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
