Index: /trunk/include/iprt/assert.h
===================================================================
--- /trunk/include/iprt/assert.h	(revision 56918)
+++ /trunk/include/iprt/assert.h	(revision 56919)
@@ -99,5 +99,5 @@
  * @param   ...         Arguments to that string.
  */
-RTDECL(void)    RTAssertMsg2(const char *pszFormat, ...);
+RTDECL(void)    RTAssertMsg2(const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(1, 2);
 /**
  * Weak version of RTAssertMsg2 that forwards to RTAssertMsg2WeakV.
@@ -107,5 +107,5 @@
  * @copydoc RTAssertMsg2
  */
-RTDECL(void)    RTAssertMsg2Weak(const char *pszFormat, ...);
+RTDECL(void)    RTAssertMsg2Weak(const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(1, 2);
 
 /**
@@ -115,5 +115,5 @@
  * @param   va          Arguments to that string.
  */
-RTDECL(void)    RTAssertMsg2V(const char *pszFormat, va_list va);
+RTDECL(void)    RTAssertMsg2V(const char *pszFormat, va_list va) RT_IPRT_FORMAT_ATTR(1, 0);
 /**
  * Weak version of RTAssertMsg2V that can be overridden locally in a module to
@@ -122,5 +122,5 @@
  * @copydoc RTAssertMsg2V
  */
-RTDECL(void)    RTAssertMsg2WeakV(const char *pszFormat, va_list va);
+RTDECL(void)    RTAssertMsg2WeakV(const char *pszFormat, va_list va) RT_IPRT_FORMAT_ATTR(1, 0);
 
 /**
@@ -131,5 +131,5 @@
  * @param   ...         Arguments to that string.
  */
-RTDECL(void)    RTAssertMsg2Add(const char *pszFormat, ...);
+RTDECL(void)    RTAssertMsg2Add(const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(1, 2);
 /**
  * Weak version of RTAssertMsg2Add that forwards to RTAssertMsg2AddWeakV.
@@ -139,5 +139,5 @@
  * @copydoc RTAssertMsg2Add
  */
-RTDECL(void)    RTAssertMsg2AddWeak(const char *pszFormat, ...);
+RTDECL(void)    RTAssertMsg2AddWeak(const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(1, 2);
 
 /**
@@ -148,5 +148,5 @@
  * @param   va          Arguments to that string.
  */
-RTDECL(void)    RTAssertMsg2AddV(const char *pszFormat, va_list va);
+RTDECL(void)    RTAssertMsg2AddV(const char *pszFormat, va_list va) RT_IPRT_FORMAT_ATTR(1, 0);
 /**
  * Weak version of RTAssertMsg2AddV that can be overridden locally in a module
@@ -155,5 +155,5 @@
  * @copydoc RTAssertMsg2AddV
  */
-RTDECL(void)    RTAssertMsg2AddWeakV(const char *pszFormat, va_list va);
+RTDECL(void)    RTAssertMsg2AddWeakV(const char *pszFormat, va_list va) RT_IPRT_FORMAT_ATTR(1, 0);
 
 #ifdef IN_RING0
Index: /trunk/include/iprt/cdefs.h
===================================================================
--- /trunk/include/iprt/cdefs.h	(revision 56918)
+++ /trunk/include/iprt/cdefs.h	(revision 56919)
@@ -914,4 +914,17 @@
 # define RT_THROW(type)
 #endif
+
+/** @def RT_IPRT_FORMAT_ATTR
+ * Identifies a function taking an IPRT format string.
+ * @param   a_iFmt  The index (1-based) of the format string argument.
+ * @param   a_iArgs The index (1-based) of the first format argument, use 0 for
+ *                  va_list.
+ */
+#if defined(__GNUC__) && defined(WITH_IPRT_FORMAT_ATTRIBUTE)
+# define RT_IPRT_FORMAT_ATTR(a_iFmt, a_iArgs)   __attribute__((__iprt_format__(a_iFmt, a_iArgs)))
+#else
+# define RT_IPRT_FORMAT_ATTR(a_iFmt, a_iArgs)
+#endif
+
 
