Add gcc format-string checking.

src/libCom/Makefile

@@ -165,6 +165,7 @@ INC += osiWireFormat.h
 INC += epicsReadline.h
 INC += epicsMessageQueue.h
 INC += epicsStdio.h
+INC += compilerDefs.h
 
 INC += devLib.h
 

src/libCom/error/errlog.h

@@ -15,6 +15,7 @@
 #include <stdarg.h>
 
 #include "shareLib.h"
+#include "compilerDefs.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -39,11 +40,11 @@ epicsShareExtern char * errlogSevEnumString[];
 #endif
 
 epicsShareFunc int errlogPrintf(
-    const char *pformat, ...);
+    const char *pformat, ...) EPICS_PRINTF_STYLE(1,2);
 epicsShareFunc int errlogVprintf(
     const char *pformat,va_list pvar);
 epicsShareFunc int errlogSevPrintf(
-    const errlogSevEnum severity,const char *pformat, ...);
+    const errlogSevEnum severity,const char *pformat, ...) EPICS_PRINTF_STYLE(2,3);
 epicsShareFunc int errlogSevVprintf(
     const errlogSevEnum severity,const char *pformat,va_list pvar);
 epicsShareFunc int epicsShareAPI errlogMessage(
@@ -66,7 +67,7 @@ epicsShareFunc void epicsShareAPI errlogFlush(void);
 
 /*other routines that write to log file*/
 epicsShareFunc void errPrintf(long status, const char *pFileName,
-    int lineno, const char *pformat, ...);
+    int lineno, const char *pformat, ...) EPICS_PRINTF_STYLE(4,5);
 
 epicsShareExtern int errVerbose;
 
@@ -74,7 +75,7 @@ epicsShareExtern int errVerbose;
  * the message to appear twice on the console
  */
 epicsShareFunc int errlogPrintfNoConsole(
-    const char *pformat, ...);
+    const char *pformat, ...) EPICS_PRINTF_STYLE(1,2);
 epicsShareFunc int errlogVprintfNoConsole(
     const char *pformat,va_list pvar);
 

src/libCom/osi/epicsStdio.h

@@ -15,13 +15,14 @@
 #include <stdarg.h>
 
 #include "shareLib.h"
+#include "compilerDefs.h"
 
 #ifdef  __cplusplus
 extern "C" {
 #endif
 
 epicsShareFunc int epicsShareAPI epicsSnprintf(
-    char *str, size_t size, const char *format, ...);
+    char *str, size_t size, const char *format, ...) EPICS_PRINTF_STYLE(3,4);
 epicsShareFunc int epicsShareAPI epicsVsnprintf(
     char *str, size_t size, const char *format, va_list ap);
 epicsShareFunc FILE * epicsShareAPI epicsTempFile ( void );

src/libCom/osi/os/default/compilerDefs.h

@@ -0,0 +1,21 @@
+/*************************************************************************\
+* Copyright (c) 2003 The University of Chicago, as Operator of Argonne
+*     National Laboratory.
+* EPICS BASE Versions 3.13.7
+* and higher are distributed subject to a Software License Agreement found
+* in file LICENSE that is included with this distribution. 
+\*************************************************************************/
+#ifndef _EPICS_COMPILERDEFS_H
+#define _EPICS_COMPILERDEFS_H
+
+/*
+ * Compiler-specific definitions
+ */
+
+#ifdef __GNUC__
+# define EPICS_PRINTF_STYLE(f,a) __attribute__((format(printf,f,a)))
+#else
+# define EPICS_PRINTF_STYLE(f,a)
+#endif
+
+#endif /* _EPICS_COMPILERDEFS_H */