Qt Creator Clang Code Model: Difference between revisions

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[[Category:Tools::QtCreator]]
Documentation: http://doc.qt.io/qtcreator/creator-clang-codemodel.html
Documentation: http://doc.qt.io/qtcreator/creator-clang-codemodel.html


== Debugging ==
== Debugging ==


[http://doc.qt.io/qt-5/qloggingcategory.html QLoggingCategory] is used for debugging output. With the following invocation debugging output will be generated:
With the following invocation debugging output will be generated:


Linux/Mac:
Linux/Mac:
  $ QT_LOGGING_RULES=qtc.clang*=true ./qtcreator
  export QT_LOGGING_RULES=qtc.clang*=true
./qtcreator


Windows (start [https://technet.microsoft.com/en-us/sysinternals/debugview.aspx DebugView] in advance to see the output):
Windows (start [https://technet.microsoft.com/en-us/sysinternals/debugview.aspx DebugView] in advance to see the output):
  $ set QT_LOGGING_RULES=qtc.clang*=true
  set QT_LOGGING_RULES=qtc.clang*=true
  $ qtcreator.exe
  qtcreator.exe


=== Internal command line ===
This will create way too much output. But since the lines are prefixed with the rule that generated them, you can easily adapt your settings to what you are actually interested in.
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:
=== Compiler command lines for the code model context ===
# Open Menu: Tools > Options > C++ > Tab: Code Model
The file <build dir>/.qtc_clangd/compile_commands.json contains the exact command lines that clangd uses to parse the files in the project.
# Copy some warning configuration by clicking on "Copy...", give it a name like "Debug"
# Replace all the options from the copied configuration with "-###"
# 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 ==
=== Run time related ===
* QTC_CLANG_USE_TOOLCHAIN_MACROS - Uses also the toolchain macros for code model
* QTC_CLANG_CMD_OPTIONS_BLACKLIST - Semicolon sepparated list of compiler command line options not to be passed to code model
 
== clangd ==
clangd is used via the language server protocol to provide code model features
 
=== Builds ===
Linux and Mac:
 
libclang is built with the same compilers as Qt Creator ("Clang 7.0 (Apple)" for macOS, and GCC 5.3 from RHEL (which turns on old ABI compatibility with _GLIBCXX_USE_CXX11_ABI=0 by default) on Linux)
 
Windows:
 
Currently libclang is built with optimized MinGW compiler for all Qt Creator versions. More information about Windows builds: [[Build libclang on Windows]]

Latest revision as of 14:27, 20 May 2022

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
./qtcreator

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

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

This will create way too much output. But since the lines are prefixed with the rule that generated them, you can easily adapt your settings to what you are actually interested in.

Compiler command lines for the code model context

The file <build dir>/.qtc_clangd/compile_commands.json contains the exact command lines that clangd uses to parse the files in the project.

Related Environment Variables

Run time related

  • QTC_CLANG_USE_TOOLCHAIN_MACROS - Uses also the toolchain macros for code model
  • QTC_CLANG_CMD_OPTIONS_BLACKLIST - Semicolon sepparated list of compiler command line options not to be passed to code model

clangd

clangd is used via the language server protocol to provide code model features

Builds

Linux and Mac:

libclang is built with the same compilers as Qt Creator ("Clang 7.0 (Apple)" for macOS, and GCC 5.3 from RHEL (which turns on old ABI compatibility with _GLIBCXX_USE_CXX11_ABI=0 by default) on Linux)

Windows:

Currently libclang is built with optimized MinGW compiler for all Qt Creator versions. More information about Windows builds: Build libclang on Windows

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