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-rw-r--r--src/corelib/global/qlogging.cpp4
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}