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README.md: Add/correct instructions for building perfparser

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Change-Id: I7dbdc9a34fb3297957cdb93a6f042c4fb6282eea
Reviewed-by: hjk <hjk@qt.io>
This commit is contained in:
Eike Ziller
2022-12-16 10:40:42 +01:00
parent 1eb73e4eb3
commit 994626d1f6
1 changed files with 14 additions and 8 deletions
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@@ -157,15 +157,21 @@ like Qt and LLVM, additionally run
cmake --install . --prefix /path/to/qtcreator_install --component Dependencies
### Performance Analyzer
### Perf Profiler Support
If you have not installed Qt with the Maintenance Tool, you must
either set the path to the `perfparser` executable as a value of
the `PERFPROFILER_PARSER_FILEPATH` environment variable or copy
the executable to from the Qt Creator installation directory to
the build directory. That is, copy it from
`/path/to/qtcreator_install/Tools/QtCreator/libexec/qtcreator/` to
/path/to/qtcreator_buid/libexec/qtcreator/`.
Support for the [perf](https://perf.wiki.kernel.org/index.php/Main_Page) profiler
requires the `perfparser` tool that is part of the Qt Creator source package, and also
part of the Qt Creator Git repository in form of a submodule in `src/tools/perfparser`.
Compilation of `perfparser` requires ELF and DWARF development packages.
You can either download and extract a prebuilt package from
https://download.qt.io/development_releases/prebuilt/elfutils/ and add the
directory to the `CMAKE_PREFIX_PATH` when configuring Qt Creator,
or install the `libdw-dev` package on Debian-style Linux systems.
You can also point Qt Creator to a separate installation of `perfparser` by
setting the `PERFPROFILER_PARSER_FILEPATH` environment variable to the full
path to the executable.
## Getting LLVM/Clang for the Clang Code Model