From 6f74820cfc2319ebd5b52ebfbe90a7ba612923c7 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Thu, 6 May 2004 10:49:40 +0000
Subject: [PATCH] if no strerror_r prototype is found, we provide our own to
 prevent picky compilers to warn

---
 acinclude.m4   | 11 +++++++++++
 lib/strerror.c |  9 +++++++++
 2 files changed, 20 insertions(+)

diff --git a/acinclude.m4 b/acinclude.m4
index 3bfb11246..a582a4eec 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -396,6 +396,17 @@ AC_DEFUN([CURL_CHECK_STRERROR_R],
 	AC_MSG_RESULT(no))])])
 
   if test "x$strerror_r" = "xyes"; then
+
+    dnl check if strerror_r is properly declared in the headers
+    AC_CHECK_DECL(strerror_r, ,
+     AC_DEFINE(HAVE_NO_STRERROR_R_DECL, 1, [we have no strerror_r() proto])
+,
+[#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+])
+
     dnl determine if this strerror_r() is glibc or POSIX
     AC_MSG_CHECKING([for a glibc strerror_r API])
     AC_TRY_RUN([
diff --git a/lib/strerror.c b/lib/strerror.c
index 6cc87091b..d5c80d1a6 100644
--- a/lib/strerror.c
+++ b/lib/strerror.c
@@ -32,6 +32,15 @@
 #define _MPRINTF_REPLACE /* use our functions only */
 #include <curl/mprintf.h>
 
+#ifdef HAVE_NO_STRERROR_R_DECL
+#ifdef HAVE_POSIX_STRERROR_R
+/* seen on AIX 5100-02 gcc 2.9 */
+extern int strerror_r(int errnum, char *strerrbuf, size_t buflen);
+#else
+extern char *strerror_r(int errnum, char *buf, size_t buflen);
+#endif
+#endif
+
 const char *
 curl_easy_strerror(CURLcode error)
 {