[Cmake] CMake error output improvments

[Marco Petrone]

Have the features added by Fabien been imported in some CMake release? I 
also discovered the CMake output in case of errors is really poor... I 
have a project with dozens of cmake files including one each other and 
discovering the real position of an error located in sub-included file 
can become a real nightmare (if you don't do something like what Fabien 
suggests)...

Marco

>
> One of the patch that i think is simple and efficient IMHO is to add 
> the parameters of the error line,
> so as an example: instead of looking what SET line is buggy you 
> immediately locate it.
>
> Here the modif (add one line):
>
> File cmMakefile.cxx, Line230, replace:
>       error = usedCommand->GetName();
>       error += ": Error :";
>       error += usedCommand->GetError();
>       ...
> By:
>       error = usedCommand->GetName();
>       error += ": Error :";
>       error += (expandedArguments.front()+" ...\n");
>       error += usedCommand->GetError();
>       ...
>
> Enjoy!
>
>
> Regards,
> Fabien.
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