[CMake] CMake and Lua

[Peter Kümmel]

James Mansion wrote:
> Ken Martin wrote:
>> other's variables out of the box. But with the Modules directory we either have to 
>> have a copy of each module for every possible scripting language, on the fly 
>> converters between any two scripting languages, or something like that to make it 
>> work. Trying to figure out how to manage the mixed
>> 
> Surely the idea is that modules should be self contained: they expose data by 
> registering it into the CMake core (possibly with callbacks) and interface to other 
> modules through the core.  Modules can be in different languages without the issue you 
> indicate (or, the modularity is poor and the binding too tight).

Yes, this is the idea. All bindings only call C++ functions of
"CMakeCore", by this we only have a n-to-one problem.

And it looks like most stuff is to pass and parse long
const char* strings, a lists with separator ";".

For instance see the SET command in cmSetCommand.cxx:
// add the definition
this->Makefile->AddDefinition(variable, value.c_str());


The problem is how to handle SET(X ${Y} z). ${Y} is a list
for cmake script but only a string for other languages.

My first idea is to introduce a list class on the C++ side,
but I assume there are already myriads of solutions to
represents lists in C++, not only std::list.

Peter