[Cmake] linux cmake 1.8 INCLUDE out-of-source problem

[Zennard Sun]

Hi,
    I would like to specify helper.txt relative to my CMakeLists.txt file.
So this means that I would run:

cmake ../../src -Dfile_path:PATH=..

However, I have tried the following which should be equivalent but does not
seem to work:

cmake ../../src -Dfile_path:PATH=../../folder

Any ideas?

    Sincerely,
    Zennard Sun

Brad King wrote:

> On Tue, 30 Dec 2003, Zennard Sun wrote:
>
> > Hi,
> >     I have tested the following with SunOS and Linux setups using CMake
> > versions 1.6 and 1.8.  I only have this problem with Linux CMake version
> > 1.8 (with both 1.8.1 and 1.8.2 whereas Linux version 1.6.7 works).  I
> > have the following setup:
> >
> > folder/src
> > (where the source files are as well as CMakeLists.txt)
> >
> > folder/obj/linux
> > (the build directory where the out-of-source build goes)
> >
> > folder/helper.txt
> > (a file I want to include into my CMakeLists.txt)
> >
> > Inside folder/src/CMakeLists.txt I have the following two lines:
> >
> > SET(file_path .. CACHE PATH "Offset to file location")
> > INCLUDE(${file_path}/helper.txt)
> >
> > When I want to do an out of source build, I go to the folder/obj/linux
> > and type:
> >
> > cmake ../../src -Dfile_path:string=../..
> >
> > Since I am running an out-of-source build, I need to change the
> > file_path so it is correct from the build directory.  This used to work
> > with CMake version 1.6, however, now I get the following error:
> >
> > INCLUDE Could not find include file: ../../helper.txt
> >
> > This file does exist at the given location relative to the build
> > directory.  Any thoughts?
>
> In CMake 1.6, the INCLUDE command did not support relative paths.  The
> only reason it seemed to be working for you was because the current
> working directory when you ran CMake happened to be the right place for
> your relative path specification to work.
>
> In CMake 1.8, the INCLUDE command expands paths relative to the
> CMakeLists.txt file in which the command is processed.  Therefore when you
> specify ../.., it is looking in folder/src/../.. instead of
> folder/obj/../.. as was accidentally working in CMake 1.6 for your
> specific case.
>
> The right solution for you depends on what you're trying to do.  What is
> helper.txt?  If it is always in the same place relative to the source
> directory, then you should not need the cache entry at all.  Just use
> something like
>
>   INCLUDE(${PROJECT_SOURCE_DIR}/../helper.txt)
>
> If it is a file that can be located anywhere, then the full path should be
> specified in file_path.  Note also that the type is not needed in CMake
> 1.8 if the SET(file_path ...) command gives the cache type.  You can just
> run
>
>   cmake ../../src -Dfile_path=~/folder
>
> -Brad