 /** @def RT_GCC_SUPPORTS_VISIBILITY_HIDDEN
Index: /trunk/include/iprt/log.h
===================================================================
--- /trunk/include/iprt/log.h	(revision 56918)
+++ /trunk/include/iprt/log.h	(revision 56919)
@@ -185,5 +185,5 @@
  * @param   ...         Optional arguments as specified in the format string.
  */
-typedef DECLCALLBACK(void) FNRTLOGGER(const char *pszFormat, ...);
+typedef DECLCALLBACK(void) FNRTLOGGER(const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(1, 2);
 /** Pointer to logger function. */
 typedef FNRTLOGGER *PFNRTLOGGER;
@@ -214,5 +214,5 @@
  * @param   ...         Optional arguments specified in the format string.
  */
-typedef DECLCALLBACK(void) FNRTLOGPHASEMSG(PRTLOGGER pLogger, const char *pszFormat, ...);
+typedef DECLCALLBACK(void) FNRTLOGPHASEMSG(PRTLOGGER pLogger, const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(2, 3);
 /** Pointer to header/footer message callback function. */
 typedef FNRTLOGPHASEMSG *PFNRTLOGPHASEMSG;
@@ -458,5 +458,6 @@
 
 
-RTDECL(void) RTLogPrintfEx(void *pvInstance, unsigned fFlags, unsigned iGroup, const char *pszFormat, ...);
+RTDECL(void) RTLogPrintfEx(void *pvInstance, unsigned fFlags, unsigned iGroup,
+                           const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(4, 5);
 
 
@@ -1703,5 +1704,6 @@
  * @remark  This is a worker function for LogRelIt.
  */
-RTDECL(void) RTLogRelLogger(PRTLOGGER pLogger, unsigned fFlags, unsigned iGroup, const char *pszFormat, ...);
+RTDECL(void) RTLogRelLogger(PRTLOGGER pLogger, unsigned fFlags, unsigned iGroup,
+                            const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(4, 5);
 
 /**
@@ -1719,5 +1721,6 @@
  * @param   args        Format arguments.
  */
-RTDECL(void) RTLogRelLoggerV(PRTLOGGER pLogger, unsigned fFlags, unsigned iGroup, const char *pszFormat, va_list args);
+RTDECL(void) RTLogRelLoggerV(PRTLOGGER pLogger, unsigned fFlags, unsigned iGroup,
+                             const char *pszFormat, va_list args) RT_IPRT_FORMAT_ATTR(4, 0);
 
 /**
@@ -1729,5 +1732,5 @@
  * @remark The API doesn't support formatting of floating point numbers at the moment.
  */
-RTDECL(void) RTLogRelPrintf(const char *pszFormat, ...);
+RTDECL(void) RTLogRelPrintf(const char *pszFormat, ...)  RT_IPRT_FORMAT_ATTR(1, 2);
 
 /**
@@ -1739,5 +1742,5 @@
  * @remark The API doesn't support formatting of floating point numbers at the moment.
  */
-RTDECL(void) RTLogRelPrintfV(const char *pszFormat, va_list args);
+RTDECL(void) RTLogRelPrintfV(const char *pszFormat, va_list args) RT_IPRT_FORMAT_ATTR(1, 0);
 
 /**
@@ -1953,5 +1956,5 @@
 RTDECL(int) RTLogCreate(PRTLOGGER *ppLogger, uint32_t fFlags, const char *pszGroupSettings,
                         const char *pszEnvVarBase, unsigned cGroups, const char * const * papszGroups,
-                        uint32_t fDestFlags, const char *pszFilenameFmt, ...);
+                        uint32_t fDestFlags, const char *pszFilenameFmt, ...) RT_IPRT_FORMAT_ATTR(8, 9);
 
 /**
@@ -1990,5 +1993,5 @@
                           uint32_t fDestFlags, PFNRTLOGPHASE pfnPhase, uint32_t cHistory,
                           uint64_t cbHistoryFileMax, uint32_t cSecsHistoryTimeSlot,
-                          char *pszErrorMsg, size_t cchErrorMsg, const char *pszFilenameFmt, ...);
+                          char *pszErrorMsg, size_t cchErrorMsg, const char *pszFilenameFmt, ...) RT_IPRT_FORMAT_ATTR(14, 15);
 
