class QString;
Q_CORE_EXPORT QString qt_error_string(int errorCode = -1);
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-Q_CORE_EXPORT void qErrnoWarning(int code, const char *msg, ...);
-Q_CORE_EXPORT void qErrnoWarning(const char *msg, ...);
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Q_CORE_EXPORT void qt_assert(const char *assertion, const char *file, int line);
#if !defined(Q_ASSERT)