[CMake] Include directory issue ... -I are not separated?

[Eric Noulard]

2012/6/20 Ateljevich, Eli <eli at water.ca.gov>:
> Hi everone. I am getting a funny include flag and I wonder if anyone can help. The project is in Fortran (though I don't think this matters) and the structure can be distilled to:
>
> /myproj
>   /build
>   /src
>      /Hydro
>
> I do the build in /build in linux using "cmake -DCMAKE_Fortran_COMPILER  ../src".
>
> The /src and /src/Hydro CMakeLists.txt are given below and I try to include and link to the external netcdf library which is where I say it is -- I use the same envvar in a GNU makefile system. The library includes are actually needed in only the third file sflux_9c.F90, and it is on this file that the build fails:
>
> cd /home/myproj_cmake/build/Hydro && /usr/local/dms/pkg/openmpi/1.4.3-intel12.0/bin/mpif90  -o CMakeFiles/Hydro.dir/sflux_9c.F90.o  -I/home/myproj_cmake/src/Hydro/-I/usr/local/dms/pkg/netcdf/4.1.3-intel12.0-parallel/include   -c /home/myproj_cmake/src/Hydro/sflux_9c.F90
>
> Could it be because the two -I includes are glued together? Come to think of it, I did nothing to request the  -I/home/myproj_cmake/src/Hydro/ part though I don't object to it. Can someone explain what I am doing wrong or give me a workaround?

I think you misuse some CMake directive, keep reading...

>
> Very grateful,
> Eli
>
> ========= /src
> cmake_minimum_required (VERSION 2.6)
> project(MYPROJ)
> enable_language (Fortran)
>
> # Recurse into module libraries
> add_subdirectory( Hydro )
>
> ========= /src/Hydro
> add_library(Hydro file1.F90 file2.F90 sflux_9c.F90)
>
>
> # Make sure the compiler can find include files from our Hydro library.
> include_directories ( $(NETCDF_INC) )
>
> # Make sure the linker can find the Hydro library once it is built.
> link_directories ( ${SELFE_BINARY_DIR}/Hydro )

This previous one is wrong, link_directories is seldom used for your
own library.
The forthcoming
target_link_libraries (mymain Hydro)
is enough for CMake to find how to link "mymain" to "Hydro" lib.

Try removing this "link_directories" line.

> add_executable ( mymain mymain.F90 )
>
> # Link the executable to the Hydro library.
> target_link_libraries (mymain Hydro $(NETCDF_INC) )

This statement looks wrong as well
NETCDF_INC must a path to an include directory not a path
to a library?
What you probably need is
target_link_libraries (mymain Hydro $(NETCDF_LIBRARY) )

with NETCDF_LIBRARY being the full path to the NETCDF library.

-- 
Erk
Le gouvernement représentatif n'est pas la démocratie --
http://www.le-message.org