 /**
@@ -2029,5 +2032,6 @@
                            uint32_t fDestFlags, PFNRTLOGPHASE pfnPhase, uint32_t cHistory,
                            uint64_t cbHistoryFileMax, uint32_t cSecsHistoryTimeSlot,
-                           char *pszErrorMsg, size_t cchErrorMsg, const char *pszFilenameFmt, va_list args);
+                           char *pszErrorMsg, size_t cchErrorMsg,
+                           const char *pszFilenameFmt, va_list args) RT_IPRT_FORMAT_ATTR(14, 0);
 
 /**
@@ -2261,5 +2265,5 @@
  * @param   ...         Format arguments.
  */
-RTDECL(void) RTLogLogger(PRTLOGGER pLogger, void *pvCallerRet, const char *pszFormat, ...);
+RTDECL(void) RTLogLogger(PRTLOGGER pLogger, void *pvCallerRet, const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(3, 4);
 
 /**
@@ -2270,5 +2274,5 @@
  * @param   args        Format arguments.
  */
-RTDECL(void) RTLogLoggerV(PRTLOGGER pLogger, const char *pszFormat, va_list args);
+RTDECL(void) RTLogLoggerV(PRTLOGGER pLogger, const char *pszFormat, va_list args) RT_IPRT_FORMAT_ATTR(3, 0);
 
 /**
@@ -2287,5 +2291,6 @@
  * @remark  This is a worker function of LogIt.
  */
-RTDECL(void) RTLogLoggerEx(PRTLOGGER pLogger, unsigned fFlags, unsigned iGroup, const char *pszFormat, ...);
+RTDECL(void) RTLogLoggerEx(PRTLOGGER pLogger, unsigned fFlags, unsigned iGroup,
+                           const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(4, 5);
 
 /**
@@ -2303,5 +2308,6 @@
  * @param   args        Format arguments.
  */
-RTDECL(void) RTLogLoggerExV(PRTLOGGER pLogger, unsigned fFlags, unsigned iGroup, const char *pszFormat, va_list args);
+RTDECL(void) RTLogLoggerExV(PRTLOGGER pLogger, unsigned fFlags, unsigned iGroup,
+                            const char *pszFormat, va_list args) RT_IPRT_FORMAT_ATTR(4, 0);
 
 /**
@@ -2313,5 +2319,5 @@
  * @remark The API doesn't support formatting of floating point numbers at the moment.
  */
-RTDECL(void) RTLogPrintf(const char *pszFormat, ...);
+RTDECL(void) RTLogPrintf(const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(1, 2);
 
 /**
@@ -2323,5 +2329,5 @@
  * @remark The API doesn't support formatting of floating point numbers at the moment.
  */
-RTDECL(void) RTLogPrintfV(const char *pszFormat, va_list args);
+RTDECL(void) RTLogPrintfV(const char *pszFormat, va_list args)  RT_IPRT_FORMAT_ATTR(1, 0);
 
 /**
@@ -2333,5 +2339,5 @@
  * @param   va              Format arguments.
  */
-RTDECL(void) RTLogDumpPrintfV(void *pvUser, const char *pszFormat, va_list va);
+RTDECL(void) RTLogDumpPrintfV(void *pvUser, const char *pszFormat, va_list va) RT_IPRT_FORMAT_ATTR(2, 0);
 
 
@@ -2362,5 +2368,5 @@
  * @param   args        Argument list.
  */
-RTDECL(size_t) RTLogFormatV(PFNRTSTROUTPUT pfnOutput, void *pvArg, const char *pszFormat, va_list args);
+RTDECL(size_t) RTLogFormatV(PFNRTSTROUTPUT pfnOutput, void *pvArg, const char *pszFormat, va_list args) RT_IPRT_FORMAT_ATTR(3, 0);
 
 /**
@@ -2379,5 +2385,5 @@
  * @param   ...         Optional arguments specified in the format string.
  */
-RTDECL(size_t) RTLogComPrintf(const char *pszFormat, ...);
+RTDECL(size_t) RTLogComPrintf(const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(1, 2);
 
 /**
@@ -2388,5 +2394,5 @@
  * @param   args        Optional arguments specified in the format string.
  */
-RTDECL(size_t)  RTLogComPrintfV(const char *pszFormat, va_list args);
+RTDECL(size_t)  RTLogComPrintfV(const char *pszFormat, va_list args) RT_IPRT_FORMAT_ATTR(1, 0);
 
