Make sys-openat test conditional upon the existence of AT_FDCWD.
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13171 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/configure.in b/configure.in
index 31e0815..0adec58 100644
--- a/configure.in
+++ b/configure.in
@@ -997,6 +997,27 @@
# Checking for various library functions and other definitions
#----------------------------------------------------------------------------
+# Check for AT_FDCWD
+
+AC_MSG_CHECKING([for AT_FDCWD])
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+#define _GNU_SOURCE
+#include <fcntl.h>
+#include <unistd.h>
+]], [[
+ int a = AT_FDCWD;
+]])], [
+ac_have_at_fdcwd=yes
+AC_MSG_RESULT([yes])
+], [
+ac_have_at_fdcwd=no
+ac_gcc_have_dfp_type=no
+AC_MSG_RESULT([no])
+])
+
+AM_CONDITIONAL([HAVE_AT_FDCWD], [test x$ac_have_at_fdcwd = xyes])
+
+
# Check for CLOCK_MONOTONIC
AC_MSG_CHECKING([for CLOCK_MONOTONIC])