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author | Tor Arne Vestbø <tor.arne.vestbo@qt.io> | 2018-01-03 16:50:08 +0100 |
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committer | Tor Arne Vestbø <tor.arne.vestbo@qt.io> | 2018-01-12 11:50:35 +0000 |
commit | 84e7b6409042b269c89dff2187f563027e379ec0 (patch) | |
tree | 7a8a06fa3dc8f7a6ac39049e8c2661de4e5fad0a | |
parent | b14934547a1828ba37009ef6803ab0ba419b690e (diff) |
logging: Clarify that QT_MESSAGE_PATTERN only applies to unstructured logging
Structured sinks such as systemd should capture each piece of information
individually, not bake it into the message via the message pattern.
Change-Id: I164c043683f123764a5445dc9faad049e25fd738
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
-rw-r--r-- | src/corelib/global/qlogging.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/corelib/global/qlogging.cpp b/src/corelib/global/qlogging.cpp index 0861763492..2bacdbb77c 100644 --- a/src/corelib/global/qlogging.cpp +++ b/src/corelib/global/qlogging.cpp @@ -1886,6 +1886,10 @@ void qErrnoWarning(int code, const char *msg, ...) environment variable; if both \l qSetMessagePattern() is called and QT_MESSAGE_PATTERN is set, the environment variable takes precedence. + \note The message pattern only applies to unstructured logging, such as the default + \c stderr output. Structured logging such as systemd will record the message as is, + along with as much structured information as can be captured. + Custom message handlers can use qFormatLogMessage() to take \a pattern into account. \sa qInstallMessageHandler(), {Debugging Techniques}, {QLoggingCategory} |