From 90d270f7c568e6fb0f178119cc4850318ff8a8a9 Mon Sep 17 00:00:00 2001
From: Frank Denis <github@pureftpd.org>
Date: Fri, 9 May 2014 13:23:15 -0700
Subject: [PATCH] Check for memset_s availability the hard way.

---
 configure.ac | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 3f5401b6..d56a3717 100644
--- a/configure.ac
+++ b/configure.ac
@@ -345,6 +345,17 @@ AS_CASE([$host_cpu],
      AC_DEFINE([CPU_ALIGNED_ACCESS_REQUIRED], [1], [data alignment is required])]
 )
 
+AC_MSG_CHECKING(for memset_s)
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+#include <string.h>
+]], [[
+char dummy[42];
+(void) memset_s(dummy, (rsize_t) sizeof dummy, 0, (rsize_t) sizeof dummy);
+]])],
+[AC_MSG_RESULT(yes)
+ AC_DEFINE([HAVE_MEMSET_S], [1], [memset_s is available])],
+[AC_MSG_RESULT(no)])
+
 dnl Checks for functions and headers
 
 AC_CHECK_FUNC(clock_gettime, , [AC_CHECK_LIB(rt, clock_gettime)])
@@ -352,7 +363,6 @@ AC_CHECK_FUNC(fegetenv, , [AC_CHECK_LIB(m, fegetenv)])
 
 AS_IF([test "x$EMSCRIPTEN" = "x"],[
   AC_CHECK_FUNCS([arc4random arc4random_buf])
-  AC_CHECK_FUNCS([memset_s])
 ])
 AC_CHECK_FUNCS([mlock VirtualLock])
 AC_CHECK_FUNCS([SecureZeroMemory explicit_bzero posix_memalign])