[CMake] findpackage.cmake vs packageconfig.cmake

[Michael Wild]

On 10. Aug, 2010, at 16:20 , Mathieu Malaterre wrote:

> Hi there,
> 
>  I am trying to find a solution to find the openjpeg package.
> 
>  In the 1.x version, openjpeg uses a makefile based build system. In
> this case I need to write a custom findopenjpeg.cmake file to discover
> all required path.
> 
>  However in the current 2.x version, openjpeg now uses cmake as build
> system. In this case I need to search for the installed
> openjpeg-config.cmake.
> 
>  I did not find a solution to cope with both situations. As soon as I
> provide a findopenjpeg.cmake in the cmake_module_path, I cannot search
> for openjpeg-config.cmake anymore.
> 
> Any hints or suggestion greatly appreciated,
> -- 
> Mathieu

1: search for OpenJPEG without FindOpenJPEG.cmake (making sure that FindOpenJPEG.cmake is not on your CMAKE_MODULE_PATH)

2: if not found, either:
  a: Directly include() the FindOpenJPEG.cmake file.
  b: set the CMAKE_MODULE_PATH and retry.

I'd go with 2a (VTK and ParaView use this method extensively to provide custom FindXXX modules for older CMake versions)...

HTH

Michael