cling/README.md

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Linux: [![Linux Status](http://img.shields.io/travis/vgvassilev/cling.svg?style=flat-square)](https://travis-ci.org/vgvassilev/cling)  


##DESCRIPTION
Cling is an interactive C++ interpreter, built on top of Clang and LLVM compiler infrastructure. Cling realizes the read-print-evaluate-loop concept, in order to leverage rapid application development. Implemented as a small extension to LLVM and Clang, the interpreter reuses their strengths such as the praised concise and expressive compiler diagnostics.

### Further information & demos
  Please note that some of the resources are rather old and most of the stated limitations are outdated.
  * https://github.com/vgvassilev/cling/tree/master/www/docs/talks
  * http://blog.coldflake.com/posts/2012-08-09-On-the-fly-C++.html
  * http://solarianprogrammer.com/2012/08/14/cling-cpp-11-interpreter/
  * https://www.youtube.com/watch?v=f9Xfh8pv3Fs
  * https://www.youtube.com/watch?v=BrjV1ZgYbbA
  * https://www.youtube.com/watch?v=wZZdDhf2wDw
  * https://www.youtube.com/watch?v=eoIuqLNvzFs

##INSTALLATION
###Binaries
  We offer binary snapshots for download at https://ecsft.cern.ch/dist/cling

###Source
  CLING source depends on the [LLVM][1] and [CLANG][2] headers and libraries.
You will also need [CMake][3] >= 2.6.1 or GNU Make to build all of those
packages and [subversion][4] and [git][5] to get the source code.

   [1]: http://llvm.org
   [2]: http://clang.llvm.org
   [3]: http://cmake.org
   [4]: http://subversion.tigris.org
   [5]: http://git-scm.com

####Building
  Building LLVM and CLANG you must:
   * Check out the sources:
```bash
    git clone http://root.cern.ch/git/llvm.git src
    cd src
    git checkout cling-patches
    cd tools
    git clone http://root.cern.ch/git/cling.git
    git clone http://root.cern.ch/git/clang.git
    cd clang
    git checkout cling-patches
```
   * Configure, build and install them, either using CMake:

```bash
    cd ..
    mkdir build
    cd build
    cmake -DCMAKE_INSTALL_PREFIX=/some/install/dir \
          -DLLVM_TARGETS_TO_BUILD=CBackend\;CppBackend\;X86 \
          -DCMAKE_BUILD_TYPE=Debug \
          ../src
    make
    make install
```
   * or GNU Make (see ../src/configure --help for all options):

```bash
    cd ..
    mkdir build
    cd build
    ../src/configure --prefix=/some/install/dir
    make
    make install
```
#####Cling Packaging Tool
Cling's tree has a user-friendly, command-line utility written in Python called
Cling Packaging Tool (CPT) which can build Cling from source and generate
installer bundles for a wide range of platforms.

If you have Cling's source cloned locally, you can find the tool in
```tools/packaging``` directory. Alternatively, you can download the script
manually, or by using ```wget```:
```sh
wget https://raw.githubusercontent.com/vgvassilev/cling/master/tools/packaging/cpt.py
chmod +x cpt.py
```

Full documentation of CPT can be found in [tools/packaging](https://github.com/vgvassilev/cling/tree/master/tools/packaging).

##USAGE
   `/some/install/dir/bin/cling '#include <stdio.h>' 'printf("Hello World!\n")'`
   To get started run: `/some/install/dir/bin/cling --help`
   or type
   `/some/install/dir/bin/cling`
   `[cling]$ .help`

##DEVELOPERS' CORNER:
   We have doxygen documentation of cling's code at: http://cling.web.cern.ch/cling/doxygen/
###CONTRIBUTIONS
  Every contribution is very welcome. It is considered as a donation and its copyright and any other related
rights become exclusive ownership of the person who merged the code or in any other case the main developers.
  In order for a contribution to be accepted it has to obey the previously
established rules for contribution acceptance in cling's work flow and rules.