Qt Creator Clang Code Model

Documentation: http://doc.qt.io/qtcreator/creator-clang-codemodel.html

Debugging

With the following invocation debugging output will be generated:

Linux/Mac:

export QT_LOGGING_RULES=qtc.clang*=true
export LIBCLANG_TIMING=1
./qtcreator

Windows (start DebugView in advance to see the output):

set QT_LOGGING_RULES=qtc.clang*=true
set LIBCLANG_TIMING=1
qtcreator.exe

The debugging output contains among others:

• The IPC messages send/received
• Output of libclang while parsing

Internal command line

The debugging output from above will contain all the command line options that are passed on to libclang, which is enough for most cases.

However, to see also the resulting internal command line of libclang run:

1. Switch to projects mode and there to the "Clang Code Model"
2. Copy some warning configuration by clicking on "Copy...", give it a name like "Debug"
3. Replace all the options from the copied configuration with "-###"
4. Close and re-open the editor document - the new debugging output will contain also the internal command line

Note that libclang/clangbackend will crash afterwards, so do not forget to switch back to a sane warning configuration.

Related Environment Variables

Build related

• QTC_NO_CLANG_LIBTOOLING - Do not build against Clang's C++ libs; the ClangRefactoring plugin won't be build.

Run time related

• LIBCLANG_TIMING - Timings from libclang for parse / reparse / preamble generation / completion.
• QTC_CLANG_NO_SUPPORTIVE_TRANSLATIONUNIT - Use only one translation unit per document.
• QTC_CLANG_NO_ALIVE_TIMER - Simplifies debugging in certain cases.
• QTC_CLANG_FORCE_VERBOSE_ALIVE - Simplifies debugging in certain cases.