[cfe-dev] cling

[Daniel DeCovnick]

Very cool looking. How does it compare to ccons (http://code.google.com/p/ccons/), and any chance we could get C and Objective-C/Objective-C++ support eventually?

-Daniel

On Jul 25, 2011, at 12:28 PM, Axel Naumann wrote:

> Hi,
> 
> As we announced before
> <http://www.llvm.org/devmtg/2010-11/Naumann-Cling.pdf>, we (people from
> CERN and Fermilab) are working on the C++ interpreter(*) cling
> <http://cern.ch/cling> that's based on clang and llvm. This is in the
> context of ROOT <http://root.cern.ch> and CINT
> <http://root.cern.ch/cint>, our current C++ interpreter.
> 
> We have gotten to a stage where we believe cling is actually useful: it
> behaves like a regular interpreter!
> 
> [cling]$ #include <cmath>
> [cling]$ double x = std::sin(3.1)
> (double) 4.158066e-02
> [cling]$ .L libz
> [cling]$ #include "zlib.h"
> [cling]$ zlibVersion()
> (const char * const) "1.2.3.4"
> 
> or simply
> 
> $ echo 'extern "C" const char* zlibVersion();
> zlibVersion()' | cling -lz
> 
> (const char * const) "1.2.3.4"
> 
> and even
> 
> $ cat t.cxx
> #include "cling/Interpreter/Interpreter.h"
> void t() {
>   gCling->processLine("gCling->getVersion()");
> }
> $ cling
> [cling]$ .x t.cxx
> (const char * const) "$Id: Interpreter.cpp 40322 2011-07-21 14:20:14Z
> axel $"
> 
> We would like to know whether it's just us finding this spectacular :-)
> or whether there is general interest. Our aim is to get it included in
> the clang repository.
> 
> For us, this is just the first step; we need to integrate it into the
> rest of our software wildlife here at CERN, and we need to continue to
> work on robustness and features, e.g. reloading of code. I.e. I expect
> we will maintain and continue to develop it for years to come.
> 
> Here is the code:
> svn co http://root.cern.ch/svn/root/branches/dev/cling
> 
> Let us know what you think!
> 
> Best regards,
> the cling team (Vassil, Philippe, Paul, Lukasz and Axel).
> 
> (*) Yes, it's not an interpreter, it's really an incremental compiler
> with an interactive shell with (eventually) features like automatic
> library loading and late variable binding. But it smells like an
> interpreter :-)
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