My best guess is that somewhere there is a

#define Status int

somewhere in your code, which is then conflicting with the enum value
"Status = 3", which is being converted to "int = 3" by the preprocessor.

You may need to undef it before including Eigen.

On Tue, Apr 20, 2021 at 10:48 PM Rob McDonald <[email protected]>
wrote:

> I'm trying 3.4 rc1 on my program.  Everything seems to work fine on
> Windows and MacOS.  However, there seems to be some sort of conflict when I
> try to build on Linux.
>
> We are currently using 3.3.7 and everything works fine.  I suppose I could
> try 3.3.9 if that would be helpful.
>
> The problems only crop up in the graphics part of my program (which does
> not use Eigen intensively, it just gets included relatively incidentally).
> My program can also be compiled in a non-graphical version (no GUI, OpenGL,
> or XWindows libraries allowed at all) - and that works fine.  I use FLTK as
> a cross-platform GUI library.  The most significant difference on Linux is
> the use of X Windows.
>
> I've attached the gcc error log from trying to compile one file -- sorry,
> it is 884 lines long...
>
> My gut says something is getting #defined that then gives Eigen fits.
> However, I can't find anything that looks wrong in the code the messages
> are pointing to.
>
> Any help tracking this down will be very much appreciated.
>
> Rob
>
>
>
>
>

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