08a9274c02
Implicitly generated members from a CXXRecordDecls coming from a PCH should not be unloaded. CodeGen 'records' that it once emitted the implicit members and if they get unloaded it would be out of sync. The key difference is the information about all the implicitly generated members (trivial ctors/dtors, etc) comes from an ASTMutationListener and they are not part of the transaction. We still do not record it as a part of the transaction, we just mark them as used so that they don't get unloaded from the llvm::Module. Once the list of llvm.used decls is emitted we need to clear it, otherwise we end up emitting one and the same thing over and over. Fixes ROOT-6722 Tests should be coming shortly.
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##DESCRIPTION Cling is an interactive C++ interpreter, built on top of Clang and LLVM compiler infrastructure. Cling realizes the read-eval-print loop (REPL) 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Please note that some of the resources are rather old and most of the stated limitations are outdated.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 and CLANG headers and libraries. You will also need CMake >= 2.6.1 or GNU Make to build all of those packages and subversion and git to get the source code.
####Building Building LLVM and CLANG you must:
- Check out the sources:
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:
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):
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:
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.
##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.