[CMake] Include file in the Makefile

[Hom Nath Gharti]

Thanks, Mike!

HNG

On Thu, Mar 23, 2017 at 12:59 PM, Michael Ellery <mellery451 at gmail.com> wrote:
>
>> On Mar 22, 2017, at 2:07 PM, Hom Nath Gharti <hng.email at gmail.com> wrote:
>>
>> Dear all,
>>
>> I use PETSc in my package and I need to use the following line in my
>> GNU Makefile:
>>
>> include ${PETSC_DIR}/lib/petsc/conf/variables
>>
>> What is the equivalent command for CMakeLists.txt for this?
>>
>> Thanks for your help.
>>
>> Thanks,
>> HNG
>> --
>
> The typical way to use an installed library is via find_package, which requires either a pkgspec or a find module. It looks like someone has already written a find module:
>
> https://github.com/jedbrown/cmake-modules/blob/master/FindPETSc.cmake
>
> so, you can do something like:
>
> * fork/or submodule this repo above
> * append to CMAKE_MODULE_PATH in your CMakeLists.txt file to add the path to this module above.
> * call find_package(PETSc)
> * use the variables that are documented in the finder to set your include_directories and target_link_libraries.
>
> If you are certain the env variable PETSC_DIR is always going to be set (as above), then you can simply build paths based on that variable and pass them to include_directories and target_link_libraries, but the finders also do a better job of dealing with various build environments, etc.
>
> HTH,
> Mike Ellery