configure: Do not use 'sed -i'

'sed -i' is not defined in POSIX. It doesn't work on Mac OS X the way
it's used in configure (without suffix argument). This patch implements
Peter Maydell's idea of xattr.h detection.

Cc: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Pavel Borzenkov <pavel.borzenkov@gmail.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

diff --git a/configure b/configure
index 8d85d23..6c77fbb 100755 (executable)
--- a/configure
+++ b/configure
@@ -1963,13 +1963,17 @@ if test "$attr" != "no" ; then
   cat > $TMPC <<EOF
 #include <stdio.h>
 #include <sys/types.h>
+#ifdef CONFIG_LIBATTR
+#include <attr/xattr.h>
+#else
 #include <sys/xattr.h>
+#endif
 int main(void) { getxattr(NULL, NULL, NULL, 0); setxattr(NULL, NULL, NULL, 0, 0); return 0; }
 EOF
   if compile_prog "" "" ; then
     attr=yes
   # Older distros have <attr/xattr.h>, and need -lattr:
-  elif sed -i s,sys/xattr,attr/xattr, $TMPC && compile_prog "" "-lattr" ; then
+  elif compile_prog "-DCONFIG_LIBATTR" "-lattr" ; then
     attr=yes
     LIBS="-lattr $LIBS"
     libattr=yes