Hide non-standard itoa/utoa() in stdlib.h or drop these functions?

[Christian Franke]

The functions itoa() and utoa() are non-standard, not exported by Cygwin 
and also unavailable on FreeBSD and Linux (glibc and musl libc). Busybox 
for example could not be build OOTB using newlib's stdlib.h because 
there are conflicts with local functions with same names but different 
signatures.

See the original posts on the Cygwin list for more details:
https://sourceware.org/pipermail/cygwin/2024-January/255216.html
https://sourceware.org/pipermail/cygwin/2024-January/255217.html

Corinna proposed to either drop these functions entirely or hide the 
prototypes on Cygwin only. I attached a patch for the second alternative.

-- 
Regards,
Christian

-------------- next part --------------
From 5f1c43796c6a125f04c1f2436fc1048783ce3b7a Mon Sep 17 00:00:00 2001
From: Christian Franke <christian.franke@t-online.de>
Date: Mon, 22 Jan 2024 19:11:20 +0100
Subject: [PATCH] Hide itoa, utoa, __itoa and __utoa in stdlib.h on Cygwin only

These functions are non-standard and not exported by Cygwin.

Signed-off-by: Christian Franke <christian.franke@t-online.de>
---
 newlib/libc/include/stdlib.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/newlib/libc/include/stdlib.h b/newlib/libc/include/stdlib.h
index 15b349440..fd89f5ba7 100644
--- a/newlib/libc/include/stdlib.h
+++ b/newlib/libc/include/stdlib.h
@@ -221,11 +221,13 @@ char *	ecvtbuf (double, int, int*, int*, char *);
 char *	fcvtbuf (double, int, int*, int*, char *);
 char *	ecvtf (float,int,int *,int *);
 #endif
+#ifndef __CYGWIN__
 char *	__itoa (int, char *, int);
 char *	__utoa (unsigned, char *, int);
-#if __MISC_VISIBLE
+# if __MISC_VISIBLE
 char *	itoa (int, char *, int);
 char *	utoa (unsigned, char *, int);
+# endif
 #endif
 #if __POSIX_VISIBLE
 int	rand_r (unsigned *__seed);
-- 
2.43.0