 
@@ -2498,5 +2504,5 @@
  * @param   ...         Optional arguments specified in the format string.
  */
-RTDECL(size_t) RTLogBackdoorPrintf(const char *pszFormat, ...);
+RTDECL(size_t) RTLogBackdoorPrintf(const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(1, 2);
 
 /**
@@ -2507,5 +2513,5 @@
  * @param   args        Optional arguments specified in the format string.
  */
-RTDECL(size_t)  RTLogBackdoorPrintfV(const char *pszFormat, va_list args);
+RTDECL(size_t)  RTLogBackdoorPrintfV(const char *pszFormat, va_list args) RT_IPRT_FORMAT_ATTR(1, 0);
 
 #endif /* VBOX */
Index: /trunk/include/iprt/message.h
===================================================================
--- /trunk/include/iprt/message.h	(revision 56918)
+++ /trunk/include/iprt/message.h	(revision 56919)
@@ -45,5 +45,5 @@
  * @param   ...             Format arguments.
  */
-RTDECL(int)  RTMsgSetProgName(const char *pszFormat, ...);
+RTDECL(int)  RTMsgSetProgName(const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(1, 2);
 
 /**
@@ -59,5 +59,5 @@
  * @param   ...             Format arguments.
  */
-RTDECL(int)  RTMsgError(const char *pszFormat, ...);
+RTDECL(int)  RTMsgError(const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(1, 2);
 
 /**
@@ -73,5 +73,5 @@
  * @param   va              Format arguments.
  */
-RTDECL(int)  RTMsgErrorV(const char *pszFormat, va_list va);
+RTDECL(int)  RTMsgErrorV(const char *pszFormat, va_list va) RT_IPRT_FORMAT_ATTR(1, 0);
 
 /**
@@ -84,5 +84,5 @@
  * @param   ...             Format arguments.
  */
-RTDECL(RTEXITCODE) RTMsgErrorExit(RTEXITCODE enmExitcode, const char *pszFormat, ...);
+RTDECL(RTEXITCODE) RTMsgErrorExit(RTEXITCODE enmExitcode, const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(2, 3);
 
 /**
@@ -95,5 +95,5 @@
  * @param   va              Format arguments.
  */
-RTDECL(RTEXITCODE) RTMsgErrorExitV(RTEXITCODE enmExitCode, const char *pszFormat, va_list va);
+RTDECL(RTEXITCODE) RTMsgErrorExitV(RTEXITCODE enmExitCode, const char *pszFormat, va_list va) RT_IPRT_FORMAT_ATTR(2, 0);
 
 /**
@@ -106,5 +106,5 @@
  * @param   ...             Format arguments.
  */
-RTDECL(int) RTMsgErrorRc(int rc, const char *pszFormat, ...);
+RTDECL(int) RTMsgErrorRc(int rc, const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(2, 3);
 
 /**
@@ -117,5 +117,5 @@
  * @param   va              Format arguments.
  */
-RTDECL(int) RTMsgErrorRcV(int rc, const char *pszFormat, va_list va);
+RTDECL(int) RTMsgErrorRcV(int rc, const char *pszFormat, va_list va) RT_IPRT_FORMAT_ATTR(2, 0);
 
 /**
@@ -147,5 +147,5 @@
  * @param   ...             Format arguments.
  */
-RTDECL(int)  RTMsgWarning(const char *pszFormat, ...);
+RTDECL(int)  RTMsgWarning(const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(1, 2);
 
 /**
@@ -161,5 +161,5 @@
  * @param   va              Format arguments.
  */
-RTDECL(int)  RTMsgWarningV(const char *pszFormat, va_list va);
+RTDECL(int)  RTMsgWarningV(const char *pszFormat, va_list va) RT_IPRT_FORMAT_ATTR(1, 0);
 
 /**
@@ -175,5 +175,5 @@
  * @param   ...             Format arguments.
  */
-RTDECL(int)  RTMsgInfo(const char *pszFormat, ...);
+RTDECL(int)  RTMsgInfo(const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(1, 2);
 
 /**
@@ -189,5 +189,5 @@
  * @param   va              Format arguments.
  */
-RTDECL(int)  RTMsgInfoV(const char *pszFormat, va_list va);
+RTDECL(int)  RTMsgInfoV(const char *pszFormat, va_list va) RT_IPRT_FORMAT_ATTR(1, 0);
 
