We use python-config to get recommended CFLAGS. It provides -D_FORTIFY_SOURCE=2 by default that conflicts with our --enable-debug option or a developer provided no-optimization option. Hence, filter it out from default CFLAGS. Change-Id: Id80196baeb55415b1ea334e7b17143e56dfbadb3 BUG: 1283948 Co-authored-by: Kaleb S KEITHLEY <kkeithle@redhat.com> Signed-off-by: Raghavendra Talur <rtalur@redhat.com> Reviewed-on: http://review.gluster.org/12707 Smoke: Gluster Build System <jenkins@build.gluster.com> CentOS-regression: Gluster Build System <jenkins@build.gluster.com> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org> Reviewed-by: Kaleb KEITHLEY <kkeithle@redhat.com>