https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=a8891c932192eaf2b19f14958ccc662d37ec7236
commit a8891c932192eaf2b19f14958ccc662d37ec7236
Author: Corinna Vinschen <cori...@vinschen.de>
AuthorDate: Tue Mar 4 23:26:15 2025 +0100
Commit: Corinna Vinschen <cori...@vinschen.de>
CommitDate: Tue Mar 4 23:29:07 2025 +0100
Cygwin: stdlib.h: resurrect arc4random_stir() definition
An autoconf test for arc4random_stir() succeeds on Cygwin, because
we export the symbol for backward compatibility. However, when
building with -Werror afterwards, the definition of arc4random_stir()
is missing in the stdlib.h header, so there's a chance to encounter
an error like this with newer GCC:
sshd.c:1113:25: error: implicit declaration of function ‘arc4random_stir’;
did you mean ‘arc4random_buf’? [-Wimplicit-function-declaration]
1113 | arc4random_stir();
| ^~~~~~~~~~~~~~~
| arc4random_buf
This occurs for instance when building OpenSSH 9.9p2 with GCC 15.0.
Define arc4random_stir() as an empty macro in cygwin/stdlib.h
to avoid the above compiler warning.
Do not define arc4random_addrandom() yet, in the hope that this function
call is really, really not used anymore.
Fixes: 1cca343e4714 ("Drop redundant arc4random prototypes from
cygwin/stdlib.h")
Signed-off-by: Corinna Vinschen <cori...@vinschen.de>
Diff:
---
winsup/cygwin/include/cygwin/stdlib.h | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/winsup/cygwin/include/cygwin/stdlib.h
b/winsup/cygwin/include/cygwin/stdlib.h
index dd1077b51d2b..6191e549021f 100644
--- a/winsup/cygwin/include/cygwin/stdlib.h
+++ b/winsup/cygwin/include/cygwin/stdlib.h
@@ -20,6 +20,11 @@ extern "C"
const char *getprogname (void);
void setprogname (const char *);
+#if __BSD_VISIBLE
+/* Cygwin exports arc4random_stir() for backward compatibility. Define
+ here as empty macro to avoid compiler warnings. */
+#define arc4random_stir()
+#endif
#if __GNU_VISIBLE
char *canonicalize_file_name (const char *);
#endif
