[CMake] RPATH for pkg-config

[Franck Houssen]

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) 

foreach(dir ${PETSc_LIBRARY_DIRS}) 
link_directories(main PUBLIC ${dir}) # Not sure: is this needed ? 
endforeach(dir) 
# use, i.e. don't skip the full RPATH for the build tree 
SET(CMAKE_SKIP_BUILD_RPATH FALSE) 
# when building, don't use the install RPATH already 
# (but later on when installing) 
SET(CMAKE_BUILD_WITH_INSTALL_RPATH FALSE) 
SET(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/lib") 
# add the automatically determined parts of the RPATH 
# which point to directories outside the build tree to the install RPATH 
SET(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE) 
# the RPATH to be used when installing, but only if it's not a system directory 
LIST(FIND CMAKE_PLATFORM_IMPLICIT_LINK_DIRECTORIES "${CMAKE_INSTALL_PREFIX}/lib" isSystemDir) 
IF("${isSystemDir}" STREQUAL "-1") 
SET(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/lib") 
ENDIF("${isSystemDir}" STREQUAL "-1") 

include(CTest) 
enable_testing() 
add_test(NAME main COMMAND "mpirun -n 2 ./main" WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}") 

Now, 

>> export PKG_CONFIG_PATH="/path/to/petsc/local/lib/pkgconfig" 
>> cmake ..; make => OK 

But 

>> ldd main 
linux-vdso.so.1 (0x00007ffcf23ca000) 
libmpi_cxx.so.20 => /usr/lib/x86_64-linux-gnu/libmpi_cxx.so.20 (0x00007f68593ea000) 
libmpi.so.20 => /usr/lib/x86_64-linux-gnu/libmpi.so.20 (0x00007f68590f4000) 
libpetsc.so.3.8 => not found 

and so, make test fails ?!... 

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