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Date:	Mon, 20 Apr 2009 00:00:35 +0300 (EEST)
From:	Markus Rinne <markus DOT rinne AT tut DOT fi>
To:	cygwin AT cygwin DOT com
Subject:	1.7: snprintf() with gcc -std=c99: warning about implicit declaration
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---1463811583-1435378703-1240174842=:3751
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Hello,

compiling C programs which use snprintf function with gcc option 
-std=c99 gives a warning about implicit declaration of snprintf.
Should snprintf be declared by including stdio.h when using C99 standard?

For example, with the following program in snprintf.c:

#include <stdio.h>

int main(void)
{
 	char buf[10];
 	snprintf(buf, 10, "%i", 0);
 	return 0;
}

Compiling with gcc-3 and gcc-4 gives these warnings:

$ gcc-3 -std=c99 snprintf.c
snprintf.c: In function `main':
snprintf.c:6: warning: implicit declaration of function `snprintf'

$ gcc-4 -std=c99 snprintf.c
snprintf.c: In function ¡main¢:
snprintf.c:6: warning: implicit declaration of function ¡snprintf¢
snprintf.c:6: warning: incompatible implicit declaration of built-in function ¡snprintf¢

Here are package versions checked with cygcheck -c:
cygwin: 1.7.0-46
gcc-core: 3.4.4-999
gcc4-core: 4.3.2-2

It seems gcc defines __STRICT_ANSI__ when passed the -std=c99 option and 
the declaration of snprintf is enclosed in
#ifndef __STRICT_ANSI__
in stdio.h.

Markus Rinne
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