Jed Brown]

Please check out these resources.

https://cmake.org/cmake/help/latest/module/FindPkgConfig.html
https://gitlab.com/petsc/petsc/-/merge_requests/2367

Yann Jobic <yann.jobic at univ-amu.fr> writes:

> Hi all,
>
> I solved my problem, but i don't know if it's the right way to do it. 
> Libs.private is used in case of static linking. So I added:
> execute_process ( COMMAND pkg-config PETSc --libs --static 
> OUTPUT_VARIABLE STATIC_LIBS)
> string(STRIP ${STATIC_LIBS} STATIC_LIBS)
> message("Libs static : " ${STATIC_LIBS})
>
> And it works. Is it the right way to do it ?
>
> Thanks,
>
> Best regards,
>
> Yann
>
>
> Le 11/03/2020 à 11:59, Yann Jobic a écrit :
>> Hi all,
>> 
>> I'm trying to create a correct CMakeLists.txt in order to compile a 
>> petsc program.
>> I can compile my code, but i cannot link it.
>> 
>> I have this link command :
>> /local/lib/openmpi/gcc8/4.0.3/bin/mpicc -g  -rdynamic 
>> CMakeFiles/Test1.dir/src/dvm_dg1D_qff_2dV.c.o 
>> CMakeFiles/Test1.dir/src/computeHermCoeff.c.o 
>> CMakeFiles/Test1.dir/src/dg1DFuncs.c.o  -o Test1 
>> -L/local/lib/petsc/3.12/p4/gcc_8.3.1/openmpi-gcc-opti/lib -lpetscts 
>> -lpetscsnes -lpetscksp -lpetscdm -lpetscmat -lpetscvec -lpetscsys
>> /bin/ld: 
>> /local/lib/petsc/3.12/p4/gcc_8.3.1/openmpi-gcc-opti/lib/libpetscsys.a(dlimpl.o): 
>> référence au symbole non défini « dlclose@@GLIBC_2.2.5 »
>> //usr/lib64/libdl.so.2 : erreur lors de l'ajout de symboles : DSO 
>> manquant dans la ligne de commande
>> 
>> But if i add Libs.private to this line in a terminal to test the 
>> command, it works:
>> mpicc   -rdynamic CMakeFiles/Test1.dir/src/dvm_dg1D_qff_2dV.c.o 
>> CMakeFiles/Test1.dir/src/computeHermCoeff.c.o 
>> CMakeFiles/Test1.dir/src/dg1DFuncs.c.o  -o Test1 
>> -L/local/lib/petsc/3.12/p4/gcc_8.3.1/openmpi-gcc-opti/lib -lpetscts 
>> -lpetscsnes -lpetscksp -lpetscdm -lpetscmat -lpetscvec -lpetscsys 
>> -L/local/lib/petsc/3.12/p4/gcc_8.3.1/openmpi-gcc-opti/lib 
>> -L/local/lib/openmpi/gcc8/4.0.3/lib -L/usr/lib/gcc/x86_64-redhat-linux/8 
>> -lHYPRE -lcmumps -ldmumps -lsmumps -lzmumps -lmumps_common -lpord 
>> -lscalapack -lumfpack -lklu -lcholmod -lbtf -lccolamd -lcolamd -lcamd 
>> -lamd -lsuitesparseconfig -lsuperlu -lsuperlu_dist -lml -lp4est -lsc 
>> -lflapack -lfblas -lptesmumps -lptscotchparmetis -lptscotch 
>> -lptscotcherr -lesmumps -lscotch -lscotcherr -lnetcdf -lhdf5hl_fortran 
>> -lhdf5_fortran -lhdf5_hl -lhdf5 -lparmetis -lmetis -ltriangle -lm -lz 
>> -lsz -lX11 -lstdc++ -ldl -lmpi_usempif08 -lmpi_usempi_ignore_tkr 
>> -lmpi_mpifh -lmpi -lgfortran -lm -lgfortran -lm -lgcc_s -lquadmath 
>> -lpthread -lrt -lquadmath -lstdc++ -ldl
>> 
>> So I should be using Libs.private in the link command, but i don't know 
>> how to tell cmake to do so.
>> 
>> What is the correct line that i have to add to CMakeLists.txt in order 
>> to have Libs and Libs.private from the PETSc.pc file ?
>> What I am doing wrong ?
>> 
>> Thanks,
>> 
>> Best regards,
>> 
>> Yann
>> 
>> PS : My CMakeLists.txt so far :
>> cmake_minimum_required(VERSION 2.8.11)
>> 
>> list (APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake-modules)
>> 
>> set(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)
>> 
>> # set root of location to find PETSc configuration
>> set(PETSC $ENV{PETSC_DIR}/$ENV{PETSC_ARCH})
>> set(ENV{PKG_CONFIG_PATH} ${PETSC}/lib/pkgconfig)
>> 
>> # Determine PETSc compilers
>> execute_process ( COMMAND pkg-config PETSc --variable=ccompiler COMMAND 
>> tr -d '\n' OUTPUT_VARIABLE C_COMPILER)
>> SET(CMAKE_C_COMPILER ${C_COMPILER})
>>    execute_process ( COMMAND pkg-config PETSc --variable=cxxcompiler 
>> COMMAND tr -d '\n' OUTPUT_VARIABLE CXX_COMPILER)
>> if (CXX_COMPILER)
>>    SET(CMAKE_CXX_COMPILER ${CXX_COMPILER})
>> endif (CXX_COMPILER)
>> execute_process ( COMMAND pkg-config PETSc --variable=fcompiler COMMAND 
>> tr -d '\n' OUTPUT_VARIABLE FORTRAN_COMPILER)
>> if (FORTRAN_COMPILER)
>>    SET(CMAKE_Fortran_COMPILER ${FORTRAN_COMPILER})
>>    enable_language(Fortran)
>> endif (FORTRAN_COMPILER)
>> 
>> find_package(PkgConfig REQUIRED)
>> pkg_search_module(PETSC REQUIRED PETSc)
>> 
>> set(SOURCES src/dvm_dg1D_qff_2dV.c src/computeHermCoeff.c src/dg1DFuncs.c)
>> include_directories(${PETSC_INCLUDE_DIRS})
>> include_directories(includes)
>> 
>> add_executable(Test1 ${SOURCES})
>> target_link_libraries(Test1 ${PETSC_LDFLAGS})