[Qt-creator] QtCreator C++ code parser and clang integration status

Peter Kuemmel syntheticpp at gmx.net
Wed Feb 1 12:53:34 CET 2012

> > 
> > I didn't know there is a contest :)
> It's a contest. The better solution wins. And "better" in the strictly
> practical sense. If one approach is implemented, and the other not,
> the implemented one is better.

I'm still skeptical. To often I've heard (at other places) 
"but we don't like it".

> The assumption that a clang based code model would be perfect "because
> it is a real compiler" comes up often, but is wrong.  There will always
> be "unclean" #ifdef'd blocks, bunches of .cpp that only compile when
> #include'd in a defined order, or a specific namespace, headers that are
> included multiple times with different #defines set, etc.
> Any non-trivial code base has examples for things like that.

I don't see the problem here. I only wanna see what the compiler sees.
But then you need all the build flags at parse time.

> clang won't solve that kind of problems. clang would bring in the
> remaining bits of C++, clang would bring Objective C and C++. But it
> wouldn't come for free. On the Creator side there suddenly _needs_ to be
> a way to persist code models with all the ugly problems that brings
> regarding storage, synchronisation and housekeeping. There's suddenly an
> "upstream" and the need to explain why stuff in SLOT(...) should be
> handled as function signature, and not the string literal that the
> compiler sees. The user suddenly has to use precompiled headers and
> his CPU is suddenly really busy.

Yes, I forgot all the Qt macros which are not only "macros".
For this stuff the existing parser could be used. But having
two parsers running also complicates things.

> To cut it short: There's a whole lot of cost associated with the clang
> approach beyond the pure performance issue, and I am personally very
> sceptical that this would be a net gain. On the other hand, it might
> just work. But we'll only know after someone actually implemented it...
> Andre'

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