Re: [eigen] Eigen Needs Forward Declaration Files

[Brad Bell <bradbell@xxxxxxxxxx>]

On 1/9/2016 6:08 AM, Marc Glisse wrote:
> On Sat, 9 Jan 2016, Brad Bell wrote:
>
> > The standard library file
> >    # include <iosfwd>
> > is a forward declarations file for the objects defined in <iostream>.
> >
> > I have a need of such a file for the object
> >    class Eigen::SimplicialLDLT;
> > Here is my reason.
> >
> > Compiling with eigen and g++ requires one to suppress certain 
> > warnings as follows:
> >     -Wno-shadow -Wno-deprecated-declarations
>
> Why not advertise the directory with Eigen sources using -isystem 
> instead of -I? That's how many projects handle warnings in external 
> dependencies.
I was able to do this in a compiler independent way with the CMake 
SYSTEM option to the INCLUDE_DIRECTORIES command. I Think that this 
satisfies my needs for a forward declaration.

Thanks.