cmake_minimum_required(VERSION 3.5.0)

set(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)

# set root of location to find PETSc's pkg-config
set(PETSC $ENV{PETSC_DIR}/$ENV{PETSC_ARCH})
set(ENV{PKG_CONFIG_PATH} ${PETSC}/lib/pkgconfig)

# Remove the lines below if you do not wish to have PETSc determine the 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)

#  tells CMake to build the application ex1 from the source file ex1.c
#  this must appear AFTER the compilers are set
project(main)
add_executable(main main.c)

find_package(PkgConfig REQUIRED)
pkg_search_module(PETSC REQUIRED IMPORTED_TARGET PETSc)
target_link_libraries(main PkgConfig::PETSC)