build: Fix autoconf warnings

This patch avoids the following warnings on running autogen script

. . .
Running autoconf...
configure.ac:896: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in
body
../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
configure.ac:896: the top level
. . .

This change uses AC_LINK_IFELSE for checking the atomic built-in function
support. Since AC_COMPILE_IFELSE checks for syntactical errors only, we need
to use AC_LINK_IFELSE to achieve the same which is more appropriate.

Reference links:
[1] https://autotools.io/forwardporting/autoconf.html
[2] http://www.gnu.org/software/autoconf/manual/autoconf.html#Generating-Sources
[3] http://www.gnu.org/software/autoconf/manual/autoconf.html#Running-the-Compiler

Change-Id: I4597f2976623496745b66f98bb78a0c9f1b07f79
BUG: 1198849
Signed-off-by: Anoop C S <anoopcs@redhat.com>
Reviewed-on: http://review.gluster.org/12351
Tested-by: NetBSD Build System <jenkins@build.gluster.org>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Niels de Vos <ndevos@redhat.com>

0 files changed, 0 insertions, 0 deletions