In case like ticket FS-7214 very helpful compile FS without optimization.
When I add flags CFLAGS and CXXFLAGS like below compilation is breaks. Addiding option "--disable-optimization" for configure script is help me.

export CFLAGS="$CFLAGS -O0"
export CXXFLAGS="$CXXFLAGS -O0"


make[4]: Entering directory `/home/build/rpmbuild/BUILD/freeswitch-1.4.13/src/mod/languages/mod_python'
  CC       mod_python_la-mod_python.lo
In file included from /usr/include/limits.h:26:0,
                 from /usr/lib/gcc/x86_64-redhat-linux/4.8.2/include/limits.h:168,
                 from /usr/lib/gcc/x86_64-redhat-linux/4.8.2/include/syslimits.h:7,
                 from /usr/lib/gcc/x86_64-redhat-linux/4.8.2/include/limits.h:34,
                 from /usr/include/python2.7/Python.h:19,
                 from mod_python.c:35:
/usr/include/features.h:330:4: error: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Werror=cpp]
 #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)


Can you suggest correct way to compile FS without optimization?