C99 functions in stdio.h hidden when using gcc with -std=c99

[Markus Rinne]

Hi,

The C99 functions snprintf, vfscanf, vscanf, vsnprintf and vsscanf are not 
declared in stdio.h when using gcc -std=c99.  Gcc gives this kind of 
warning:
foo.c:6: warning: implicit declaration of function Β‘snprintfΒ’
This is because the function declarations are enclosed in
#ifndef __STRICT_ANSI__ .

Related discussion can be found on the cygwin mailing list:
http://cygwin.com/ml/cygwin/2009-04/msg00435.html

Here is a patch to use
#if !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901L
instead.


Index: newlib/libc/include/stdio.h
===================================================================
RCS file: /cvs/src/src/newlib/libc/include/stdio.h,v
retrieving revision 1.57
diff -u -r1.57 stdio.h
--- newlib/libc/include/stdio.h 4 Apr 2009 15:44:19 -0000       1.57
+++ newlib/libc/include/stdio.h 2 May 2009 14:49:46 -0000
@@ -232,6 +232,20 @@
  int    _EXFUN(remove, (const char *));
  int    _EXFUN(rename, (const char *, const char *));
  #endif
+#if !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901L
+#ifndef _REENT_ONLY
+int    _EXFUN(snprintf, (char *, size_t, const char *, ...)
+               _ATTRIBUTE ((__format__ (__printf__, 3, 4))));
+int    _EXFUN(vfscanf, (FILE *, const char *, __VALIST)
+               _ATTRIBUTE ((__format__ (__scanf__, 2, 0))));
+int    _EXFUN(vscanf, (const char *, __VALIST)
+               _ATTRIBUTE ((__format__ (__scanf__, 1, 0))));
+int    _EXFUN(vsnprintf, (char *, size_t, const char *, __VALIST)
+               _ATTRIBUTE ((__format__ (__printf__, 3, 0))));
+int    _EXFUN(vsscanf, (const char *, const char *, __VALIST)
+               _ATTRIBUTE ((__format__ (__scanf__, 2, 0))));
+#endif
+#endif
  #ifndef __STRICT_ANSI__
  #ifdef _COMPILING_NEWLIB
  int    _EXFUN(fseeko, (FILE *, _off_t, int));
@@ -266,8 +280,6 @@
                 _ATTRIBUTE ((__format__ (__printf__, 2, 3))));
  int    _EXFUN(siscanf, (const char *, const char *, ...)
                 _ATTRIBUTE ((__format__ (__scanf__, 2, 3))));
-int    _EXFUN(snprintf, (char *, size_t, const char *, ...)
-               _ATTRIBUTE ((__format__ (__printf__, 3, 4))));
  int    _EXFUN(sniprintf, (char *, size_t, const char *, ...)
                 _ATTRIBUTE ((__format__ (__printf__, 3, 4))));
  char * _EXFUN(tempnam, (const char *, const char *));
@@ -285,24 +297,16 @@
                 _ATTRIBUTE ((__format__ (__printf__, 2, 0))));
  int    _EXFUN(vfiscanf, (FILE *, const char *, __VALIST)
                 _ATTRIBUTE ((__format__ (__scanf__, 2, 0))));
-int    _EXFUN(vfscanf, (FILE *, const char *, __VALIST)
-               _ATTRIBUTE ((__format__ (__scanf__, 2, 0))));
  int    _EXFUN(viprintf, (const char *, __VALIST)
                 _ATTRIBUTE ((__format__ (__printf__, 1, 0))));
  int    _EXFUN(viscanf, (const char *, __VALIST)
                 _ATTRIBUTE ((__format__ (__scanf__, 1, 0))));
-int    _EXFUN(vscanf, (const char *, __VALIST)
-               _ATTRIBUTE ((__format__ (__scanf__, 1, 0))));
  int    _EXFUN(vsiprintf, (char *, const char *, __VALIST)
                 _ATTRIBUTE ((__format__ (__printf__, 2, 0))));
  int    _EXFUN(vsiscanf, (const char *, const char *, __VALIST)
                 _ATTRIBUTE ((__format__ (__scanf__, 2, 0))));
  int    _EXFUN(vsniprintf, (char *, size_t, const char *, __VALIST)
                 _ATTRIBUTE ((__format__ (__printf__, 3, 0))));
-int    _EXFUN(vsnprintf, (char *, size_t, const char *, __VALIST)
-               _ATTRIBUTE ((__format__ (__printf__, 3, 0))));
-int    _EXFUN(vsscanf, (const char *, const char *, __VALIST)
-               _ATTRIBUTE ((__format__ (__scanf__, 2, 0))));
  #endif /* !_REENT_ONLY */
  #endif /* !__STRICT_ANSI__ */