Re: IDE

[Dmitry Gutov]

On 10/12/2015 05:08 PM, Oleh Krehel wrote:

> Thanks for mentioning that. I wasn't sure that was the case.

It's basically MIT license, see 
https://directory.fsf.org/wiki/Atom#tab=Details.

> CEDET already resolves these complicated chains pretty well, as long as
> it's got the correct AST.

Semantic has some known issues in this general area, exactly because 
it's hard. Clang, on the other hand, resolves them well.

> > What if `bar' is declared as `auto' (see C++11)? Or `app' itself?
>
> This would be harder, but still very doable, even within CEDET.

You mean something would have to implement that. Good luck.

Another possible complication is using function templates in that method 
call chain.

> 1. Finding where the relevant headers are located on the file
> system. This means that the AST parser should hook into the currently
> used build system, and correctly see which #ifdef switches apply where.
> Only GCC or its likes have access to this info always. To reiterate, if
> the program compiles with GCC, the exact same switches must be passed to
> the AST parser, so that it parses exactly the same headers in exactly
> the same way.

This is non-trivial, because the switches are usually constructed by the 
build tool at run time. But see:

https://github.com/Sarcasm/irony-mode#compilation-database

> 2. Parsing the newly introduced language features. Here CEDET and
> cc-mode are behind because of the shear complexity of the full C++
> syntax. However, GCC does it very well.

Note that any CEDET feature that handles target type resolution is also 
subject to having to deal with new C++ language features.

> I've been working on function-args.el to extend CEDET C++ support for my
> uses for around 2 years now. The most common error that I have to work
> around is "Type definition not found", which happens either because the
> header path wasn't resolved, or the wrong #ifdef path was taken.

It could simply mean that until things work well on this level, you're 
not going to pay attention to the more subtle problems.