 /** @} */
Index: /trunk/include/iprt/stream.h
===================================================================
--- /trunk/include/iprt/stream.h	(revision 56918)
+++ /trunk/include/iprt/stream.h	(revision 56919)
@@ -72,5 +72,6 @@
  * @param   args            Arguments to the format string.
  */
-RTR3DECL(int) RTStrmOpenFV(const char *pszMode, PRTSTREAM *ppStream, const char *pszFilenameFmt, va_list args);
+RTR3DECL(int) RTStrmOpenFV(const char *pszMode, PRTSTREAM *ppStream, const char *pszFilenameFmt,
+                           va_list args) RT_IPRT_FORMAT_ATTR(3, 0);
 
 /**
@@ -84,5 +85,5 @@
  * @param   ...             Arguments to the format string.
  */
-RTR3DECL(int) RTStrmOpenF(const char *pszMode, PRTSTREAM *ppStream, const char *pszFilenameFmt, ...);
+RTR3DECL(int) RTStrmOpenF(const char *pszMode, PRTSTREAM *ppStream, const char *pszFilenameFmt, ...) RT_IPRT_FORMAT_ATTR(3, 4);
 
 /**
@@ -275,5 +276,5 @@
  * @param   ...             Arguments specified by pszFormat.
  */
-RTR3DECL(int) RTStrmPrintf(PRTSTREAM pStream, const char *pszFormat, ...);
+RTR3DECL(int) RTStrmPrintf(PRTSTREAM pStream, const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(2, 3);
 
 /**
@@ -285,5 +286,5 @@
  * @param   args            Arguments specified by pszFormat.
  */
-RTR3DECL(int) RTStrmPrintfV(PRTSTREAM pStream, const char *pszFormat, va_list args);
+RTR3DECL(int) RTStrmPrintfV(PRTSTREAM pStream, const char *pszFormat, va_list args) RT_IPRT_FORMAT_ATTR(2, 0);
 
 /**
@@ -294,5 +295,5 @@
  * @param   va              Arguments specified by pszFormat.
  */
-RTR3DECL(void) RTStrmDumpPrintfV(void *pvUser, const char *pszFormat, va_list va);
+RTR3DECL(void) RTStrmDumpPrintfV(void *pvUser, const char *pszFormat, va_list va) RT_IPRT_FORMAT_ATTR(2, 0);
 
 /**
@@ -303,5 +304,5 @@
  * @param   ...             Arguments specified by pszFormat.
  */
-RTR3DECL(int) RTPrintf(const char *pszFormat, ...);
+RTR3DECL(int) RTPrintf(const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(1, 2);
 
 /**
@@ -312,5 +313,5 @@
  * @param   args            Arguments specified by pszFormat.
  */
-RTR3DECL(int) RTPrintfV(const char *pszFormat, va_list args);
+RTR3DECL(int) RTPrintfV(const char *pszFormat, va_list args) RT_IPRT_FORMAT_ATTR(1, 0);
 
 /** @} */
Index: /trunk/include/iprt/string.h
===================================================================
--- /trunk/include/iprt/string.h	(revision 56918)
+++ /trunk/include/iprt/string.h	(revision 56919)
@@ -1727,5 +1727,6 @@
  * @param   InArgs      Argument list.
  */
-RTDECL(size_t) RTStrFormatV(PFNRTSTROUTPUT pfnOutput, void *pvArgOutput, PFNSTRFORMAT pfnFormat, void *pvArgFormat, const char *pszFormat, va_list InArgs);
+RTDECL(size_t) RTStrFormatV(PFNRTSTROUTPUT pfnOutput, void *pvArgOutput, PFNSTRFORMAT pfnFormat, void *pvArgFormat,
+                            const char *pszFormat, va_list InArgs) RT_IPRT_FORMAT_ATTR(5, 0);
 
 /**
@@ -1744,5 +1745,6 @@
  * @param   ...         Argument list.
  */
-RTDECL(size_t) RTStrFormat(PFNRTSTROUTPUT pfnOutput, void *pvArgOutput, PFNSTRFORMAT pfnFormat, void *pvArgFormat, const char *pszFormat, ...);
+RTDECL(size_t) RTStrFormat(PFNRTSTROUTPUT pfnOutput, void *pvArgOutput, PFNSTRFORMAT pfnFormat, void *pvArgFormat,
+                           const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(5, 6);
 
 /**
@@ -1757,5 +1759,6 @@
  * @param   fFlags          Flags, RTSTR_F_XXX.
  */
-RTDECL(int) RTStrFormatNumber(char *psz, uint64_t u64Value, unsigned int uiBase, signed int cchWidth, signed int cchPrecision, unsigned int fFlags);
+RTDECL(int) RTStrFormatNumber(char *psz, uint64_t u64Value, unsigned int uiBase, signed int cchWidth, signed int cchPrecision,
+                              unsigned int fFlags);
 
 /**
@@ -1962,5 +1965,5 @@
  * @param   ...         The format argument.
  */
-RTDECL(size_t) RTStrPrintf(char *pszBuffer, size_t cchBuffer, const char *pszFormat, ...);
+RTDECL(size_t) RTStrPrintf(char *pszBuffer, size_t cchBuffer, const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(3, 4);
 
 
@@ -1977,5 +1980,6 @@
  * @param   args        The format argument.
  */
-RTDECL(size_t) RTStrPrintfExV(PFNSTRFORMAT pfnFormat, void *pvArg, char *pszBuffer, size_t cchBuffer, const char *pszFormat, va_list args);
+RTDECL(size_t) RTStrPrintfExV(PFNSTRFORMAT pfnFormat, void *pvArg, char *pszBuffer, size_t cchBuffer,
+                              const char *pszFormat, va_list args)  RT_IPRT_FORMAT_ATTR(5, 0);
 
 /**
@@ -1991,5 +1995,6 @@
  * @param   ...         The format argument.
  */
-RTDECL(size_t) RTStrPrintfEx(PFNSTRFORMAT pfnFormat, void *pvArg, char *pszBuffer, size_t cchBuffer, const char *pszFormat, ...);
+RTDECL(size_t) RTStrPrintfEx(PFNSTRFORMAT pfnFormat, void *pvArg, char *pszBuffer, size_t cchBuffer,
+                             const char *pszFormat, ...)  RT_IPRT_FORMAT_ATTR(5, 6);
 
 
@@ -2021,5 +2026,5 @@
  * @param   pszTag      Allocation tag used for statistics and such.
  */
-RTDECL(int) RTStrAPrintfVTag(char **ppszBuffer, const char *pszFormat, va_list args, const char *pszTag);
+RTDECL(int) RTStrAPrintfVTag(char **ppszBuffer, const char *pszFormat, va_list args, const char *pszTag) RT_IPRT_FORMAT_ATTR(2, 0);
 
 /**
@@ -2035,5 +2040,5 @@
  * @param   ...         The format argument.
  */
-DECLINLINE(int) RTStrAPrintf(char **ppszBuffer, const char *pszFormat, ...)
+DECLINLINE(int) RTStrAPrintf(char **ppszBuffer, const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(2, 3)
 {
     int     cbRet;
@@ -2058,5 +2063,5 @@
  * @param   ...         The format argument.
  */
-DECLINLINE(int) RTStrAPrintfTag(char **ppszBuffer, const char *pszTag, const char *pszFormat, ...)
+DECLINLINE(int) RTStrAPrintfTag(char **ppszBuffer, const char *pszTag, const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(3, 4)
 {
     int     cbRet;
@@ -2087,5 +2092,5 @@
  * @param   pszTag      Allocation tag used for statistics and such.
  */
-RTDECL(char *) RTStrAPrintf2VTag(const char *pszFormat, va_list args, const char *pszTag);
+RTDECL(char *) RTStrAPrintf2VTag(const char *pszFormat, va_list args, const char *pszTag) RT_IPRT_FORMAT_ATTR(1, 0);
 
 /**
@@ -2097,5 +2102,5 @@
  * @param   ...         The format argument.
  */
-DECLINLINE(char *) RTStrAPrintf2(const char *pszFormat, ...)
+DECLINLINE(char *) RTStrAPrintf2(const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(1, 2)
 {
     char   *pszRet;
@@ -2116,5 +2121,5 @@
  * @param   ...         The format argument.
  */
-DECLINLINE(char *) RTStrAPrintf2Tag(const char *pszTag, const char *pszFormat, ...)
+DECLINLINE(char *) RTStrAPrintf2Tag(const char *pszTag, const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(2, 3)
 {
     char   *pszRet;